EXPLORING THE EARTH
Issue 6 //
Topic of the Issue //
January 2018
Case Studies Special
ISSN 2367-847X www.coringmagazine.com
Explorat ion
21 Questions // Professor Nenkov - Mining and Geological University, Sofia, Bulgaria
Product Reviews // Eirik Borg’s AziDrillTM, made by Aziwell The TwinGyroTM from Inertial Sensing
In Focus // Energold Drilling Corp. Experts in Man-Portable Drilling Operations
More Inside // Features on drill rigs, diamond bits and drilling fluids
D ia mond
D r i l l i ng
United. Inspired.
Ready for the future.
Discover what Epiroc can do for you. Epiroc was formed to be a stronger partner for you in mining, infrastructure and natural resources. By building on proven Atlas Copco expertise, you can count on us to deliver the performance you need today and the technology to lead tomorrow. Mining | Infrastructure | Natural resources
/EDITORIAL
Dear Readers I’m proud to announce the publication of our sixth edition. Increasing numbers of you are getting in touch to sign up as subscribers and contributors, and for this I thank you: with your input the magazine continues to go from strength to strength. In fact, we received twice as many articles for this issue as compared to Issue 5. And it’s the same story with advertising requests. These positive developments would not have been possible without the great professionalism of our editor, Simone Hutchinson and our marketing manager, Melanie Clay. Thank you, both! In this issue we present an exclusive interview with inventor and highly respected drilling specialist, Professor Nikolay D. Nenkov. At university as one of my teachers, he helped me and scores of other students understand the math behind the drilling and its techniques and technologies. In industry I have continued to learn from him through working together on a number of projects. The rest of the issue is packed with interesting articles reporting on companies, products and projects from around the world. We have the pleasure of presenting you with Energold in our In Focus section. Being specialized in working in remote locations, the crews at Energold have plenty of thrilling stories and great photos. Their rigs are proving in a positive way that size and power are not always directly proportional. The Topic of the Issue is Case Studies, so we’ve featured four beautifully illustrated case studies from Iceland, South Africa, Serbia and Canada. Across these very different sites, you will see that collaboration between various specialists is achieving excellent results. Then, we have two super product reviews from AziWell and Inertial Sensing, proving that Scandinavia has always had strong R&D and that they are not sleeping! We meet R&D engineer, Gadi Greenman from Epiroc talking about drill bits, wear patterns and the latest from Epiroc in that direction. We have two other articles that offer us insights to new technologies. From Fordia we learn how its modular and lightweight Water Treatment System has been making waves with Alexandria Minerals Corp. And in our Drill Rigs section, we get to see the multipurpose Multitec 4000 MK3 from Dando making light work of difficult terrain, and Hydracore and Geotech’s HeliSonic 4000, which aims to resolve the challenge of continuous sampling in remote locations. The issue is coming out just in time for PDAC 2018. I believe we all hope to see some new faces and new things there. For sure, you will see the magazine there. Enjoy your reading!
GRIGOR TOPEV Founder / Managing Editor CORING MAGAZINE
Faster. Deeper. Safer.
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Table of Contents /NEWS & EVENTS
3
The latest in the industry
A GLOBAL SPECIALTY DRILLER
/21 QUESTIONS 4 Exclusive: Grigor Topev in conversation with renowned inventor and internationally recognised drilling expert, Professor Nikolay D. Nenkov of the Mining and Geological University in Sofia, Bulgaria /IN FOCUS 8 ‘Energold: Experts in man-portable drilling operations’ – Nick Holroyde, Sales & Marketing Co-Ordinator and Richard Thomas, MD Energold Group EMEA illustrate the company’s niche offering to the exploration market. /DRILL RIGS 12 ‘Working wonders in difficult terrain: Dando’s Multitec 4000 MK3’ – Thomas Way of Dando Drilling International explains why the Multitec 4000 MK3 caught the attention of the market. 15 ‘Taking to the skies with Sonic’ – Brant Jackson, Marketing Manager at Geotech Drilling Ltd, describes Geotech’s multipurpose helicopter-portable drill rig, the Hydracore Heli-Sonic 4000 and showcases its use in previous projects. /PRODUCT REVIEWS 18 ‘Leading us in a new direction: Eirik Borg’s AziDrillTM’ – Presented here by Bjørn Christiansen, Managing Director of Aziwell AS, who tells us the background to the AZIDRILL™’s development and provides us with a detailed breakdown of its features. 22 ‘Survey twice as fast with the TwinGyroTM’ – Launched at PDAC 2017, the new gyro survey tool from Inertial Sensing is presented here in clear detail by Duncan McLeod, Owner / Product Manager at Inertial Sensing One AB. /DRILLING FLUIDS 26
‘Exploration mining: Looking for gold while staying green’ – Dani Knezevic, Marketing Consultant at Fordia, explains how its water treatment system helps Alexandra Minerals prevent arsenic contamination at the Cadillac Break Property in Val d’Or, Canada.
/DIAMOND BITS 28 ‘It’s not just about the diamonds!’ – Gadi Greenman, R&D Engineer at Epiroc Exploration Products based in Sweden provides an insightful technical report on the company’s new matrices and latest reaming shell. /TOPIC OF THE ISSUE: CASE STUDIES SPECIAL 31
‘The Grouting Project: Vale’s CCM south mine in Canada’ – Don Black, Mining Operations Coordinator at Gyrodata presents a project carried out by an international team made up of Foraco, Gyrodata, BG Drilling Solutions, and iDD3.
34 ‘Capital Drilling improves hole success rate in Bor, Serbia’ – Geological and technical challenges were overcome by Capital Drilling in this project. 36 ‘Master Drilling breaks new scientific ground and offers added-value service’ – W. C. Olivier and F. J. N. Stassen at Master Drilling discuss the background to a significant collaborative project underway in South Africa. 38
‘Volcanic cores from Iceland’s youngest island’– Drilling specialists from RigSource Inc. present their recent work with DOSECC and scientists, extracting volcanic cores from Surtsey Island using an Atlas Copco CS1000 drill rig.
/CATALOG
40 Diamond drilling services
41 Drilling equipment & accessories
43 Survey equipment
44 Miscellaneous
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Issue 6 //
Topic of the Issue //
January, 2017
DRILL RODS
ISSN 2367-847X www.coringmagazine.com
Explorat ion
21 Questions // Peter Hall - CEO of the Australian Drilling Industry Association
Product Review // The Zinex Mining Corp A5 Diamond Drill
In Focus // Drillcon Group - Europe’s Leading Company in Diamond Core Drilling
Mineral Exploration // Successful Field Trials for RoXplorer® Coiled Tubing Drill Rig
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Dr illing
Coring Magazine January 2018 Cover photo Energold drilling jungle terrain in Madagascar Issue 6 ISSN 2367-847X Not for resale. Free subscriptions at: www.coringmagazine.com/subscribe Coring Magazine is an international quarterly title serving the exploration core drilling industry. Published in print and digital formats, Coring has a rapidly growing readership that includes diamond drilling contractors, drilling manufacturers and suppliers, service companies, mineral exploration companies and departments, geologists, and many others involved in exploration core drilling. Launched in late 2015, Coring aims to provide a fresh perspective on the sector by sourcing authentic, informed and quality commentary direct from those working in the field. With regular interviews, insightful company profiles, detailed product reviews, field practice tips and illustrated case studies of the world’s most unique diamond drilling and mineral exploration projects, Coring provides a new platform for learning about the industry’s exciting developments. Publisher Coring Media Managing Editor Grigor Topev Editor Simone Hutchinson Marketing Manager Melanie Clay Subscription Manager Martina Samarova Correspondent Africa Region Frikkie Van Zyl Graphic Design Cog Graphics Printed by Dedrax Printing House Contact Us Coring Media Ltd. 119B D. Petkov Str., ap. 153 Sofia 1309, Bulgaria Phone + 359 889 53 26 53 Email editorial@coringmagazine.com Website coringmagazine.com Coring Magazine #6
/NEWS & EVENTS
News & Events Australia's leading training body celebrates its 35th anniversary In September, Australian Drilling Industry Training Committee (ADITC) celebrated its 35th anniversary. A not-for-profit organization originally set up as a benevolent body serving the industry, ADITC today plays a much bigger role. The work of the committee prioritizes the vocational education and training needs of the drilling industry — in every sector and for every role — across Australia. ADITC is a registered training provider, registered in accordance with the Australian Quality Training Framework. Its training program includes formal, national qualifications as well as short industrybased courses in drilling. ADITC also plays a
significant role in waterwell driller licensing. In addition, a range of industry-standard reference works is published by ADITC, such as the popular Drilling Manual, which recently released its 5th edition (see: https://aditc.com.au/resources/). ADITC includes representatives of Chairmen and Presidents from the principal organizations in Australia’s drilling industry, as well as Ordinary Members drawn from the most senior levels. All industry associations and bodies with strategic interest in the drilling industry in Australia are invited to join the Australian Drilling Industry Training Committee Ltd.
Capital Drilling’s Community Support Program builds new orphanage accommodation in Geita, Tanzania Through its Community Support Program, Capital Drilling has supported the Neema House orphanage in the Geita region of Tanzania since 2016 and is pleased to announce that a new accommodation block has now been completed and is providing much needed support to local children. Neema House is an interim home built to care for orphaned, abandoned and at-risk children aged from newborn to five years old – it is the only home in the region looking after children under four years old. Originally built to house 20 children, high demand has seen it now supporting up to 40 children.
Facing a further influx of children urgently needing help in early 2017, Neema House approached Capital for further assistance. The company provided expertise and labour to construct a new accommodation block for an additional 20 infants. Employees from the Geita site also gave generous financial donations, which provided food, child-care products and other essential items for the children. For further details visit: www.neemahouse.org
Atlas Copco acquires Australian mining service for new company, Epiroc Atlas Copco’s board of directors announced back in January 2017 that it would prepare a proposal to the Annual General Meeting 2018 to split the Group into two companies. While Atlas Copco will focus on industrial customers, the new company, taking the name of Epiroc will focus on mining and civil engineering customers. The plan is to have both companies listed on the Nasdaq Stockholm stock exchange. Furthermore, Atlas Copco has decided that Epiroc will be the name of the company that the Group will dividend out in 2018, provided that shareholder approval is granted. Epiroc was selected out of almost 1000 names that were evaluated. Epi is a prefix meaning ‘on’ or ‘at’ in Latin and Greek. Roc signals stability and durability, and ‘rock’ is one of the most important materials that the company works with. Faster. Deeper. Safer.
