Copper ore of average grade 0.65% is mined, milled, smelted and then refined. The following information is available:
Mill recovery rate : 85%
Average grade in mill concentrate : 20%
Loss in smelting process : 5 kg/tonne of concentrate
Loss in refining process : 2 kg/tonne of blister copper
The amount of refined copper obtained per tonne of ore in kg is
5.10
5.37
5.52
6.50
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