With the development and application of deep hole drilling rigs , the effective depth of the blasthole can reach 40~60m. Under this circumstance, the section rock drilling can be changed to stage rock drilling to form the stage rock drilling stage mining method. The depth of the vertical blasthole is the mining height of the mine, and the deep hole rock drilling work is concentrated on one level. Compared with the section rock drilling stage mining method, not only the mining workload is greatly reduced, but also the drilling frame setting and displacement times are reduced, and the production efficiency is greatly improved.

The mining method in the rock drilling stage, which is widely used at home and abroad, is the Vertical Crater Retreat Method (VCR method). The essence of the method is to use the underground down-the-hole drilling rig to drill the vertical or inclined deep hole to the bottom layer in the horizontal layer of rock drilling at the top of the mine, according to the optimal hole network rig, using high power, high density and high detonation speed. Low-sensitivity explosives ("three high and one low explosives") in a spheroidal package (the ratio of diameter to length is not more than 1:6) from bottom to top, stratified blasting in the lower bottom space, and high Efficient mining equipment (scraper) for ore shipment work.

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