GATE MN · 2021 · MN
Question 53: Mine Planning
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Question 53
MNNAT2 marksNeeds review
The grade-tonnage distribution for the ultimate pit of a mine is given below.
Cu grade (%) | Cumulative million tonnes below the grade |
|---|---|
0.1 | 0 |
0.4 | 15.0 |
0.5 | 17.0 |
0.6 | 18.0 |
0.7 | 19.0 |
0.9 and above | 23.0 |
The mill cut-off grade is 0.5 % Cu. The annual mining capacity (ore + waste) is 4.5 million tonne and milling capacity is 1.0 million tonne. Excavation is planned in such a way that either of the mine or the mill runs at full capacity throughout. The planned life of the mine, in years, is ______. [round off to one decimal place]
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2021MN
GATE MN 2021 · Paper 1
Mining Engineering · Original paper archive
- Section
- Mining Engineering
- Question type
- Numerical answer (NAT)
- Marks
- 2 marks
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