GATE 2023 MN – Question 28

Mineral Economics, Mine Planning, Systems Engineering · Mine Planning · 1 mark · Numerical answer

Copper ore grade is 0.9%, overall processing/smelting/refining recovery is 85%, and refined metal sells at ₹640/kg. Find sales revenue from one tonne of ore in rupees, to one decimal.

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Correct answer: 4895 to 4897

Explanation

One tonne contains 1000×0.009 = 9 kg copper. Overall recovered metal is 9×0.85 = 7.65 kg. Revenue is 7.65×640 = ₹4896.0. The 0.9% grade must first be converted to the fraction 0.009; no mining cost is requested.

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