The process of ejection of stemming material from a
blast hole is strongly dependent on the length of stemming material.
High-pressure gas is ejected from the gas ports at specific directions and angles in the gas release tube and acts on the coal body around the
blast hole. The direction and diameter of the gas ports are designed to control the gas flow direction and concentrate the energy according to common engineering practices.
Due to the fact that the
blast holes studied in this paper are small in size and large in amount, it is inconvenient to build the
blast hole model through the method of explosion load exertion in three-dimensional model.
The deals will allow the buyer to tap the rotary
blast hole drilling industry and enter target markets in eastern Australia and southern Africa.
When Guido acquired this proprietary technology, it was originally designed for drilling
blast holes in open pit mining.
The Swedish industrial productivity solutions provider Atlas Copco said on Thursday (16 March) that it has won an order for 11
blast hole drill rigs from Brazilian mining company Companhia Vale do Rio Doce (CVRD).
ft of manufacturing space, Bucyrus manufactures walking draglines, electric mining shovels and/or rotary
blast hole drills.
The man said he later dug up a shell measuring 1 cm in diameter and 6 cm long from the
blast hole. The shell was buried about 25 cm deep, he said.
According to Mitsui Mining officials, the brick wall collapsed while the workers were digging a
blast hole for dynamite.
As the man-lift operator progressed across the face loading the
blast holes, the wedged shock-tube stretched and broke (snapped) causing a pre-detonation of a
blast hole.