Mining Engineering
GATE MN topic:mine-planing PYQs
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Question 59
Open questionMNNAT2 marksNeeds review
Data from a borehole log with collar elevation at 590 mRL are given below. Composite grade is calculated using cores of 5 m above and below the reference bench at 580 mRL. The composite grade, in %, is ___ (rounded off to 1 decimal place)
Sequence of cores (top to bottom) | Core length (m) | Grade (%) |
|---|---|---|
1 | 3.0 | 40 |
2 | 3.0 | 42 |
3 | 2.0 | 41 |
4 | 3.0 | 43 |
5 | 2.0 | 42 |
6 | 3.0 | 41 |
7 | 3.0 | 44 |
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