Mining Engineering > GATE 2025 > Cutoff Grade
The relevant information on metal extraction from a copper mine are given below:
Selling price of copper (Rs./kg)=900
Mining cost (Rs./tonne of ore)=500
Processing cost (Rs./tonne of ore)=2000
Overall recovery of copper metal (%)=70
Ignoring all other costs, the breakeven cutoff grade of copper, in %, is ______ (rounded off to 2 decimal places)
Selling price of copper (Rs./kg)=900
Mining cost (Rs./tonne of ore)=500
Processing cost (Rs./tonne of ore)=2000
Overall recovery of copper metal (%)=70
Ignoring all other costs, the breakeven cutoff grade of copper, in %, is ______ (rounded off to 2 decimal places)
Correct : 0.39
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