CLEAN MINING
APPROACHING
CIRCULARITY
IN MINING
The role of sensor-based sorting in future green mining
By Mathilde Robben
E
very year we create more than 2 billion tons of waste worldwide. In 2019, the United States’ total primary energy consumption approached 100.2 quadrillion Btu. Both are expected to continue to increase at a sobering rate. These figures reflect the key trends we are facing and need to address urgently, such as climate change, urbanization, population growth, the fourth industrial revolution, rising per capita consumption, and decreasing resource availability. The mining industry is among the first links of the supply chain, while also being a large consumer of water, chemicals and energy (up to 11% of global use). For this reason, it has a key role to play in the pursuit of better resource management, a low-carbon future and increasing circularity of the economy. A circular economy is one that is restorative and regenerative by design. It looks beyond the take-make-waste extractive industrial model, and aims to redefine growth, focusing on positive societywide benefits. It is based on three principles: design out waste and pollution; keep products and materials in use; and generate natural systems. The time when mining could be labeled as a dirty industry is over. Mining companies focusing on green mining practices, which include the use of renewable energy and implementing a minimum waste philosophy, are responding to the energy transition and the shift from a linear to a circular economy. They are under pressure to operate more sustainably by increasing legislation and regulations aimed at reducing the industry’s environmental impact, as well as growing resource scarcity. In addition, they need to adapt, as their customers move towards a circular economy approach. The demand for sustainably mined products and their price is expected to rise, as companies in all industries aim to reduce their emissions footprint. A growing number of operations are turning away from fossil fuels and moving to renewable energy sources. This is driving the requirement from
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MINING JOURNAL
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mining and mineral processing equipment suppliers to develop innovative and sustainable equipment. Sensor-based sorting The mining industry must be part of the solution to the challenges of the future, because primary resources will continue to be needed. While the circular economy approach fosters sustainable processes along the entire life cycle of products, so that the resources remain in use for as long as possible, complete circularity cannot be achieved. The Sustainable Development Goals that all 192 member states of the United Nations have set out to achieve by 2030 are driving the development of green technologies, which use a variety of minerals. For example, solar panels, wind turbines and batteries cannot be manufactured without primary resources or critical minerals. The role of the mining industry is to ensure that whenever these raw materials are needed, their footprint is as small as possible. It is necessary to find ways to maximize the efficiency of mining and processing operations and to minimize the use of energy, water and chemicals, while reducing waste as much as possible. This is precisely what the innovative and disruptive field of sensor-based sorting technology is aiming to achieve, so that the unavoidable extraction of resources has as little environmental impact as possible. It is well known that mining generates considerable volumes of waste rock, tailings, mine water and chemicals. Effective waste management based on a circular economy approach, combined with practices that turn waste into value, can be a solution to address the limited metal supply, for example. This can be achieved with sensor-based ore sorting. It can be used as a separation process for coarser grain sizes before the application of fine comminution and separation technologies. It can be applied www.canadianminingjournal.com
2020-10-05 5:53 PM
