Goldex Ore Storage Facility (Dubuisson (Val-D'Or))

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The ore storage and handling system is designed on the basis of supplying 24 hours of live capacity to the milling facility, thereby providing a short-term buffer between the mine and mill. Ore is crushed underground by the primary jaw crusher. Crushed run-of mine (ROM) ore from underground is skipped to surface and dumped into a 250-tonne hopper. Ore is fed from this hopper onto a 1,067-mm-wide conveyor that in turn feeds a secondary cone crusher, which crushes the ore to 95% minus 50 mm. The crushed ore is conveyed to a stockpile covered by a geodesic dome-type enclosure that can cover a 7,000-tonne live capacity conical-shape stockpile. The total stockpile capacity is approximately 30,000 t; the stockpile dead zone area is accessible to heavy mobile equipment. The conveying system is designed to handle up to 435 tonnes/hour. Ore is reclaimed from underneath the stockpile via three 1,219-mm x 4,877-mm apron feeders. Each feeder is designed to handle the total mill feed throughput of 290 tonnes/hour. Normal operation sees all feeders operating at a reduced rate. The feeders discharge onto the 1,067-mm x 362.7 m SAG mill feed conveyor. The throughput is controlled and registered via a weightometer installed on the feed conveyor.