Research on the Bunch-holes Crater Retreat Mining Method
In response to the problem of small layered thickness and low production capacity of the subleve caving mining with spherical charge,based on the theory of bunch-holes blasting,the bunch-holes crater retreat mining method(BCR)is developed.Bunch-holes blasting has the enhancing rock breaking effect.When using equivalent spherical charge(ESC)of a bunch-holes with 4-5 holes,the blasting layering height is 2-3 times that of a single hole.The BCR mining method uses equivalent spherical charge(ESC)crater for blasting with deep bunch-holes,and the spacing between bunch-holes is 7-8 m,and the ordinary industrial explosives are used.Each layered blasting has a height of 5-8 m.The dilution rate is 8％,the loss rate is 10％,the large block rate＜5％and the production capacity is 1 800-2 400 t/d.Compared with the single hole spherical charge blasting VCR method,the large block rate is reduced by 10％-20％,and the stope production capacity is increased by more than twice.BCR mining method is a large-scale and efficient mining method suitable for thick and large ore bodies,medium thick and steeply inclined ore bodies.
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