Mining Engineering > GATE 2025 > Resource Estimation
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 |
Correct : 42.3
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