How many kilograms of chalcopyrite must be mined to obtain 425g of pure Cu?

The chemical formula for Chalcopyrite is CuFeS₂. This compound corresponds to a molecular mass of 183.54.

The distribution of mass for this compound is

Iron      Fe  55.845 (1) 30.430%

Copper Cu  63.546 (1) 34.626%

Sulfur S      32.065 (2) 34.944%

Cu – copper represents 34.626% of the total mass of this compound

To mine 425g of pure copper, requires a quantity of Chalcopyrite equal to

$$\frac{425g}{0.34626} =1227.4g }{}$$

 

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