21. The most common system of stope extraction is to maintain as . . . . . . . .
22. In shrinkage stoping the inclination of stope wall should be . . . . . . . .
23. Extraction of small sized, irregularly unsystamatic underground working called
24. For a successful VCR stoping, which of the following is appropriate.
25. Capacity of slusher is . . . . . . . . tph.
26. The raise boring consists essentially of drilling a pilot hole of diameter . . . . . . . .
27. The main advantage of drop raising is that number of workers in the lower level are . . . . . . . . except the operator of LHD.
28. A system of vertical or nearly vertical openings for transfering ore from a stope to a single delivery point.
29. In this method needs heavy supports comparative than other methods and also supporting costly.
30. The method used for mining narrow veins or pay streaks, where ore occurs as a distinct band, can be separated easily from wall rocks, mining known as . . . . . . . .
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