Introduction To Mining Engineering - Study Mode

[#181] Advance supporting of 30 m at both the gate roads is required due to
Correct Answer

(A) front abutment pressure

[#182] A 15 m 3 dragline is deployed in an O.B. bench of an O.C. mine. It works for 40 days at the rate of 6 hrs per shift and 3 shifts a day. The cycle time, bucket fill factor, and operating efficiency of the dragline are respectively 50 s, 0.8, and 75%. The total volume of O.B. in m 3 handled by the dragline is
Correct Answer

(D) 466560

[#183] Mine life time should be calculated based on
Correct Answer

(B) commercial reserve

[#184] No mode or type of Capping shall be used which fails to withstand a load of atleast "N" times the maximum static load. N is given by
Correct Answer

(D) 10

[#185] Over 80% of underground coal production in India comes from
Correct Answer

(C) bord & pillar method