Introduction To Mining Engineering - Study Mode
[#166] A surface mine blast design has 9 holes in a row, each of 8 m length and 200 mm diameter. The spacing and burden are 6 m and 5 m respectively. The length of subgrade drilling is 1 m and the density of in-situ rock is 2.43 t/m 3 . Assuming no back break, the output per blast in t is
Correct Answer
(A) 4593
[#167] Wagon drill working at minimum compressed air pressure of
Correct Answer
(A) 6 kg/cm 2
[#168] It is a solid block of coal surrounded on all its side by galleries. Identify it
Correct Answer
(C) coal pillar
[#169] Crown Pillar is
Correct Answer
(A) at the top of the stope
[#170] Apart from mining of coal, the longwall mining method has been practiced for mining the deposits of
Correct Answer
(D) pyrite and phosphate