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SPECIALIST EQUIPMENT


CONTAINMENTstrategy O


Silver mine controls dust and spillage using modern conveyor technology


ne of the leading experts in the design and manufacture of conveyor components has helped the largest


primary silver producer in North America to mitigate fugitive material and increase safety by upgrading the company’s bulk handling system. Coeur Mining was experiencing


excessive dust and spillage on the conveyor leading from the crusher to the surge pile, which lowered air quality, required fi ve to 10 man-hours per day to clean, and caused unscheduled downtime from premature equipment failure. T erefore Martin Engineering


installed a transfer point load zone using Evo Conveyor Architecture that contains dust and spillage by centring and controlling cargo, resulting in reduced maintenance, improved workplace safety and a lower cost of operation. Coeur Rochester, located in


Pershing County, Nevada, produced an estimated yield of 5.0 million ounces of silver and more than 50,000 ounces of gold in 2015. T e massive site is spread over 10,800 acres (43.7km2


), and includes a network of


20 conveyors, originally designed and installed in 1986. Given the system’s age and the amount of usage over nearly 30 years in service, company offi cials wanted to fi nd ways to update the conveyors with the most advanced technology to raise effi ciency, reduce dust and spillage, and contribute to improved safety.


Where to start Conveyor B was chosen as the starting point with the most potential for improvement, a 48in wide belt running at 386 fpm, with a 40ft chute wall. With a troughing angle of 35°, Conveyor B handles nearly 1,500 TPH of rock that has been sized to less than 4in, carrying it from the secondary cone crusher to the surge pile stacker. It’s loaded directly by a vibrating grizzly feeder under the chute and the secondary crusher. “T ere’s a long fall going to the


secondary crusher, and that creates a huge disturbance in the material fl ow,” explains crusher operations/fi xed plant maintenance superintendent, Wayne Maita. “We were seeing a lot of dust and spillage in that area. It not only aff ected the air quality and presented a potential safety risk from accumulated material on fl oors and structures, but it also meant putting operational


Coeur Rochester produced 4.2 million ounces of silver in 2014, along with 44,888 ounces of gold


26 www.engineerlive.com


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