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PDF Chapter 7 Energy Use in the Copper Industry1996 11 20 duction of cathode copper Assuming an ore grade of 0.55 percent and a recovery rate of87.5 6.4 percent copper in the concentrate concentrat ing 1 ton of copper ore requires over 200 billion Btu or approximately 42 million Btu/ton of cath ode copper.10 Grinding accountsfor roughly 6 0 percent of the total energy consumed in proc Extraction Of Copper2021 11 10 Copper Mining The commonest ore used in the extraction of copper is Chalcopyrite CuFeS 2 also known as Copper Pyrites and other such sulphides The percentage of copper in the actual ore is too low for direct extraction of copper to be viable The concentration of ore is required and it is done by the Froth Flotation method Concentration of