To augment the newly formed Epiroc, Atlas Copco has agreed to acquire the assets of Hy-Performance Fluid Power Pty Ltd. The acquisition is expected to be completed in the first quarter of 2018. The business will be part of Epiroc’s service division in the Mining and Rock Excavation Technique business area (pending approval from Atlas Copco’s shareholders). Hy-Performance Fluid Power is currently based in Brisbane, with sales mainly in Australia. The company provides remanufacturing, service and repair of hydraulic components for drill rigs. It has 26 employees and had revenues of MAUD 7.5 (MSEK 50) in the fiscal year ending June 30, 2017. More information at: media@se.atlascopco.com. 3
/21 QUESTIONS
Exclusive interview with
questions
Prof. Nikolay Nenkov, Inventor and Former Lecturer at the Mining and Geology University of Sofia Grigor Topev: Professor Nenkov, how did you start out at the Mining and Geology University of Sofia (MGU)? Nikolay D. Nenkov: After graduating as a mechanical engineer in 1952 I worked in the construction department of the Bulgarian railways. After gaining experience in machine design, I was able to start work at Mashstroy (a large governmental department responsible for all the machine manufacturing in Bulgaria). I began with simple machine design jobs, but I was soon assigned to increasingly bigger tasks until, at last, I was assigned to the largest and
Prof. Nenkov Professor Nikolay D. Nenkov was born in the town of Elena, Bulgaria in 1928. His academic career began at the Technical University of Sofia, from where he graduated in 1951, majoring in General Mechanical Engineering. Then, in 1959 he joined the Sofia University of Mining and Geology as a lecturer. Four years after defending his dissertation thesis on drilling mechanics in 1974, he was awarded the professorship of Drilling Machines and Mechanisms and Drilling Mechanics. The creative path of Prof. Nenkov is reflected in more than 120 publications in various local and international drilling books and journals. He has written 5 books, 2 monographs. He has over 70 inventions, 26 of which are patented. Prof. Nenkov has made outstanding contributions to the development of tools and equipment related to exploration drilling technology. He is the designer of several generations of retrievable drill bits and roller-latch assemblies, and he is among the world’s pioneers in these fields. For his outstanding scientific achievements, Professor Nenkov was awarded the Order of Cyril and Methodius (First Class) and was conferred the titles Honorary Inventor and Honorary Geo-Explorer by the Bulgarian government. In 1984, he was included in the bibliographic reference book Who’s Who in Science in Europe (published by Longman in the UK). Prof. Nenkov has also held a number of public and administrative positions. He was vice dean and deputy rector of the Mining and Geological University of Sofia, and was also a member of the Bulgarian Attestation Committee. Prof. Nenkov is still actively working and has been an important part of BG Drilling's R&D team during the last few years.
most complicated projects. However, at this point I started feeling unwell and visited
GT: How long you have been lecturing?
NDN: First, the subject of drilling engineering
a doctor. He advised me that, for a young
NDN: By the time I’d retired, I had been a
is focused on the research and production
lad, my blood pressure was too high and I should leave my job. I was quite worried about my health and so I took his advice. Then, I heard about an open position at the Faculty of Mining Mechanics in the Mining and Geology University of Sofia, which I applied for successfully. Soon after, I was
lecturer of drilling mechanics for about 43 years. GT: A large number of graduate drilling engineers find jobs in the industry quite easily. That is, when compared to other,
transferred to the drilling department where
more general subjects such as economics,
I started lecturing on drilling mechanics.
law and business. Why is that?
4
of mineral resources and fossil fuels, while other subjects are of a more general nature. Secondly, the subject of drilling engineering is practical and provides useful knowledge of topics beyond the technology of drilling, such as of drills and equipment. When drilling, you reach different rock formations that in some cases require you to react quickly: you need to decide what to do, Coring Magazine #6
which equipment to use and how to use it. This profession requires creativity just as much as scientific aptitude. GT: Where do drilling practice and theory meet? NDN: They meet only at the drill site. GT: Is it a mistake that most diamond drilling contractors do not currently invest in staff training? What would you advise them? NDN: I think it is. The more automation we see on the drills the more this problem will deepen. Pressing buttons and moving levers is not enough. I would advise diamond drilling contractors to train their teams in the basics of drilling, so that the experience their staff is getting is based on some solid fundamentals, and not on personal science fictions. Without this approach, proper problem solving will not be possible and creativity will be absent. GT: Why does the diamond drilling industry nowadays produce such a limited number of inventions? By contrast, we cannot say the same thing about surveying technologies. NDN: During a Boart Longyear meeting in Amsterdam in the early summer of 1998 I presented 23 innovations, including a roller latch assembly, a retrievable drill bit and a bottom hole shock absorber. A good degree of interest was shown in these, but the prevailing opinion was that the current wireline system developed by Boart Longyear is so successful that the company doesn’t see any reason to invest in general innovations. So, actual market needs and innovation are not always travelling in the same direction.
GT: How did you end up at that meeting? NDN: At that time, the Bulgarian governmental drilling department was buying a number of drilling tools from Boart Longyear for its exploration programs. The local representative was half Bulgarian, half Canadian and as he was familiar with my work he invited me to that meeting. GT: What are the required qualities of a piece of equipment for it to be practical and to find commercial application? NDN: Reliable, simple by design, easy-tomaintain and inexpensive. GT: What is your favourite invention? NDN: I enjoyed the work on the roller latch assembly. The existing form of latch assembly would easily get stuck, while with the rollers, retraction is guaranteed. I offered it to the Bulgarian geology committee in 1965, but they were reluctant. Despite that, the roller latch assembly was produced in Asenovgrad during the 70s in what was the biggest drilling manufacturing plant at that time, and the assembly was used in Bulgaria to a certain extent. GT: Earlier in your career, you were involved with the Japanese company, Koken Boring Machine (one of Asia’s biggest drill rig manufacturers). Please tell us more about this. NDN: During a conference in Algeria in 1987, I met with the president of Koken Boring Machine, Dr. Takumi Eguchi who expressed a keen interest in the retractable drill bit. Their representative visited Bulgaria a few months later and witnessed a demo run in Panagyurishte. Further cooperation was established, but no final commercial agreement was ever signed.
Retrievable drill bit demonstration in 1987, Panagyurishte. GT: Please tell us more about the work you did with the Swedish company, Hagby Bruk before it was acquired by Sandvik. NDN: Hagby was interested in the retrievable drill bit and the bottom hole shock absorber, and we worked together in that direction for a period of three years. The shock absorber was manufactured and put into action with good results. Hagby has contributed to the diamond drilling industry with a variety of innovations and working with them was a genuine pleasure. GT: I know you have a few developments that will be hard to find commercial applications for. Notwithstanding this, they remain very interesting. Could you please describe them?
NEW
If you have a question for Prof. Nenkov, email us at editorial@coringmagazine.com and we will publish the answer in 'Post-21 Questions' in our next issue.
Faster. Deeper. Safer.
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/21 QUESTIONS
NDN: Yes; first, there is the drill bit with flexible segments, designed to compensate rock foliation and reduce hole deviation. Secondly, there is the drill bit with replaceable diamond segments that reduces cost, and its modified version with segments that can be turned 180 deg and used a second time. A third one is the preloaded thread connection that increases the rod’s thread yield strength capacity; fourth is a threadless centralizer or reaming shell that can slide and be locked onto any place on the drill string quickly and easily. GT: Can you tell us about an interesting drilling case you have witnessed? NDN: I remember some interesting fishing jobs. We experimented with a few special fishing tools, but I cannot recall any specific details, unfortunately.
6
GT: How were exploration works in Bulgaria managed before 1990? NDN: The geology committee was the head of all exploration and drilling works, and underneath it were a few big drilling departments (in Sofia, Varna, Yambol, Asenovgrad and others) as well as a number of large departments for research, development and fabrication in Asenovgrad. At that time there were a few hundred drill rigs that were producing around 250 000 to 300 000 meters per year. These were largescale campaigns for a relatively small country GT: What is the future of diamond drilling, in your opinion? NDN: We will see more drill automation, which will reduce physical activity and increase safety. However, as I mentioned earlier, a thorough understanding of drilling processes – whether automated or not – is essential and without this, professionalism will be absent.
GT: What will we see the industry focusing more on? NDN: Focus should be on deep-drilling techniques, as resources occurring at shallow depths have already been explored. Also, being able to reach multiple targets from one single hole will be the key to success. GT: What is your advice to all drilling companies? NDN: To focus on quality, not quantity. GT: What is your advice to all drilling manufacturers? NDN: I would advise them to create robust, low-cost and multifunctional equipment. GT: What would you like to say to our readers? NDN: Use all drilling equipment to its maximum capacity; use its hidden potential, as there is always such. C
Coring Magazine #6
Faster. Deeper. Safer.
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/IN FOCUS
Energold Drilling Corp.
Experts in ManPortable Drilling Operations by Nick Holroyde Sales & Marketing Co-Ordinator, Energold Group and Richard Thomas MD Energold Group EMEA Energold Series rig drilling frozen marshland in Finland
Energold is a diversified, global, drilling solutions provider, that services the mining, geotechnical, water and energy sectors worldwide. Listed on the Toronto stock exchange under the ticker TSX-V: EGD, Energold has been providing a comprehensive range of drilling services for over 20 years in 24 countries. The EuropeMiddle East-Africa Division is based in the UK. The company has operations in more than 10 African countries including Côte d'Ivoire, Senegal, Guinea and Djibouti, and, most recently, Rwanda, where Energold has been awarded a contract for a project. Energold also has exploration 8
drilling operations in many South American countries, including Mexico, Peru, Panama, Argentina, Brazil and Chile.
The ability to deliver these projects in a genuinely low impact manner means overall costs for road building, local compensation or any reinstatement are kept to a minimum.
Niche services for difficult sites
Nurturing our client relationships
While offering a diverse range of drilling services, Energold’s niche service to the exploration market is the provision of manportable rigs suited to drilling programs in remote and difficult-to-access locations that have limited infrastructure. Created to meet the demands of such environments, Energold’s modular Series rigs have also been designed specifically to reduce the environmental impact of their drilling operations, while compromising as little as possible on depth capability or performance.
Energold carries out work for a significant number of Junior, Intermediate and Major companies. Côte d'Ivoire is its largest market, where it presently has 11 drilling rigs. The company’s philosophy is to build longstanding relationships with as many clients as possible; some clients have been working with Energold over many years. For example, the company flew in a portable drilling rig for a client in Senegal in 2011, which was for a new gold prospect that Energold carried out the initial exploration of 1500 m of diamond drilling for. Later, this project expanded Coring Magazine #6
and in fact is now in the mine construction phase, where Energold has completed over 60 000 m of mainly diamond core drilling but also some infill revese circulation (RC) drilling. Right now, Energold is preparing to recommence drilling in February 2018 to hopefully expand the resource. In addition, the company is going to be drilling for the same client on another prospect, in Côte d'Ivoire, and will be looking to maintain this relationship, as well as its many other client relationships, into the future.
The Series man-portable fleet Part of an overall fleet of 230 drilling rigs, Energold’s fleet of modular, man-portable, minimal impact drill rigs is the largest in the world, and its teams are highly experienced in the delivery of projects in a wide range of environments. Drill programs have been undertaken at high altitude locations, in tropical bush or jungle sites, on frozen environmentally sensitive marshes or within village locations. This wealth of experience and continued development enables the company to deliver projects safely, cost effectively and, where possible, ahead of schedule.
Drilling in Finland Faster. Deeper. Safer.
The company also operates traditional diamond core drilling rigs, such as the CS1000 and CS14, as well as a number of RC and air core drills to provide flexibility for its clients.
Small in size and big on performance The company’s portable rigs can easily be packed into a 20 ft container along with a complete down-the-hole tooling package for shipping by sea, or, alternatively, crated for airfreight purposes. This enables Energold to respond quickly and deliver the same high standards to any drilling project worldwide. The rigs themselves are modular in design, which provides flexibility for moving purposes, and the drills still deliver over 100 horsepower. This enables them to drill to 150 m in H-size (63.5 mm core), 550 m in NTW-size (56 mm core) and 800 m in BTWsize (42 mm core), subject to the prevailing ground conditions. They utilize 1.5 m rods that are generally easier to transport than 3 m rods, particularly in man-portable situations. The depth capability of the rig is maximized by using thin wall (TW) NTW and BTW rods and barrels, which also has the benefit of producing slightly larger core diameters than standard wireline (WL) NWL or BWL. The capabilities of the rigs not only mean production is maximised but also help Energold’s teams ensure they maintain the highest technical standards of core recovery and directional stability. All projects utilize modern industry standard survey and orientation techniques, and Energold is also able to provide directional drilling or wedging where required. The rigs have mud mixing systems as standard and can be set up with mud collection and recycling, wherever required, for even lower environmental impact or where the water supply is limited. The portable rigs are produced in house by Energold’s UK-based manufacturing subsidiary, Dando Drilling. Energold acquired Dando Drilling International in 2011 as part of a diversification strategy that also included an energy company, Bertram Drilling and an infrastructure drilling company, Cros Man, undertaking Horizontal Directional Drilling (HDD). The aim of the Dando Drilling acquisition was to expose the Group to rig manufacturing opportunities in the water, mineral and geotechnical markets
Trailerized Series rig at work in Germany while also allowing the Group to continue developing and manufacturing its own drills in-house.
