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More Mining Engineering Questions
If the $$\frac{{CO}}{{{O_2}}}$$ deficiency ratio is 3% or more it indicates . . . . . . .
The number of blows produced by down the hole hammers bits.
The transit theodolite fitted with stadia diaphragm and an annalatic lens called
The colour of Ammonium Nitrate.
The ropes which under go frequent movement of coiling they are called . . . . . . . .