11. The stripping ratio for shavel dumper combination is . . . . . . . .
12. In manual quarry the bench, height usually in hard rock.
13. Shear needs electricity of
14. Linear failure or plane failure is due to
15. The mining lease is granted by . . . . . . . .
16. Gradients of roads in quarries for tyred vehicular traffic should not exceed . . . . . . . .
17. The limiting gradient of surface miner.
18. The shovel used stripping top soil and making shallow cuts and benches upto depth of 3 - 6m is . . . . . . . .
19. In which mining early extraction is possible with quick return.
20. Where the over burden consists of soft rock which can be conveniently removed by
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