The Series III manportable on Mount Nimba, Guinea In 2010, the company was awarded a contract for the provision of a single portable Series III drilling rig to work at the steep and precipitous Mount Nimba project in Guinea – the Société Minière de Forage Guinée (SMFG) project. The single portable drill was established on the project in mid-2010. Throughout the rest of 2010 and into 2011 the company managed to establish good drilling performance and reliability. Minimizing access requirements at the property, which had environmental restrictions placed on it due to its location within the confines of the Mount Nimba Nature reserve, was a key benefit for the client. The portable drill further demonstrated its ability to adhere to the strict safety framework of the client, joint venture (JV) partners BHP Billiton and Newmont Mining. In mid-2011 Energold expanded the operation to four diamond core drilling machines. The requirement was for an expansion of the existing program, which involved moving into a new area of friable iron ore that required larger diameter core samples and provided technical drilling challenges to ensure sample quality and 9
/IN FOCUS
Energold Series rig at work on Mount Nimba, Guinea recoveries were maintained in these formations. The rigs had to be able to move across narrow, hand-cut access tracks, where no mechanized plant was allowed to travel.
Tailoring the template: the CS 1000 ATV man-portable rig For that reason Energold had entered into a contract with Atlas Copco Mining and Exploration in Canada for the development of a new version of the tried and tested CS 1000 drilling rig that was to be tailored to the Energold philosophy of drill-rig portability. The new design allowed for the normally trailerized CS 1000 to be split into four main modular sections whereby each section could be fitted with stub axles and wheels for movement behind vehicles, or fixed onto a helicopter skid for movement by air to remote locations. This flexibility gave the client more options in their choice of location for the drill to access, while the drill’s capabilities still provided the performance necessary for dealing with a range of conditions. The prototype design 10
for the CS 1000 ATV was finalized in mid2011 and manufacturing commenced. In addition to the existing portable Energold rig on-site and the CS 1000 rig, two further Energold Series man-portable drills were manufactured for the project in Canada. Drilling was carried out using triple tube P and H-sizes and thin wall equipment, while the methodology and mud programs developed with its suppliers allowed Energold to maximize core recovery and production rates across the project. The project was completed successfully through a combination of the correct mix of rig types and a co-ordinated team effort between the client representative and the Energold team.
Flexibility means efficiency Energold’s portable Series rigs can provide a flexible solution to client project requirements, for example, they have been mounted onto tracked carriers, custommade trailers and also mounted onto sleds for movement with snow scooters in arctic conditions. These other rig-mounting options reduce moving time between drill
pads where hand portability is not required and additional access is available. The rigs can be demounted from these carriers if required and converted back to their handcarried status.
Safety is assured with the Series As would be expected, the Energold portable Series rigs meet the highest safety standards and incorporate all the appropriate features including rotation guarding systems, and are constantly being developed to incorporate improved safety and performance. All of Energold’s drill crews observe a rigorous health and safety protocol with improvement and training being carried out continuously. The company’s safety culture is as important to its people as their technical expertise and remains a top priority throughout their operations worldwide. With a rich, diverse and successful track record in this most specialized of markets, Energold is extremely well placed to be the exploration drill contractor of choice on a wide range of future projects. C Coring Magazine #6
/DRILL RIGS
Working wonders in difficult terrain: Dando’s Multitec 4000 MK3 by Thomas Way, Dando Drilling International In 2012, market pressures in the mineral sector changed significantly. Mineral prices, and especially of coal, took a dive, and amid the uncertainties many major miners and contractors sought to freeze capital expenditure. Sales of larger rigs began to slow throughout the industry. For Dando
Drilling International, this affected their highly powered larger rigs like the Mintec 12.8, which, until 2012, had been their bestselling versatile mineral exploration rig. Exploration, of course, continued to be necessary, but for everybody in the industry good results now had to be obtained
while focusing on reducing initial outlay and running costs. In response to these straightened conditions, Dando designed the Multitec 4000, creating a versatile trackmounted drill rig with a small footprint. It proved to be a timely decision. Upon its launch in early 2015, the Multitec 4000 immediately caught the attention of the market and has since become the most significant new rig in Dando’s mineral exploration range. Dando Sales Director, Quentin Dulake comments that ‘Our customers saw the Multitec 4000 as an opportunity to continue drilling while maintaining profit margins that had suffered due to mineral market conditions’. Capable of the full range of mineral exploration drilling techniques with penetration rates for wireline coring and open hole boring that matched much larger, more expensive equipment, the rig was a cost-effective solution to demanding mineral exploration programmes, but at a much lower price point.
Green benefits: low impact on flora in forest and jungle
The Multitec 4000 MK3 outside the Dando Drilling International factory in West Sussex, where the company has been building rigs for 150 years. 12
After its launch in 2015, initial interest in the early Multitec 4000 came from international sales across Africa and South America for a range of mineral targets. The response from customers was positive with several key benefits quickly emerging. Among these, the small footprint of the rig allowed access to forested or jungle environments with minimum disruption to flora. While able to load 3-m rods, the mast extension allowed tripping of 6-m lengths expediting a change of tooling or redeployment to a new drill pad. Efficient engine sizes coupled with small but powerful Coring Magazine #6
rotary heads meant that customers were experiencing large reductions in fuel usage, with some reporting consumption as low as 5 L/h while meeting or exceeding target penetration rates.
Customer feedback influences design decisions Strong customer relationships and feedback have played a key role in ensuring the development of the Multitec 4000. One such customer is UK-based Hughes Exploration and Environmental Drilling. With a diverse fleet of drill rigs catering to exploration drilling as well as units for water well, geothermal and sonic applications, they were looking for a rig to drill hard rock quarries around the UK and decided a Multitec 4000 would meet their requirements. The rig was set to work immediately, using N-Wireline and H-Wireline coring on a range of targets from dolerites to limestone. Purchased to replace two older rigs in his fleet, owner Martin Hughes reported that the Multitec 4000 has ‘done everything that
we have asked of it,’ drilling in the 80–180 m range. ‘The rig is already programmed on a number of exploration contracts, including H and P wireline, drilling both vertical and inclined boreholes, along with domestic GSHP and water borehole projects between jobs.’ The proximity of such an exploration company to the Dando factory, and the experience of Hughes, who has run the company for over 30 years, ensured direct and valuable feedback to Dando engineers and led to refinements in Hughes’s own rig, which have been implemented directly into Dando’s new models. With increasing demand globally for the rig, it quickly became apparent that, while a multipurpose machine, the Multitec 4000 was filling a niche in the market for mineral exploration. In particular, a number of sales to customers drilling in equatorial jungle regions with difficult terrain and limited access along narrow tracks and between trees spurred the design team to focus on producing a fully fledged exploration version of the rig.
No track too small, no terrain too tricky One such customer was exploring a challenging concession in the jungles of Central Kalimantan. The terrain was so inhospitable that previously it was considered only accessible by man- or heli-portable equipment. However, the scope of the project meant the customer wanted a rig that was more versatile than the portable equipment available. Wireline coring in P and H was essential, but so was the ability to drill RC either with a hammer or with air-core bits when required. The Multitec 4000 provided an obvious solution: the power and versatility to cater for the drilling needs of the program, but at a size that could navigate small paths through the jungle. Since Dando was receiving many such enquiries, the company saw an opportunity for further development of the rig for these kinds of projects. ‘Although we knew the Multitec 4000 was an exciting new product in the market, the level of adoption from the mineral sector was probably greater than we had anticipated,’ explained Dulake. ‘With enthusiastic reports from existing and new customers, and plenty of feedback, our design team had a very strong picture of where we wanted to take the design.’ Rupert Coler, a design-engineer at Dando, decribes the criteria for the new model: ‘The Multitec 4000 was frequently being used in uneven, sometimes steep, forested terrain with muddy, sticky or slippery surface conditions. Our first target was to ensure the rig could navigate these types of ground conditions quickly and with maximum safety to the operator.’ As a result, the Dando engineers focussed on designing the chassis and component layout of the new Multitec 4000 MK3 to achieve a low and central centre of gravity.
Stronger, greater and safer: the MK3
Core drilling in Bolivia. The MK3 has a 74Hp Tier 4 final engine or 111Hp Tier 3 options and rotary head spec of 6000Nm torque and 750 rpm. High speed motors can take this to 1100 rpm. Faster. Deeper. Safer.
Wider 400 mm tracks were selected over the standard 300 mm versions, with options including steel single-bar grousers to provide good clearance of mud in wet environments, or rubber tracks for gentler surfaces. The track-base was also widened slightly to 1.55 mm, which markedly increased the tilt angle of the rig with a view to increasing safety while traversing slopes or other uneven terrain. A high-power hydraulic 13
/DRILL RIGS
climbing winch was designed-in as an option to provide additional security when navigating steep and slippery terrain. In standard form, the rig is supplied with a 74 hp Tier 4 Final engine to meet regulations in European and North American markets, and a 111 hp Tier 3 has been chosen for the rest of the world, although other options are available. With most customers for the rig exploring to depths in the 50–250 m range and in core sizes between N and P, the compact but powerful RH6 rotary head – usually used on the larger Multitec 9000 rig – was selected as a high-performance option. To ensure sufficient oil was supplied to the 6000 Nm/750 rpm head and upratedcrawler motors, a high efficiency hydraulics system was specially designed by UK-based Hydraulic Alliance around Bosch-Rexroth pumps and motors. Two mast options are available for 2.6 m and 3.6 m working strokes and both have deployable mast extensions to allow two rods to be pulled at a time. The folding mast extension ensures that, when tracking, the mass is kept firmly at the middle of the rig, providing a stable base. Double-acting hydraulic break-out clamps at the foot of the mast make and break joints, while an optional floating sub ensures the longevity of wireline rods and sub adapter threads to meet the demands of an intensive exploration program. A new console has been designed on a swing arm so the driller can choose a position that affords him the clearest and safest view of the borehole. With safety being taken seriously not only in the west, but also increasingly in the developing world, the rig conforms to all new UK and EU regulations and standards, such as BS EN 16228. The opening of guards leads to an immediate decrease in rotation speed, while power units meet the rigorous
The control panel is mounted on a sturdy swing-out arm to give the operator a clear view of the borehole. Controls are clearly laid out and well spaced for easy operation. emissions standards and have noiseattenuated canopies. For the most difficult terrain, a robust radio remote control option (supplied by Scanreco) enables this machine to crawl up steep inclines in muddy and slippery conditions, thus ensuring the safety of the operator. Sales account manager, Callum Mee believes the Multitec 4000 MK3 is already capturing the market for versatile, powerful, ultra-compact exploration rigs: ‘The mineral market is showing signs of revival. We’ve already delivered rigs and received impressive reports from every continent. ‘And we are receiving a stream of enquiries and orders for the rig. We currently have another four in build, two for coring, and two for reverse circulation and
RAB drilling with an accompanying track mounted compressor. Our sales figures show it is our best-selling rig over the last 12 months with several sales already confirmed for the coming year.’ Sales Director, Quentin Dulake is buoyant about what he considers to be Dando’s best small rig to date: ‘I think we’ve nailed it with the Multitec 4000 MK3. This is not just an excellent multipurpose machine. We have the performance of a dedicated wireline rig, or a dedicated RC Aircore rig, or a dedicated RAB rig, all from one ultra-versatile platform. In response to the demand, we’ve added the model to our forecast build schedule to keep lead-times down and get rigs to our customers as quickly as possible.’ C
Contributing an article, case study or news item to Coring Magazine is free and everyone is welcome to participate. Contact us at editorial@coringmagazine.com
14
Coring Magazine #6
Taking to the skies with Sonic by Brant Jackson, Marketing Manager, Geotech Drilling Ltd In a world of remote project locations and an increasing requirement for continuous highquality samples, Geotech Drilling Services Ltd (Geotech), recognized the need for a remote access helicopter-portable sonic drill. After months of research and development, in conjunction with rig suppliers and technical experts, Geotech unveiled the newest addition to its ever-expanding fleet of drill rigs: the Hydracore Heli-Sonic 4000 (HHS4000). The Geotech Drilling Group (Geotech) is a multi-discipline surface and underground drilling and testing company that is active
in the exploration and infrastructure drilling markets, with projects in Canada, the United States, South America, Greenland and West Africa. Clients include all sizes of mining companies, governments, and engineering firms. The HHS4000 will revolutionize the way continuous sampling in remote access areas is completed. This drill is a multipurpose unit that can complete several drilling methodologies including, but not limited to: sonic, coring, mud rotary and air rotary. Two hydraulic power packs are employed when the unit is sonic drilling, while an
interchangeable mounting plate allows the replacement of the sonic head with a conventional rotary head to facilitate mud, air and core drilling. With this drill, Geotech’s Sonic division is capable of completing various types of drilling programs, such as: • Continuous soil sampling in geotechnical and environmental or remediation investigations • Down hole testing such as standard penetration tests and Shelby Tube sampling
Geotech’s Helicopter Portable Sonic Drill at the SnipGold’s Johnny Mountain Mine Property Faster. Deeper. Safer.
