copper ore grade from nchelenge

Extraction of Copper from Malanjkhand Low-Grade Ore by Bacillus ...

Jan 26, 2011 ... The low-grade copper ore contains 0.27% Cu, in which the major copper-bearing mineral is chalcopyrite associated with other minerals...

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Innovations: Introduction to Copper: Mining & Extraction

The known reserves of higher-grade ore in the world amount to nearly 1 billion tons of copper. At the present rate of mine production, which is about 13.9 million...

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