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More Mining Engineering Questions
Weight of model 625 Auger drill machine.
It is one of the oldest drilling technologies where hole is drilled by striking a number of blows at short intervals on the rock by a chisel type tool and between the blows the tool is rotated. The drilling is called
In a room-and-pillar stope, bench blasting is conducted using ANFO having density of 800 kg/m 3 . The specific gravity of rock is 2.5, hole diameter is 100 mm and spacing to burden ratio is 1.3. The charge length of each blast hole is 80% of the hole length. For a desired powder factor of 0.48 kg/tonne, the spacing and burden of the blast pattern in m respectively are
From a hard rock open pit mine, the following data available Burden : 3 m Spacing : 4 m Bench height : 12 m Sub-drilling : 1 m Collar stemming : 4 m Diameter of hole : 150 mm Density of rock : 2500 kg/m 3 Density of explosive : 800 kg/m 3 The powder factor in kg/t is
The width of manhole not more than . . . . . . . . m.