15
/DRILL RIGS
•
Investigations to optimize recovery or quantify reserves in mineral or aggregate exploration • Confirmatory testing and continuous sampling during dam and levee investigations or remediation • Installation of monitoring probes and recovery wells in landfill investigations and expansions • Mirco-pile or earth anchor installation during infrastructure projects. The HHS4000 successfully completed its first drilling program under Tahltech Drilling, Geotech’s partnership with the Tahltan Nation Development Corporation (TNDC), which was created to provide opportunities in the drilling industry to the communities within the Tahltan First Nation Territory in the Golden Triangle of British Columbia. The HHS4000 drill is providing a new, efficient method for the investigation of overburden deposits, allowing greater accuracy of field data collection, which is of particular importance to both mining and engineering firms when reviewing deposits and also planning infrastructure works. In recent years, the sonic methodology has seen increased implementation with investigations of soft subsurface sediments, notably tailing deposits. With the added benefit of achieving up to 100% recovery throughout the bore, the engineering and soil data that can be obtained is second to no other drilling method.
A geotechnical investigation was completed for SnipGold Corporation (a Seabridge Gold subsidiary) on the old Johnny Mountain Mine Property, near the Bob Quinn airstrip. SnipGold has recently initiated a robust environmental program aiming to remediate areas of historical mining activity at its newly acquired Iskut property in north-western British Columbia, including the Johnny Mountain Mine, a past gold producer. The heli-sonic drill was used to advance five boreholes to depths of up to 15 meters, through compacted tills, clays, boulders and rock. Throughout the program the drill crew was asked not to use any water to advance the boreholes to ensure the ground was not subjected to increased bit face pressures that could potentially affect the integrity of the structure. Further to the sonic drilling, a secondary heli/skid drill was utilized to complete ODEX drilling for the installation of 2” piezometers. The ODEX methodology utilizes a rotary air blast method while drilling a casing to sleeve the borehole, allowing for the installation of instrumentation. 'Tahltech Drilling Services proved to be a valuable partner for SnipGold. We set rigorous technical expectations for this group and they were met. With the Johnny Mountain Mine Project, it was extremely important that all our partners adhered to set schedules and timelines, which Tahltech did. Because they reflected our commitment to safety in all their operations, they helped to build a strong relationship and we believe
their latest technology will be beneficial for Projects in the area.' Elizabeth F. Miller MSc, RP Bio, Program Manager, SnipGold. For more information about the HHS4000, its capabilities and availability, review the rig specification sheet at www.geotechdrilling.com and contact us at info@geotechdrilling.com or 1–888–228–1234. C
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/PRODUCT REVIEW
Leading us in a new direction: Eirik Borg’s AZIDRILL™, made by Aziwell by Bjørn Christiansen , Managing Director of Aziwell AS, Norway
Aziwell is a Norwegian service company established in early 2015 by Eirik Borg, having more than 17 years of experience within R&D and field services related to directional core drilling (DCD) and borehole surveying. Eirik has participated in drilling projects in Hong Kong, Japan, Singapore, Taiwan, China, Australia, Sweden, Finland, Norway, Switzerland, Portugal, Poland, Ireland, Liberia, South Africa, Brazil, Chile, Colombia, Guyana, USA and Canada and he is considered as one of the best directional drilling specialists. The decision to start his own company was motivated by the idea of developing a new type of steering system for downhole motors and hammer drills. Giving priority to the steering system, he later reached significant breakthroughs, leading to several patent applications. It soon became clear that the steering system had several
Eirik Borg and his invention - Azidrill 18
potential applications beyond its planned use in motors. Essentially, it was discovered that the system could determine the orientation of any downhole object, without the need for sensors to be in motion or a mule shoe. This was achieved by developing a technology that could sense the position of a reference point on the drill body without physical contact. This turned out to have a significant impact on the future of his company, as Eirik knew that the drilling industry, among others, had been struggling with the old universal borehole orientation mule shoe sub for many decades, whether it was wedging, smalldiameter downhole motors, packers or DCD. With his background, it was natural to focus on DCD – an area in which he had extensive experience, and which offered substantial
potential because of there being only a few competitors. With the new steering system being efficient, robust and easy to operate, Eirik wanted to make it a standard tool for the industry and thereby bring DCD into a new era: DCD would become an essential part in the early stages of exploration projects and thus, potentially, revolutionize the industry. Through co-operation with Innovation Norway and a local partner company, a set of development projects was started, which lead to a breakthrough in early 2017 when the first prototype of AZIDRILLTM Directional Core Barrel was field tested by the Finnish Arctic Drilling Company (ADC). The test regime involved corrections in 3 holes with inclination ranging from vertical to -45 degree, while max depth was approx. 650 m. The latest hole resulted in a 10 degree correction performed within 1,5 shift. The total length of the curvature was 50 m. Another great breakthrough was the test verification of the ORICORE™ Core Orienter, which is the first-ever core orienter to have its electronics fully integrated into a standard-length core barrel-head assembly. Consequently, there is no need to extend the core barrel to compensate for the core orienter electronics or compromise on core length. The ORICORETM simply replaces the standard core barrel head, all done in a five-minute operation, thus eliminating the time consuming and expensive rod tripping when oriented core is needed. Our experience is that the drillers have shown to be very enthusiastic about the operation of ORICORE™; one feature is less work strain since no rod tripping is needed, and it is much easier to handle the drill due to less weight and length in an already cramped working environment. Coring Magazine #6
ORICORE™ has already undergone extensive testing in the field, has proven its capabilities and is now commercially available.
General DCD technology working principles Before explaining the key features of AZIDRILL™ let’s first look at the key functions required to enable DCD. Referring to Figure 1, the drill string is connected to the DCD tool through a drive shaft (11) and thus is driving the drill bit (12). Deflection of the drill bit, and hence the borehole deviation, is accomplished by an adjustable eccentric bearing (8) arranged between a rear and front bushing, bending the drive shaft in a radial direction. To maintain a fixed toolface angle, the eccentric bearing needs to be rotationally fixed during drilling. This is accomplished by fixing the eccentric bearing to an outer cylindrical housing that also houses a packer (6) with pads that are forced towards
the borehole by the pressurized drilling fluid. The pads are configured to prevent rotation, but allow the outer cylindrical housing to slide in the borehole direction while drilling. An axial trust bearing (4/5) arranged between the drill string and the outer stationary housing is thus required to transfer the axial thrust force. Toolface angle adjustment is accomplished by locking the outer housing to the drill shaft and turning the drill string by hand from topside. In order to adjust the eccentric bearing 'Dogleg setting', the drill has to be brought to surface, although alternating the toolface angle for short drilling distances can be used to calmed down the dogleg, before continuing the curvature. The core tube (2) assembly is pretty much configured in the same way as a standard core tube with a few exceptions: i) the core tube needs to have a smaller diameter because it is going to pass through the hollow
3
drive shaft, and ii) it needs to house an instrument section to measure the rotational
1
position of the eccentric bearing, hence the
2 4
5
toolface angle, and preferably the borehole inclination. FIGURE 1 // Simplified sketch of a DCD system 1. Drill string
6
2. Retrievable core tube with orientation instrumentation 3. Wire line 4. Axial trust bearing rotor element
7
5. Axial trust bearing stator element 6. Packer with seals 7. Rear radial bearing/bushing
8
8. Eccentric bearing/bushing 9. Front radial bearing/bushing 10. Front stabilizator
9
12. Drill bit and reamer
10 11 12
Faster. Deeper. Safer.
11. Drive shaft dditional features required: A coupling A mechanism between shaft and outer stationary housing to enable toolface adjustment
AZIDRILL™
AZIDRILLTM key features The following design criteria were set forth for the AZIDRILL™ design, all being accomplished: • Collect oriented B-size core samples and thus increase geological information and drill-bit penetration, as compared to existing technology. • Measure toolface orientation and borehole inclination during each run with no extra time spent, as compared to standard drilling. This implies that the rotational position of the eccentric bearing should be sensed directly without fixation or alignment between the components. • Correction of toolface angle to be accomplished within minutes without use of fixation or alignment between the rotational or stationary components. • Achieve similar travel velocities as for standard core tubes; also for horizontal boreholes where the core tube needs to be pumped. • Physical length of DCD drill to be similar as for standard drills to facilitate easy handling and use of a standard overshot to hoist the drill in place without dismantling the drill. AZIDRILL™ is only 0.3 m longer than standard drills. • Enable the operator to freely adjust the flow rate or even cut it down close to zero for sharpening the bit, without affecting the packer functionality. • Maximize use of standard drill components to accomplish easy access to spare parts. • Facilitate close to borehole bottom azimuth readings. 19
/PRODUCT REVIEW
The final key question would thus be what about life time of critical wear components? It is essential that the drill shall be able to accomplish the complete downhole job without bringing it to surface for servicing. In most cases 10–50 meters of DCD operation would be sufficient to correct a borehole deviation or to perform a side kick. In the latest test program carried out together with ADC the AZIDRILL™ finalized the 50-meter curve without noticeable signs of wear on the critical components. Even though Aziwell has already put a lot of effort into optimizing the design and material composition of the drill wear components, continuous R&D work will be carried out throughout testing in our in-house test rig with the ultimate goal being to achieve little or no need for site maintenance..
Marketing strategy Even though the operation of the AZIDRILL™ has proved to be simple and efficient, it must be considered as a tool that requires specialized skills from its operators. As well as ensuring they have the appropriate mechanical skills to service the tool, the operator also needs to have a very good understanding of the drilling process, borehole surveying and planning software that comes along with AZIDRILL™. Therefore, we believe that the tool is best promoted by specialized service companies like Aziwell and our agents, but efforts will be put towards handing the system to drilling contractors directly after some training. Currently, we are looking for business partners in leading markets, as well as experienced directional drillers for our own projects, to engage in DCD projects worldwide that would benefit from Aziwell’s state-of-the-art directional core drills, survey tools and planning software. For readers who find this interesting, please visit us at www.aziwell.com and make contact, or visit us at the PDAC 2018 in Booth No TS6409N. C 20
ADC K9 drill rig Coring Magazine #6
Faster. Deeper. Safer.
