These are namely a simple crushing, grinding, concentrating, and flotation circuit without frill or fancy theories, but with a constant supply of ore through the mill at a nominal profit per ton, operating continually 24 hours per day.
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In the primary stage, the devices used are mostly jaw crushers with openings as wide as two metres. These crush the ore to less than 150 millimetres, which is a suitable size to serve as feed for the secondary crushing stage. In this stage, the ore is crushed
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High level, pre tax, net present value (NPV) determinations were calculated for Options 1 to 3 relative to the base case, Option 4 by applying a 10 percent discount rate over 12 years of operation. Option 4 was used as the base case since it returned the lowest capital and operating cost, and therefore NPV.
LOW COST OPERATION IN THE UNITED STATES. The 700 ton mill operated by the Standard Cyanide Co. in Nevada between the years 1939 and 1942, when it was closed as a result of government order during the Second World War, succeeded in making a profit
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Zinc ores contain 5 15% zinc. Zinc concentrate processing operation typically involves the mining of ore from either open pit or underground mines; the crushing and grinding of ore; the separation of valuable minerals from matrix rock through various concentration steps.
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