Hydraulic breaker to reduce the size of the stones with large overdoses. To perform a Secondary blasting reduces penetration and increase working hours do not need to escape the bomb sub.
Hydraulic breaker to reduce the size of the stones that are more abundant. Do not make the Secondary blasting to reduce drilling subsidiary. And increased working time must not escape its explosion.
Hydraulic breaker used to reduce the size of stone size, overdose, does not have to be made to reduce the time Secondary blasting drilling digest. And increase the work time to escape the bomb digest.