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/PRODUCT REVIEW
Survey Twice as Fast with the TwinGyro by Duncan McLeod, Owner / Product Manager at Inertial Sensing AB
“TwinGyro is the fastest and simplest gyro we've used onsite. Two surveys in one... Brilliant” - drilling contractor, Goldfields, Western Australia The TwinGyro™ is the latest gyro survey system available from Inertial Sensing. Launched at PDAC 2017 in Toronto, it is making inroads into the surveying markets around the world in both the mining and the oil and gas sectors. In mining it halves the time required to generate multiple fully quality assured surveys. Combining a new fast continuous survey mode with the ability to get two surveys from a single run in-hole, it is possible to survey a hole more often during the drilling process, with very little rig downtime. Since the gyro is used for considerably less time on each run it can be economically shared between a number of rigs on location. So not only is survey time per rig dramatically reduced, the number of gyros required on location is also reduced. This saves both operating costs and capital equipment expenditure. No other gyro system can offer these savings.
By achieving this, the TwinGyro™ represents the combination of a series of developments that have been ongoing at Inertial Sensing over the years that we have been working on gyro survey tools:
Two surveys for the price of one
Miniaturization Our SlimGyro™ is the world’s smallest gyro survey tool. The TwinGyro™ contains two independent SlimGyro™ systems in a platform the size of a standard gyro tool.
The fundamental idea behind the TwinGyro™ is simple. If two independent gyro systems could be built inside a standard gyro tool body and operated as easily as a single gyro then the tool could be run just once in a hole to get two surveys. Two surveys for the price of one. The two independent surveys would serve as a check on each other and eliminate the need to run consecutive surveys of the same hole (e.g. an 'in' and an 'out' pair), as is the standard practice in many operations to ensure survey quality. But such a dual gyro tool would need to be power efficient in order to run on a single battery, be highly accurate so that the data can be sensibly compared and, of course, have a very small electronics platform to fit two systems inside one standard casing. 22
MEMS technology We use only MEMS sensors in our gyro tools. The gyros used in the TwinGyro™ represent the peak of performance for their size available today, which is considerably better than that available even only five years ago. Low power systems We go to extreme lengths to ensure the electronics and embedded systems are as power efficient as possible. Because of this, the TwinGyro™ can survey for over 100 hours, if needed, on a single standard battery charge. Consequently, its power consumption of 0.4 W is so low that it generates virtually no heat while downhole, making it possible to do long and deep surveys.
Furthermore, since they are reference systems and navigate from point-to-point throughout the survey they do not suffer the latitude and directional limits of accuracy experienced by north-finding gyro tools and magnetic tools. Such tools are inherently less accurate surveying in east/west directions compared to surveying north/south, as a matter of pure physics. The TwinGyro™ is equally accurate in all directions and at all inclinations. In a test performed by a user in Australia a test pipe of 124-meters length was setup and carefully land-surveyed. A range of commercially available tools was used to survey the pipe for the purposes of comparison, with each tool performing eight surveys of the hole. The TwinGyro™ was the clear winner, with a maximum misclose at end-of-hole of 0.6 meters, or less than 0.5%.
Continuous improvement Our software, navigation and calibration systems are under continuous development. Our users always have access to the most up-to-date technology possible.
Superior performance at speed The TwinGyro™ uses the latest commercially proven MEMS gyros released to the market. A testament to their performance is the fact that the rugged isGyro™, TwinGyro™ and SlimGyro™ are all used for deep vertical surveys in the US and Russian shale gas fields.
TwinGyro™ Coring Magazine #6
One competitor achieved a misclose of 3.5 m, or nearly 3%. On top of this accuracy the TwinGyro™ performed the required eight surveys in half the time achieved by the competition.
Instant QA/QC or a back-up tool What benefit is there really in running two gyros at the same time? The major benefit is that the two independent tools are carefully aligned and calibrated together, so that the results from the two tools are directly comparable. You get a direct apples-to-apples comparison of two independent surveys that are known to have been run in completely identical conditions. The tools therefore act as a quality control of each other. If there is a significant difference in results then you know that something needs to be investigated in the hole or in the tool function. By using the averaging function built into the software you also get the most accurate result possible from the two surveys, along with the two independent surveys. You are spoilt for choice in the data that can be used from a single run down the hole. Alternatively, in the rare instance that one of the gyros in a TwinGyro™ unit breaks down then it can simply be deselected in the software for use in surveying. You still have one fully functioning gyro in the system so you can continue to survey.
Multiple survey modes in one tool The TwinGyro™ implements three main survey modes: fast continuous, traditional multishot and delayed start. Fast continuous The fast continuous mode is the defining mode of operation for the TwinGyro™. By connecting a wireline depth encoder to the survey computer the TwinGyro™ can be run at speed into or out of the hole, without stopping at every station. In this way a deep hole can be surveyed in a fraction of the time of a standard multishot gyro system. The desired station interval can be changed in processing after the survey is downloaded, so virtually any station interval can be generated after surveying from a single run in the hole. Faster. Deeper. Safer.
Traditional multishot The familiar multishot gyro survey is the mainstay of most survey operations and is of course available for the TwinGyro™ as standard. Users of the isGyro™ or other similar systems will feel comfortable running the TwinGyro™ with little introduction. Delayed start The delayed start mode allows you to start a TwinGyro™ in sleep mode and have it wait for up to several days before it wakes and begins recording survey data. Using this mode the TwinGyro™ can be lowered and left down hole for as long as necessary, for example, before the surveyor returns to begin surveying. TwinGyro user
All-new software In order to utilize the full potential of the TwinGyro™ system, and its sister systems the SlimGyro™ and the rugged version of the isGyro™, entirely new software has been developed. While existing users will still feel at home using the new Surveyor software, the functionality, customizability and data presentation have all received major upgrades. The software includes all-new features that have been added to our gyro systems over the years. This includes improved calibration procedures to exploit the TwinGyro™ capabilities. The processing has been upgraded and optimized for more speed, using our specialist in-house knowledge of inertial navigation and software development. All survey result data can be viewed graphically directly in the software, and there are tools to plot all surveys and average surveys together to give instant feedback on survey results. The data output is compatible with isAnalysis™, our powerful and popular software for analysing, editing and exporting survey data from a range of tools.
No extra overhead There is no extra overhead in running a TwinGyro™ compared to a regular rugged isGyro™ or SlimGyro™. The intelligent software handles both TwinGyro™ components simultaneously so that downloading two surveys over Bluetooth is just as fast as downloading a single survey. The data processing in the isGyro™ was already fast compared to other similar tools. But the processing for the TwinGyro™ benefits from years of further development and now takes literally seconds to process an hour’s worth of data on a standard field PC. The running gear remains the standard 38-mm kit supplied by Inertial Sensing. The TwinGyro™ will fit all running gear and heat shields that fit the standard isGyro™.
Time comparison Utilizing the fast continuous survey mode of the TwinGyro™ makes time comparisons with other gyro systems almost meaningless, since by surveying using a depth encoder attached to the winch it is possible to generate stations ranging from every meter up to every 30 meters or more, without
COMPARISON OF TIMES REQUIRED TO COMPLETE A SURVEY OF THE GIVEN NUMBER OF STATIONS TWICE HOLE DEPTH (METERS)
300
600
1200
STATIONS (3 M) PER SURVEY
100
200
400
TWINGYRO™ (CONTINUOUS*)
10 MINUTES
20 MINUTES
40 MINUTES
TWINGYRO™ (MULTISHOT)
1 HOUR
2 HOURS
4 HOURS
“STANDARD” REFERENCE GYRO
2 HOURS
4 HOURS
8 HOURS
NORTH-FINDING MULTISHOT
13 HOURS
26 HOURS
52 HOURS
* Assuming an average winch speed of 30 meters/minute. Depending on winch this can be faster. 23
/PRODUCT REVIEW
tool which, due to the number of minutes it must spend on-station, is usually used to survey once every 30 meters or more. With the speed of the TwinGyro™ it is possible to survey a hole during drilling more often with little lost rig time. Since the surveys can be run so quickly, compared to conventional gyros, it is not necessary for each rig in a location to have its own gyro. A TwinGyro™ can be economically shared between rigs that are at a single location.
Conclusion
The TwinGyro™ Software resurveying the hole. However, Table 1 gives an indication of just how much time is saved by the TwinGyro™ even in the traditional multishot survey mode. The times shown are the time required to survey the given number of stations twice, to provide a quality check on the survey data.
The clear advantage of the TwinGyro™ in continuous mode is highlighted with bold in the table. With the same 40 minutes of survey data the user can ask for 100, 300, 600 or more stations from the same 1200-meter hole, simply by reprocessing the survey. This gives fast, unparalleled resolution of the hole. Compare this to a north-finding
The TwinGyro™ is proving its worth in mines around the world, with drillers discovering how much time can be saved on getting multiple properly quality controlled surveys in less time than it would traditionally take to run a single survey with competing tools. This leads to less rig downtime while surveying is done and more meters of core drilled in a day. In addition to the saved time and increased core production rate, the fact that the gyro is required for less time in surveying means an operator can share a TwinGyro™ efficiently between rigs on location. No other gyro on the market today can offer such multiple benefits as the TwinGyro™. For further information on the TwinGyro™ and to find a local distributor, please visit www.inertialsensing.com. C
Safety Monitoring and Training Solution
IRIS’s strategically mounted cameras provide complete visibility of your work site’s activity, day and night. It protects your employees in two ways - hard hat detection alerts and security tracking and warning systems keep your employees and your operations safer, while the real site-based footage can be used in training and inductions to demonstrate how to safely complete a task, before employees even step onto site. Visit our website www.iriscorp.net or email info@iriscorp.net for further information.
24
Coring Magazine #6
www.aziwell.com
- Continious oriented B-size core - Real time MWD logging - Easy to operate
MAXIMIZE GEOLOGICAL INFO
REAL TIME MWD LOGGING
B-size core diameter, better recovery and orientated core.
Provides direct sensing of toolface during the run.
SAVE TIME & MONEY
EASY AND SAFE TO OPERATE
MINIMIZE DRILLER HAZARDS
FAST DECENT
Fast penetration due to less bit facing and WOB. Weight and length compatible with standard drills (only+30cm).
No mechanical locking/unlocking of drill rods to tool body. Compatible with standard fast decent drop latch unit.
- First ever fully integrated electronic core orienter - No extensions or adaptors needed - Saves more than 90% rig & crew cost SAVE TIME AND MONEY
ENVIROMENT FRIENDLY
FAST AND EASY TO USE
EASY DATA SHARING
REDUCED DRILLER HAZARDS
FASTER DECENT
Installation and removal without rod handling, reducing crew and rig cost up to 98%.
Fits without special adaptors, extensions or adjustments. No innertube weight/length added and rod handling needed. www.aziwell.com Faster. Deeper. Safer.
No rig emissions or rod- and rig wear due to installation/ uninstallation. Direct data sharing from site to e-mail through a tailored App. No flow restrictions added.
25
/DRILLING FLUIDS
Exploration mining: Looking for gold while staying green by Dani Knezevic, Marketing Consultant at Fordia
The growing number of environmental restrictions and municipal regulations has left drilling and mining companies alike seeking ecologically friendly ways to deal with residues and to reduce their water consumption. Fordia’s customer, Alexandria Minerals Corporation has researched the market to find a solution that complies with environmental regulations, to be able to continue drilling in a sustainable fashion.
