Mining or in situ disintegration of hard material – Processes – Explosive
Patent
1999-06-11
2000-11-14
Bagnell, David
Mining or in situ disintegration of hard material
Processes
Explosive
299 16, 299 29, 299 373, 299 69, E21C 3712
Patent
active
06145933&
ABSTRACT:
The present invention is directed to a method for breaking rock and other hard materials using small-charged blasting techniques followed by a mechanical impact breaker. In small-charge blasting techniques, a gas is released into the bottom of a sealed hole located at a free surface of the hard material. The gas pressure rises rapidly in the hole until the gas pressure causes the hard material to fracture. In one embodiment, the a deeper hole is drilled and/or a small amount of blasting agent is used to cause the formation of a network of subsurface fractures while either not removing any of the rock or removing the rock with very low energy flyrock. In another embodiment, only the central portion of the face is broken and/or removed by blasting. The impact breaker is then used to complete fracturing and removal of the material.
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Micke Brian P.
Watson John David
Bagnell David
Kreck John
Rocktek Limited
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