21. In this method the blast holes drilled in horizontal direction.
22. Which metal is currently mined from ocean floor.
23. MMR can be implimented in the oil mines.
24. Arrange the decreasing order in respect of degree of filling.
25. The method of raising with the help of Alimak raise climber was introduced in . . . . . . . . year.
26. Two or three compartmental raising is adopted for . . . . . . . . raises.
27. What materials are mined by using placer mining.
28. The primary purpose of cut holes for blasting in an underground drivage is to
29. Transportation of sand in a pipe line flow is . . . . . . . .
30. The commonly used method for sample-reduction to suitable size . . . . . . . .
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