Alexandria Minerals Corporation is a growth-oriented Canadian gold exploration and development company with properties located in the mining districts of Val d’Or, Quebec, Red Lake, Ontario and Snow LakeFlin Flon, Manitoba. Alexandria Minerals’s focus is on its flagship property, the large Cadillac Break Property package in Val d’Or, which hosts near-surface gold resources
along the prolific, gold-producing Cadillac Break. The Cadillac Break Property Group stretches for 35 km along the Cadillac Break, a regional fault zone that has produced some 100 million oz of gold since the early 1900s. Arsenic is a natural element distributed throughout Earth’s crust and is sometimes found as an impurity in metal ores. It typically occurs in arsenopyrite, a mineral often associated with gold, where it is a by-product of gold mining operations. To prevent arsenic
Fordia’s Water treatment system
The WTS is easy to transport
The situation
26
contamination of water resources during and after gold mining, regulatory agencies are requiring gold mining companies to comply with increasingly restrictive arsenic standards. In the case of Alexandria Minerals, arsenic had been found in its drill core samples, as well as in the residue and drill cuttings from its drilling operations. To continue drilling and processing drill core, the water the company
Coring Magazine #6
uses requires treatment and cleaning, and the residue requires separation and proper disposal.
The solution Until recently, water treatment systems for the mining industry were very expensive and very large machines with limited efficiency and functionality. Fordia developed a water treatment system (WTS) that was easy to transport and easy to operate. Following a suggestion from Fordia’s Val d’Or team, Alexandria Minerals decided to try the WTS from Fordia. The primary function of the WTS is to separate cuttings from water. Once the water is treated and cleaned, it can be re-used so that a minimal amount of additional water is required. Up to 80% of the water can be recovered and re-used which is ideal for sites where water may be scarce. Once the
cuttings are isolated, they can be disposed of in environmentally approved ways, such as bagging them in special tubes and transporting them off-site.
The results Thanks to Fordia’s WTS, Alexandria Minerals now complies with all local environmental regulations, enabling it to continue exploring new sites. The company was most impressed with the significant reduction in the amount of water required for their operation. They also appreciated the affordability and transportability of the WTS. It is automated, simple to use and requires little training. 'Fordia’s WTS has helped us reduce our environmental impact. Their solution is unique, and their technical support is second to none,' said Philippe Berthelot, Vice President of Exploration. C
About Fordia Fordia is a provider of drilling solutions that include diamond tools, equipment and accessories, has been serving customers in the mineral exploration, geotechnical and environmental industries since 1977. Their goal is to improve drilling performance and make drillers’ lives easier. Visit www.fordia.com for more information about their Water Treatment System and to learn about their other drilling solutions.
WTS units in stock Faster. Deeper. Safer.
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/DIAMOND BITS
It's not just about the diamonds! by Gadi Greenman, R&D Engineer – Metallurgist, Epiroc Exploration Products (part of the Atlas Copco Group)
Diamond bits Impregnated diamond bits are made with a nearly random distribution of small synthetic diamond grit particles throughout a sintered metal matrix. A correctly selected bit should drill a particular rock type at a steady penetration rate, with the matrix wearing away at an appropriate rate to expose fresh diamonds as and when they are needed. This involves a delicate balance of conditions at the drill bit front, which can depend on such factors as the weight on bit (WOB), the rotational speed, the strength
of the diamonds, the rock composition and microstructure, and the amount and composition of the flushing medium. Individual diamonds on the bit face experience a wear history comprising a number of possible stages. The freshly exposed diamond could develop a wear flat by a combination of abrasion and a thermal degradation, it could fracture because of impact or by a process of cumulative fatigue, it could cleave or be worn down nearly flush with the matrix or the diamond could completely pop out from the matrix only leaving a hole where the diamond was
situated. Evaluation under the microscope of the frequency of the different types of diamond wear on drilled bits has shown that the prevalent types of wear are characteristic of certain drilling conditions. So it is important to have a balanced wear of the matrix and the diamonds. Understanding the prevailing wear mechanism of diamonds under different drilling conditions and for different rock formations is fundamental for learning how to minimize certain wear behaviour and to promote desirable wear types on the exposed diamonds (see Figure 1). Having looked at
FIGURE 1 // Four common wear patterns 1
The bit face is evenly worn down with good exposure of sharp diamonds.
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2
Polished bit face with badly exposed diamonds, as a result of either improperly chosen matrix (too hard) or excessive flushing of the bit.
3
Convex wear to the bit face and the outer matrix edge is rounded, as a result of either insufficient flushing or a high concentration of abrasive cuttings.
4
Concave wear to the bit face and the inner matrix edge is rounded, as a result of either excessive feed force or insufficient drilling fluid.
Coring Magazine #6
these common wear patterns, it is important to understand how different drilling parameters, penetration rate, rotational speed, WOB, flushing and rock formation type will affect each other and will result in different bit performance (life and penetration).
Rock drillability The chemical composition and microstructure of different rock formations are important factors when deciding on the proper matrix for an application. As a rock is composed of grains of various minerals, the microscopic properties include mineral composition, grain size, the form and distribution of the grain, and whether the grains are loose or cemented together. Combined, these factors
create important properties of the rock, such as hardness, abrasiveness, compressive strength and density. The drillability of a rock depends on, among other things, the hardness of its constituent minerals, and on the grain size and crystal form, if any. For example, a high quartz content in rock can make the rock very hard to drill. Conversely, a rock with a high content of calcite can be comparatively easy to drill. Also, a coarse-grained structure is easier to drill, and causes very little wear on the drill bits than a fine-grained structure. Consequently, rocks with essentially the same mineral content may be very different in terms of drillabillity. A new range of drill bits was developed to address the challenges encountered during drilling different types of rock formations.
Epiroc’s new matrices have been designed to cover a wide range of drilling applications, which has helped reduce the number of bit types required. This in turn has translated into a reduction in inventory, which makes bit selection much simpler for the driller and reduces the number of bits needed on the job site. The matrices are called SHRED, AZURE – KUBY, LAVA and FERRO, which combine into four types of drilling applications to simplify the bit selection (see Figure 2). SHRED – soft ground - Green Zone (1–4) A drill bit for extremely broken and/or very abrasive formations; its matrix composition is designed for soft to medium hard rock.
FIGURE 2 // Diamond impregnated bit selection chart
Softer brother of AZURE able to cut harder rock. Medium hard to very hard rock. Broken to competent ground. Lava
MEDIUM
MEDIUM
MEDIUM
HARD
Very soft bit for hard to extremely hard rock. Free cutting bit with exceptional life span. Ferro The bit designed specifically for iron ore formation to extend sufficiently life span in that very challenging application. Very good performer as well in regular medium hard to hard formations. Faster. Deeper. Safer.
HARD
VERY HARD EXTREMELY HARD
Pegmatite Basalt Gabbro Diorite Andesite Syenite Diabase Granite Gneiss Quartzite Glassy Quartz Chert Rhyolite Jasperite Taconite
1/1.5
1
2
2/2.5
2
3
3
4
4
6
5
7
6
8
7
9
8
11
9
13
10
15
3/3.5 4/4.5
5/5.5
6
6.5
FERRO
Kuby
SOFT
Common numeric scales 1 - 10 1 - 15
MATRIX
7
7.5 8/9
LAVA
First choice bit for unknown and frequently changing formations. Great overall performer within extremely wide range of rock formation. Medium hard to hard rock. Good for both broken and competent ground.
SOFT
Soapstone Coal Gypsum Shale Limestone Dolomite Slate Sandstone
Mohs hardness
KUBY
Azure
SOFT
Rock
AZURE
Bit for though ground condition for extremely broken and/or very abrasive formations. Soft to medium hard rock.
Rock hardness
SHRED
Shred
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/DIAMOND BITS
AZURE and KUBY – medium hard to hard ground – Blue Zone (5–8) The AZURE drill bit is for unknown and frequently changing formations; great overall performer within an extremely wide range of rock formation types. Its matrix composition is designed for medium hard to hard rock formations, with exceptional performance in both broken and competent ground. The KUBY drill bit delivers even better penetration rates/low torque operation within the Blue Zone range. LAVA – very hard to extremely hard ground – Red Zone (9–10) A drill bit for very hard to extremely hard rock. The LAVA bit is a further improvement of the already popular Excore 8–9, Craelius 9, and Craelius 10 matrices. LAVA bits are designed to provide required penetration rates without compromising bit life. FERRO – iron ore (Black Zone) This matrix is specially designed for iron ore deposits. The matrix is tailored to withstand the abrasiveness and chemical reactions that occur when drilling iron ore formations. FERRO drill bits perform very well in medium hard to hard formations.
Reaming Shell Commonly used reaming shells are set with natural or synthetic diamonds. Some other reamers have tungsten carbide and are either smooth or hard-faced strips. All types are used in medium to hard rock formations; however, the diamond type shells are more often used for deep holes in hard to very hard rock formation where advanced wear resistance is required. It is of vital importance that the life of a reaming shell is significantly longer than normal bit life in any specific formation. As a guide, the reaming shell life should be at least three times the life of the bit, preferably longer. The minimum outside diameter (OD) of the reaming shell should be always greater than the maximum OD of the corresponding diamond bit. If the OD of the coring bit is below gauge then the reaming shell will have 30
SupraSphericals
FIGURE 3 // SupraSphericals for dynamic protection, as marked by the arrows to work hard, which may cause premature failure of the reaming shell. Also, the borehole may have to be reamed to a nominal dimension. The OD of the coring bits and reaming shells should be periodically checked to make sure that the borehole is not undergauged.
All New RS++ Reaming Shell We have completed development of the all-new RS++ Reaming Shell. The new reaming shell demonstrated a 30% increase in lifespan, boosting the number of meters drilled while keeping straighter and gauged boreholes. The RS++ features a reinforced diamond ring surface using natural diamonds, and a unique ‘SupraSpherical’ technology that provides dynamic protection of the surface (see Figure 3). All RS++ reaming shells are leading-edge reinforced with large thermally stable polycrystalline (TSP) diamond pins for better wear pattern control and to maximize diamond volume in highwear zones.
Wear Indicator
Wear indicator
FIGURE 4 // Wear Indicator for easy wear monitoring over time, and when it disappears, that is the indication that the Reaming Shell needs to be replaced. The RS++ Reaming Shell is available in all sizes. In conclusion, the performance of impregnated diamond bits and diamond reaming shells can be improved by using high quality diamonds. However, it's not just about the diamonds: it is essential to learn about rock chemical composition and microstructure, and to consider this information when designing a new drill bit matrix or reaming shell. Our new range of drill bits takes into consideration different types of rock formation to deliver required penetration rates without compromising drill bit life. And, our RS++ Reaming Shell design features a unique SupraSpherical technology that provides dynamic protection of the surface for more life, without slowing down the penetration rate. Epiroc Exploration Products, a subsidiary of Atlas Copco Group, develops and produces innovative drill rigs, rock excavation and construction equipment, and provides worldclass service and consumables. The company was founded in Stockholm, Sweden, and has passionate people supporting and collaborating with customers in more than
Also, the new RS++ features a patent pending
150 countries. Epiroc is among the world’s
Wear Indicator bar to identify how much
leading manufacturers of core drilling
life is remaining (see Figure 4). This helps to
equipment. We have supplied our market
maintain better control of the borehole OD.
with high performance products over many generations. Visit www.epiroc.com. C
The Wear Indicator gradually wears away
Coring Magazine #6
/TOPIC OF THE ISSUE: CASE STUDIES SPECIAL
The Grouting Project Vale’s CCM project South Mine in Canada by Don Black, Mining Operations Coordinator at Gyrodata
Gyrodata is the leading provider of high accuracy well bore placement technology for the global oil and gas industry. The company’s gyroscopic wellbore surveying, logging and directional drilling technologies are designed and manufactured inhouse. Gyrodata has offices in approximately 50 countries, which enables the company to provide its world class tools and services in every major strategic market in the
Foraco’s drillsite (right), Gyrodata’s lab on wheels (left) and the BG Drilling’s CWT directional drilling system (below).
