Opencast Mining - Study Mode
[#151] Mining involves mining and washing together in unconsolidated and semi consolidated rock near surface.
Correct Answer
(A) Placer mining
[#152] Limiting gredient for continuous surface miner is . . . . . . . .
Correct Answer
(B) 7°
[#153] Refraction seismograph operates on the principle of . . . . . . . .
Correct Answer
(A) Sound wave travel subssurface material at different velocity
[#154] Small pillars of rocks excavated are left for measurement called . . . . . . . .
Correct Answer
(B) Witness pillar
[#155] The output capacity of a drag line with 4.5 to 7.5 cu.m is million cu.m per year
Correct Answer
(A) 0.25 to 0.75