Economic Comparison
Manual Cable Bolting/Mechanized Cable Bolting
Data from a lead/zinc mine, using the cut and fill method. Cable bolting of an area in the ore body, 3 slices containing 62.000 tonne of ore (average ore value SEK 373/tonne, total SEK 23.126.000).
75 holes (51 mm 2" dia) 14 m (46 ft) long = 1.050 m (3,444 ft).
Performance:
• Manually 387.5 hours = 48.4 shifts = 16.1 days (3 shift/day)
• Mechanized 61.8 hours = 7.7 shifts = 2.6 days (3 shift/day)
| Reinforcements costs | Manual | Mechanized |
| Personnel
costs (SEK 135/h, USD 17/h) |
52.313 (USD 6.458) | 8.343 (USD 1.030) |
| Drill steel | 16.413 (USD 2.026) | 16.413 (USD 2.026) |
| Grout etc. | 3.500 (USD 432) | 3.500 (USD 432) |
| Cable | 7.350 (USD 907) | 7.350 (USD 907) |
| Cable
Bolting equipment (net investment SEK 1.800.000 (USD 222.000) pay off 50.000m, 164.000ft, holes) |
- | 37.800 (USD 4.667) |
| Maintenance costs | - | 3.150 (USD 389) |
| Total | 79.576 (USD 9.824) 75.78/m (USD 30.7/ft) |
76.556 (USD 9.451) 72.90/m (USD 29.5/ft) |
Cost for the mined ore:
• Manually 180 x 18 x 75.78 = 245.592 = 3,96 tonne ore (USD 0,498/tonne)
• Mechanized 180 x 18 x 72.90 = 236.196 = 3,80 tonne ore (USD 0,469/tonne)
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