Purpose of the project Vale’s Copper Cliff South Mine (CCM) in Sudbury, Canada has been idle since 2007.
a 90% water inflow reduction and to achieve this, the holes had to be precisely drilled with virtually no deviation. The hydrology report from the test borehole
world.
As part of the company’s plans to reopen
In 2015 Gyrodata expanded,
the mine, a project was established to seal
with the opening of an
two important ventilation shafts (raise 810
existed to a depth of 400 m (1300 ft) and
and raise 830) from artesian water. The
therefore required a grouting job of 1.5 m
project was a pressurized grout program
(5 ft) above to 1.5 m (5 ft) below in numerous
that involved drilling a number of vertical
zones along the raise. It was expected that
holes with a circular pattern around the shaft
whichever contractor was hired would
excellence to the mining
to a depth sufficient enough to seal off the
review these findings prior to executing the
community.
artesian water inflow. The aim was to achieve
pressurized grout program.
office in North Bay, Ontario, to provide the same high level of service and
Faster. Deeper. Safer.
indicated that the water-bearing structures
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/TOPIC OF THE ISSUE: CASE STUDIES SPECIAL
Figure 1 CCS Grouting 830. The four N-size boreholes: P1 1380040, P3 1380030, P4 1380020 and P2 1380010
Figure 2 CCS Grouting 810 and 830. Holes are positioned around the shafts in a circular pattern.
Selecting a team Having established that action was required, ACT (Advanced Construction Techniques Ltd) was called in to help. ACT is a specialized grouting contractor and the project scope was a perfect fit. ACT gathered a team of companies, and each one was given well-defined responsibilities for their participation in the project. Foraco Canada was the drilling contractor chosen to drill the pilot holes and then ream out to the final diameter. The best rig for the job, a VD 5000, was brought on-site in no time and the best drill crew came along with it. The grout holes had to be drilled to within the 0.91 m (3 ft) allowed deviation from the vertical axis along the whole path. To keep the holes within their limits to a high degree of accuracy would be a challenge to say the least and critical to the success of the grouting. Gyrodata, utilizing their 3 axis CAAT Northseeking Gyro and BG Drilling Solutions, utilizing their Continuous Wedging Tool 32
(CWT), along with their local partner i3DDS – a directional drilling provider, were called in to take on this challenge.
CCS Grouting 830 Using the center of the shaft as the reference point, four NQ holes were drilled to approximately 365 m (1200 ft.). The plan was to start with the northern borehole (P1 1380040), followed by the southern (P3 1380030), then the western (P4 1380020) and, finally, P2 1380010. The southern hole, P3 1380030 (Figure 1) is a good example of the work done by all parties involved. The southern borehole, ID: P3 1380030 The NQ hole was drilled by Foraco to 336 m (1100 ft.). The average daily production rate was 30 m (100 ft) per shift. Gyrodata, via the direct reading conductor, e-line, surveyed the hole every 15 meters to closely look at the hole position. When the hole advanced to 105 m (345 ft), it had reached two thirds of its allowable limit, so BG Drilling together with i3DDS, executed their first correction. The
CWT was oriented by Gyrodata via Gyro Tool Face . The correction succeeded and turned the hole to a south-east direction. At 240 m (790 ft), the hole was getting close to the southern border and again using the CWT it was successfully guided towards the vertical axis. Quickly afterwards, the natural trends took control and the hole swung to the east. At 315 m (1035 ft), the hole was getting closer to the eastern border, and the third and final correction was performed. Soon afterwards, at 336 m (1100 ft), the hole was completed.
Project summary The drilling part of the project (raises 810 and 830) was successfully concluded in 45 days and within the planned schedule. A total of 2200 m (7220 ft) was drilled with 130 gyro surveys, 20 Gyro Toolface orientations, and 20 corrections with the CWT directional drilling system. Despite the tough path limitations, good control over the hole trajectories was achieved, resulting in all holes being kept within limits and successfullyconcluded (Figure 2). C Coring Magazine #6
About Advanced Construction Techniques Ltd
About Foraco Canada
Advanced Construction Techniques Ltd is a specialty geotechnical contractor offering a complete range of ground modification construction methods to the geotechnical industry; their specialty being the installation of grout curtains. The company was formed in 1992 to provide specialized construction services to the geotechnical industry. In 2008, Advanced Construction Techniques, Inc. was formed in the United States in order to better serve our US-based clientele. ACT has worked throughout North America and in some of the harshest winter environments that the continent has to offer. The company has been fortunate to have worked on some of the most prestigious geotechnical projects in the region, including three of the largest dam foundation remediation projects ever completed.
Foraco Canada is a subsidiary of Foraco International SA, a publicly traded company based in Marseille, France. Foraco provides innovative solutions for mining, and water projects across 22 countries and five continents. With the third largest global fleet of drilling rigs, best-in-class safety standards and a versatile, well-trained international workforce with a proven track record in geologically complex formations, they are well positioned to satisfy the needs of their customers operating around the world.
About BG Drilling and i3DDS BG Drilling Solutions is an international directional drilling service provider working for the mining and mineral exploration industries. BG Drilling’s aim is to make its directional drilling services affordable, reliable and suitable for any project. BG Drilling started active operations in 2012 and currently has representation in Europe, Africa and both South and North America. In Canada, BG Drilling Solutions is partnered with i3 Directional Drilling Solutions who provide a full range of directional drilling and consulting services. BG Drilling’s expertise in evaluating and planning directional drilling boreholes is one of the best in the industry and its borehole navigation system, CWT has proved reliable and robust on various projects worldwide.
Exploration through Remediation
The Geotech Group of Companies is here to offer our drilling services through each stage of the mining lifecycle; exploration, feasibility, construction, operation, monitoring, decommision, and remidiation. Your one-stop-shop for everything DRILLING.
1-888-228-1234
Faster. Deeper. Safer.
www.geotechdrilling.com
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/TOPIC OF THE ISSUE: CASE STUDIES SPECIAL
Capital Drilling improves the hole success rate by 35% in Bor, Serbia by Brian Rudd, Executive Director of Capital Drilling
The surface lithology at the deep-hole directional project, based in Serbia in Eastern Europe, had proven difficult to drill prior to Capital Drilling’s (Capital) involvement. Miocene rock, up to 300 m in depth in some areas, had contributed to the problem of holes not reaching client requirements and the low 50% hole success rate on directional targets. Capital significantly improved results for its client by implementing a number of measures including: improving equipment capability; investing in the latest consumables technologies; specifically employing world-renowned drillers for the project; and providing best practice training to local drill crews.
Capital drill site in Bor, Serbia 34
Capital imported specialized equipment and larger drill rigs from around the world to ensure there was adequate capacity to reach the deep directional targets. Drilling mud centrifuges were also used - recycling drilling fluids significantly reduced usage of mud additives and water on-site. By working closely with consumables suppliers, Capital introduced high quality, leading technologies suitable for the challenging lithology. In particular, cementing processes and mud programs were formulated for the difficult conditions, and downhole failures were reduced as a result. Hole stability improved notably, production rates increased and hole completion improved by 35%.
Due to the depths and complexities involved, Capital specifically employed worldrenowned deep-hole drillers and supervisors for this project. The team had extensive experience in many global deep-hole directional programs, which was leveraged to address drilling challenges. The team also provided invaluable support and training in best practice drilling methodologies to the company’s local drilling employees. The company’s approach to the project delivered several benefits to the client. Most importantly, by improving hole success rates, the client was able to achieve specified targets that were required to meet stringent ore body definition criteria, which they had not previously been able to attain.
Improved hole stability resulted in quality core samples Coring Magazine #6
In addition, the introduction of mud recycling equipment delivered real savings to the client as a result of the significant reduction in the amount of drilling muds that were used. Productivity improved substantially, with crews achieving greater than 28 m per day on several machines at depths between 1800 m – 2200 m. On one hole (greater than 2200 m), the required total depth was reached 11 days earlier than client budget, and progress exceeded client expectations by four meters per day. The improved hole stability reduced hole abandonment and enabled two of the deepest holes to be completed to depths greater than 2260 m, with capacity to continue drilling. The company’s success demonstrates a number of its cultural approaches to any project - a willingness to go the extra mile to achieve client targets, a professional drilling culture and an uncompromising commitment to safety. As stated, Capital has an uncompromising commitment to safety, regardless of location or local standards. A modern safety culture and structure was introduced to the site— a first for drilling projects across this country.
The drill site and the mud recycling equipment The global safety standards implemented on the project included Safe Work Procedures (SWPs), Job Safety Analysis (JSAs) and safety monitoring and reporting structures. As a result of the technological, technical, organizational and safety efforts made on the project in Bor, Capital is proud to announce the following achievements: • Improved hole success rate by 35%; • Enabled client to meet stringent ore body definition criteria, not previously attainable;
•
•
• •
Improved hole stability, enabling holes to progress that would otherwise have been abandoned; Drilled deepest holes on-site (greater than 2200 m) to required total depth, despite challenging conditions; Exceeded client’s expectation by four meters per day on one hole; Delivered cost savings to client attributed to a reduction in drilling muds used. See www.capdrill.com C
SEE EXACTLY WHAT’S HAPPENING BELOW THE SURFACE WellForce International’s Borehole Management Software shows a unique 3D view of the trajectory of a drill hole - it will also deliver a deviation plan to realign the borehole to target if required. This provides complete visibility of the progress of your drilling program, and importantly ensures targets zones are reached on every hole. The software forms part of WellForce’s complete range of rig-site solutions, that include down-hole tool rental and on-site surveying and geophysical logging services.
Faster. Deeper. Safer.
CONTACT OUR EXPERT TEAM:
+1-512-993-6938 | info@wellforceint.com www.wellforceint.com
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/TOPIC OF THE ISSUE: CASE STUDIES SPECIAL
Master Drilling breaks new scientific ground with the University of Pretoria and offers new added-value service to mineral exploration projects by W. C. Olivier and F. J. Stassen, Geologists at Master Drilling The Makganyene glacial deposits in the Northern Cape in South Africa are the remnants of one of the most profound climate change events in the Earth’s history, which occurred approximately 2.4 billion years ago, leading perhaps to the total glaciation of the Earth and its oceans. The event was followed by large lava flows, a significant rise in oxygen levels in the atmosphere and a dramatic decline in CO2 levels. Fresh core samples extracted from the deposits will help scientists to better understand this climate change event, especially because up until now only weathered surface samples have been available. The information gleaned from the core samples could prove invaluable to scientists studying climate change models today. Master Drilling, an international technology-driven drilling company based in South Africa, is working on this exciting large-scale project in collaboration with the University of Pretoria. Renowned academic geologist, Professor Wladyslaw Altermann, Head of the Department of Geology at the University of Pretoria and the Kumba-Exxaro Chair, approached Master Drilling in early 2017 about drilling a historical core hole through the Ongeluk lavas, Magkanyene (glacial rocks) and the Koegas Formation, with a three-fold motivation. First, information on the contact between these formations in the area is nearly nonexistent, and the drilling would, among other things, better the understanding of the stratigraphic correlation of these Transvaal Supergroup rocks to other lithologies in central South Africa, as well as in other areas, such as Thabazimbi and the eastern Bushveld. Second, the age (2.5–2.2 billion years) and the depositional environments of the rocks in the area are not well understood, and the fresh samples would provide geologists with an opportunity to study the geological history of these formations in hitherto unavailable detail. 36
Third, obtaining such information would also carry potentially valuable economic implications; the stratigraphic correlation will contribute much needed knowledge of the mineral-bearing potential of these formations. Prof Wlady (as affectionately referred to by his peers) sited the borehole close to a dry river bed containing a unique example of preserved pahoehoe lava flow structures within the Ongeluk Formation of lavas in the western portion of the Transvaal Supergroup.
