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.