Engineering & Mining Journal

JUN 2019

Engineering and Mining Journal - Whether the market is copper, gold, nickel, iron ore, lead/zinc, PGM, diamonds or other commodities, E&MJ takes the lead in projecting trends, following development and reporting on the most efficient operating pr

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Page 56 of 115

FANS AND VENTILATION JUNE 2019 • E&MJ 55 "Increased electrification in mines, particularly the transition to electric vehi- cles, will get rid of many diesel machines, which will help air quality a lot, but there will still be a need for ventilation systems in mines to keep them free from dust," Nyqvist said. "Also, as mines go deeper, we need to regulate temperature. Some mines today have a temperature of 35°C, meaning that a lot of air is still required to maintain a healthy working environment." With the improvement in the capabil- ities of next-generation batteries, there has been a huge increase in interest sur- rounding electric vehicles and the bene- fits that electric fleets can deliver for un- derground mines. "Electric fleets will be a great benefit to reduce emissions of gas, diesel partic- ulate and heat, which will have tremen- dous benefits in terms of the health and safety of our people," Allen said. "The use of electric machinery will also change the criteria of ventilation design in com- parison to that of diesel equipment." Ventilation systems typically consume 50%-70% of the energy used by a mine site. The use of electric equipment offers the potential to employ smaller raises and fans, which reduces mine capital costs, a reduction in operating costs through low- er demands on ventilation systems, and less refrigeration and heating, all of which lead to a smaller environmental footprint. "Without electric vehicles, some orebod- ies are not economically feasible to mine due to the energy intensity required to ven- tilate the workings," Gribbons explained. "Kirkland Lake Gold's Macassa mine and Glencore's Onaping Depth are two excellent examples of the economic reason to use much more expensive electric vehicles in- stead of a conventional diesel fleet." German manufacturer, SMT Scharf, was one of a number of companies that intro- duced battery-electric mine vehicles at the bauma 2019 tradeshow in Munich in April. Scharf's new E-Cruiser is available in various body variants from pickup to sta- tion wagon, with a 1-metric-ton (mt) pay- load and all-wheel drive capabilities. The larger of two available batteries allows a range of 120 km and can be recharged in just two hours. "The underground test of several units shows that the range is sufficient for a complete shift, and that charging can take place during the shift change," said Jens Steinberg, director of sales and mar- keting at SMT Scharf. While enthusiastic about the new product, Steinberg is realistic about the impact of electrification on mine ventila- tion. "The electrification of fleets or im- provement of mine ventilation is certain- ly not an end to itself," he said. "Mine operators will need to implement both measures to achieve the primary goal, which is to minimize employee exposure to exhaust gases, and to reduce overall CO 2 emissions from their operations." With modern lithium-ion chemistries and the use of integrated battery manage- ment systems, off-gassing is no longer an issue with next-generation batteries, as was the case with older lead-acid formulations. "Local regulations for the ventila- tion of mines prescribe certain amounts of fresh air per kilowatt of diesel power, which, in principle, are no longer re- quired for electric vehicles," Steinberg explained. "Especially in deeper mines, ventilation must not only ensure that the exhaust gases are purified, but also that Hermann Paus Maschinenfabrik GmbH Tel.: +49 (0) 5903 707-0 E-Mail: Paus Scalers are specially designed for use in mining and tunnelling. \HDUVRIH[SHULHQFHDUHDYDLODEOHIRU\RXULQGLYLGXDODQGHFLHQWVROXWLRQ Showing their advantages even in challenging enviroments. You can count on them. Utilization Advantage

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