This project is the first collaboration of its kind between the mining industry and a university in South Africa. Although there have been some scientific drilling programs of a similar nature in South Africa, such as the drilling of the Karoo rocks by CIMERA (Center of Excellence) and the University of Johannesburg, these were dependent on international funding. This is the first multi-million Rand scientific drilling project that is driven, planned, funded and executed utilizing exclusively local expertise through the collaboration of a South African university and drilling company (Master Drilling),
Prof Wlady Altermann (University of Pretoria) and farm owner, Oom Peet with the Master Drilling team Coring Magazine #6
with assistance from the Kumba Iron Ore mine at Kolomela. As a unique example of a wholly South African collaboration between investors, industry and academia, this project holds great promise. The project will create opportunities for young scientists to complete PhD, MSc and BSc degrees. The positive implications of increased international publications, and the spread of knowledge and expertise are tremendous. The funding of the project by Master Drilling is a good example of industry involvement in basic and applied science. For now, the core, containing yet-to-be discovered secrets of the Earth’s history, is safely stored and will be analyzed by Prof Wlady, his team and the geological community around the world.
One-stop drilling solutions Talking about core samples, Master Drilling has always recognized that the core collected from drill holes is the most important element of their work. With this in mind, the company developed a new value-added service that it calls ‘integrated core process flow management system’, which it provides to its clients’ exploration drilling projects. This system includes a range of other sub-services, such as the onsite QA/QC of
drilled core, core transportation and delivery to the clients’ core yard, and streamlining and eliminating bottlenecks in the logging, sampling and dispatching of processed exploration core. Since mid-2014, Master Drilling has provided integrated core process flow management systems to one of its principal clients in the Northern Cape. At one point, the exploration drilling project encountered a bottleneck when core trays had to be packed on and off stands. Master Drilling’s scribes took on this task on top of their other responsibilities of delivering core samples to the client’s core yard, validating the core trays, and measuring and recording core recoveries prior to geological logging and sampling by the client. As a result, the client’s geologists were freed from logistical, and, to a certain extent, quality concerns relating to the processing of their core, and they were able to focus on the scientific work, so the throughput of geological information gathered within the project was maintained. For all clients, core samples are transported on a customized truck fitted with a specialized core holder frame and rubber shock dampeners that ensure minimal disturbance of the core samples during transportation.
As part of its principle of giving back value to the local communities where Master Drilling operates, workers are trained by qualified Master Drilling geologists to mark core and core trays, calculate and check core recoveries, and check the overall quality of the core prior to the client geologists logging and completing the final QA/QC checks on the core. General workers are trained to understand the mechanisms of core-loss, -gain, -grinding and other physical attributes resulting from drilling. This facilitates the rapid detection and resolving of any core quality issues. To ensure its continued success, Master Drilling employs full-time geologists on relevant projects. The integrated core process flow management service has proven to be efficient and beneficial to the client, and it has created a successful collaborative link between exploration drillers and exploration geologists. This service truly emphasizes Master Drilling’s vision: ‘We challenge the status quo to provide our clients with specialized, adaptive one-stop drilling solutions’, by not only providing a traditional drilling service, but also fulfilling the additional value-chain needs of its clients See www.masterdrilling.com C
Master Drilling's geologist, Mlamleli Chopela and trained scribes checking the quality of core. Faster. Deeper. Safer.
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/TOPIC OF THE ISSUE: CASE STUDIES SPECIAL
Volcanic cores from Iceland’s youngest island by Savannah Adkins Digital Marketing Co-Ordinator at Rig Source Inc.
Drilling into the Surtsey Volcano Formed only 50 years ago from volcanic eruptions below the sea floor, Surtsey Island is a natural habitat protected by UNESCO as a World Heritage Site for scientific research. Named after a fire jötunn known as Surtr in Norse Mythology, this island, located just south of Iceland, gained national attention during its fouryear eruption phase in the 1960s and has since contributed a great deal to the study of our earth’s biological processes. Scientists monitor the island exterior for physical changes, and carried out the original internal survey on Surtsey in 1979 when the first core sample was extracted. Now, 38 years later, after decades of planning and coordination, scientists have drilled into the volcanic island again to recover a secondary set of samples for comparison, while also drilling a hole through the volcano’s main vent to discover further findings. 38
CS1000 core drill rig rental To drill into Surtsey, scientists hired DOSECC Exploration Services, a core drilling company specializing in innovative solutions for scientific drilling operations. DOSECC is committed to scientific interests and they engineer creative strategies to ensure the best equipment is used to meet the unique goals for drilling projects around the world. For the Surtsey drilling project, DOSECC reached out to Rig Source Inc. for an Atlas Copco CS1000 drill rig rental. DOSECC was confident the CS1000 rig supplied by Rig Source would be the best core rig for the project due to its compact size. ‘We currently don’t own a drill comparable in size to the CS1000 and we needed something small and compact for shipping and simplistic assembly on the island,’ states Steve Cole, Drill Foreman at DOSECC.
Rig Source recently expanded their drill rig rental fleet to include core drill rigs after the economic downturn in the core drilling industry lead to an increased demand for rentals. ‘We have found core drill rig rentals provide contractors the flexibility to use various pieces of equipment while reducing the risk associated with ownership,’ says Mike Crimaldi, Owner of Rig Source. ‘Renting the CS1000 core drill rig from Rig Source provided us access to the exact sized rig we needed for the Surtsey drilling project and greatly reduced our overall expenses for the project,’ states Beau Marshall, Operations Manager at DOSECC.
Drilling preparation Long-time partners in the drilling industry, Rig Source and DOSECC teamed up to ensure the CS1000 drill rig was in tiptop shape and prepped for drilling on the remote island. Rig Source performed a full Coring Magazine #6
Night drilling on the Island of Surtsey
Aerial view of the Island of Surtsey maintenance check and updated service to the rig prior to the start of the project, and provided DOSECC with tooling and back up parts to cater for any unplanned issues that might arise while on the island. DOSECC then sent Cole along with Lead Driller, Justin Blouin to Rig Source’s Elburn, Illinois facility to disassemble and label the CS1000 for its shipment to Surtsey. ‘It was imperative that we had our drillers familiarizing themselves with the rig prior to arriving on the island because once on the island these guys had minimal access to support while reassembling the CS1000 for drilling,’ says Marshall. When the unit arrived at Surtsey, the drillers were able to quickly reassemble the rig with the help of a helicopter for piecing the large parts together. ‘The extensive prep work completed by Rig Source and DOSECC provided a seamless rebuild on the island, and we had absolutely no issues connecting the hydraulics which saved a great deal of time,’ Blouin confirms.
CS1000 operation and handling Operation of the CS1000 drill rig commenced on August 4, 2017 and the rig ran around the clock until project completion on September 4, 2017. During operations, DOSECC conquered many scientific milestones for the Surtsey project and ultimately met their projected drilling goals. Most notably, the CS1000 successfully drilled three holes into Surtsey. The first hole was drilled for a 151 m hole while the second hole made it to a vertical depth of 190 m to serve as a long-term monitoring well. The third hole was distinguished for being the first angled hole drilled into and through the volcanic vent, and was terminated at 354 m. DOSECC’s drilling team was extremely satisfied with the operation and handling of the CS1000 core drill rig rental. ‘The drill performed above and beyond any of
our expectations. Absolutely no leaks or problems of any kind which is truly unheard of,’ asserts Blouin. With the help of Rig Source and so many more, DOSECC successfully captured some unique core samples from the volcanic island of Surtsey. The information obtained from these core runs can be used and studied for years to come. According to Beau Marshall, ‘Everybody connected to Surtsey is very satisfied with the outcome of this drilling project. We thank Rig Source for providing a reliable CS1000 drill rig along with outstanding customer service as it afforded us the ability to reach our goals.’ ‘Following the Surtsey drilling project from start to finish was remarkable for everyone at Rig Source, but to say that our company, Rig Source provided the drilling equipment used to pierce the main vent of Surtsey is just extraordinary. We’re honored to have been chosen by DOSECC as their drill rig supplier for this incredible project,’ states Crimaldi. C
For further details • • • •
www.icdp-online.org/projects/world/europe/surtsey/ www.surtsey50years.utah.edu/ www.facebook.com/Dosecc-Exploration-Services-LLC-284723191871131/ www.facebook.com/surtsey50years/
Faster. Deeper. Safer.
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Diamond Drilling Services Diamond Core Drilling DRILLING IS OUR BUSINESS foraco.com info@foraco.com 33 0 4 96 15 13 60 33 0 4 96 15 13 61
For over 50 years, FORACO has provided mineral and water drilling services around the world. We operate in 22 countries with the best-in-class equipment and workforce. For Canada, Australia, Russia, Brazil, Africa, and more
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With facilities across Canada and Western Europe, Hy-Tech has been delivering superior drilling services for over 25 years. When failure is not an option, we’re the company you turn to. For Canada, Portugal, Spain, USA
DDH1 DRILLING Phone +61 08 9435 1700 admin@ddh1.com.au www.ddh1.com.au Australia
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DRILLCON AB Phone +46 587 82820 Fax +46 587 311895 drillcon@drillcon.se www.drillcon.se Scandinavia, Portugal, Spain
PRIORITY DRILLING LTD. Phone + 353 (0)90 967 6117 Fax + 353 (0)90 967 6269 info@priority.ie www.prioritydrilling.ie United Kingdom
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GEOSOL Phone +55 (31) 2108-8000 geosol@geosol.com.br www.geosol.com.br Brazil GÜNZEL DRILLING Phone 264 81 122 8615 guenzel@guenzeldrilling.com www.guenzeldrilling.com Namibia
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DEVICO Phone +47 72870101 devico@devico.no www.devico.com International
Coring Magazine #6
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Drilling Equipment & Accessories Drill Rigs and Accessories BARKOM Phone 90-312 385 60 50 Fax 90-312 385 35 75 info@barkomltd.com www.barkomltd.com DISCOVERY DRILL MANUFACTURER (DDM) Phone 1-506-542-9708 Fax 1-506-542-9709 info@discoverydrills.com www.discoverydrills.com DI CORP Phone +1 (780) 395-5036 belinda@di-corp.com www.di-corp.com DRILLCO MINING AND EXPLORATION Phone 1 705-476-3629 S.Brisson@drillcomining.ca www.drillcomining.ca/ DURALITE DIAMOND DRILLS Phone 709 263-7221 Fax 709 263-7231 duralitedrills@nf.sympatico.ca www.duralitediamonddrills.com
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Diamond Products
pilotdiamondtools.ca sales@pilotdiamondtools.ca +1 705 497 3715 +1 705 497 3714
PARTNER OF THE WORLD'S BEST DRILLERS supplier of world-class diamond products to the diamond drilling and construction industries. Business models and technology have changed over the years, but Pilot Diamond Tools' core business values have nota.
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CARBON DRILLING PRODUCTS Phone (289) 291-3861 sales@carbondrill.com www.carbondrill.com
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Coring Magazine #6
Drill rods & Casings SPECIALITY CHEMICALS, PARTS AND ACCESSORIES Di Corp focuses on all aspects of your industrial project; Mineral Exploration, Drilling Fluid Supply, Cementing & Stimulation, Mining, Research & Development, Testing Equipment, and all Small Bore Drilling disciplines.
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ATLAS COPCO EXPLORATION PRODUCTS Phone +46 (0) 223 46109 Fax +46 (0) 733 054343
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Wedges FORDIA Phone 514-336-9211 Fax 514-745-4125 info@fordia.com www.fordia.com
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Miscellaneous Drilling Fluids ENVIRONMENTALLY SAFE DRILLING FLUIDS & LUBRICANTS matexdrillingfluids.ca orders@matexdrillingfluids.ca +1 403 720 7044
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Health & Safety
44
Coring Magazine #6
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45
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