In an open pit mine, the mineral inventory, prices, costs and capacities are given.
| 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 mining capacity being the only constraint, Lanes’ 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)
Min: 9.5 Max: 10
Answer: 9.75
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