GATE MN · 2024 · MN
Question 58: Mineral Economics
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Question 58
MNNAT2 marksNeeds review
In an open pit mine, the mineral inventory, prices, costs and capacities are given.
Mineral inventory
Grade interval | Tonnage (in million tonne) |
|---|---|
0 < Cu% ≤ 0.3 | 0 |
0.3 < Cu% ≤ 0.4 | 5 |
0.4 < Cu% ≤ 0.5 | 5 |
0.5 < Cu% ≤ 0.6 | 5 |
0.6 < Cu% ≤ 0.7 | 5 |
0.7 < Cu% ≤ 0.8 | 5 |
0.8 < Cu% | 0 |
Concentrating cost : INR 3,200/tonne of ore milled
Smelting & refinery cost : INR 10,000/tonne of copper metal
Selling price : INR 6,50,000/tonne of copper metal
Overall recovery : 100%
Maximum production capacity : 5 million tonne/annum
The mine is operating at 5 million tonne in a year. Considering mine capacity being the only constraint, Lane’s algorithm (based on profit maximization) is used for determining mill cut-off grade. The total amount of copper produced in million tonne, in the life of the pit, is _____. (round off up to 2 decimals)
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2024MN
GATE MN 2024 · Paper 1
Mining Engineering · Original paper archive
- Section
- Mining Engineering
- Question type
- Numerical answer (NAT)
- Marks
- 2 marks
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