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A total of 3,400 tpd run-of-mine will be processed at the Windfall site. The process plant consists of primary crushing, followed by a grinding circuit consisting of a SAG mill (24’ x 11’, in closed circuit with a pebble crusher) and ball mill (17’ x 31’, in closed circuit with cyclones - SABC circuit). A gravity circuit followed by leaching recovers coarse gold from the cyclone underflow, while the cyclone overflow, at a P80= 37 microns, is treated in a carbon-in–pulp (“CIP”) circuit, followed by SO2/air cyanide destruction. Gold and silver are recovered in an adsorption-desorption-recovery (“ADR") circuit and electrowinning (‘’EW’’) cells, with gold room recovery and production of dore bars. The process plant is followed by a tailings filtration plant with filter press to produce paste backfill to send underground and/or dry material for filtered tailings stack storage. The process plant is estimated to average 93.1% payable gold recovery and 83.3% for silver over the LOM. The process plant building also includes mine and mill offices, a dry, warehouse, and first aid office.
The process plant is followed by a tailings filtration plant with filter press to produce paste backfill to send underground and/or dry material for filtered tailings stack storage.
The process plant is estimated to average 93.1% payable gold recovery and 83.3% for silver over the LOM.
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