Copper Mountains concentrator was commissioned in May 2011. The circuit consists of a 34 x 20 EGL SAG mill, a Raptor 900 pebble crusher and two 24 x 396 ball mills. Each mill is equipped with a 2 x 8500HP dual pinion drive system. The plant was designed to process 1585 h mtpof SAG feed. From
The Copper Mountain mine is located about 20 km south of Princeton, British Columbia and 300 km east of the port of Vancouver. The Copper Mountain mineral claims cover approximately 18,000 acres and consist primarily of 135 crown grants, 176 mineral claims and 14 mining leases.
The Copper Mountain mill flowsheet is currently a conventional two stage crushing, SAG, pebble crusher, ball milling, and sulphide flotation circuit design. The current capacity supports 40,000 t per day of ore processing. The 45ktpd Expansion that is currently underway will add a third ball mill in parallel with the two existing ball mills.
By expanding the mills throughput to 65,000 tonnes a day, Copper Mountain says the mine will have an estimated after tax net present value of US$1.01 billion with an eight per cent discount rate, assuming prices of US$3.15 per pound of copper, US$1,700 per ounce of gold and US$22 per ounce of silver.
The new mill expansion scenario features a 21 year mine, producing an average of 106 million lb. of copper and 60,000 oz. of gold annually, at cash costs of US$1.21 per lb. over its life. The initial capital cost for the 65,000 t/d expansion is estimated at US$123 million, plus a 25% contingency, for a total of US$148 million.
A stamp mill is a large mechanical device used to crush ore and extract the desired metals from the host material. It uses heavy steel stamps to crush and break apart material, releasing the valuable gold from worthless rock, allowing for the extraction of gold for further refining.
Bald Mountain Gold Mill, Nevada Gulch at head of False Bottom Creek, Lead, Lawrence County, SD HAER SD,41 LEAD.V,1 66.tif 3,944 × 5,000; 18.81 MB PRIMARY MILL AND CLASSIFIER No. 2 FROM NORTHWEST. MILL DISCHARGED INTO LAUNDER WHICH PIERCED THE SIDE OF THE CLASSIFIER PAN.
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