Study on High-Efficiency and Low-Depletion Upward Horizontal Layered Filling Mining Method for Complex Metal Deposits
In view of the problems of large ore dilution and loss and poor stope stability in the mining of complex metal deposits,the"之"shaped low-depletion mining technology in the vein and the airbag pre-occupancy method were proposed.On this basis,a new method of high-efficiency and low-depletion upward horizontal layered filling mining was proposed.Based on a gold mine in Inner Mongolia,the structural parameters of the layered stope and the overall structure and size of the pre-occupancy airbag were studied by means of field investigation and laboratory test.The results are as follows.Firstly,the RMR value of the rock mass quality index of the test section of the mine is 51-63,and the limit span of the corresponding stratified stope is 5.5-10.5 m.Secondly,the overall structure of the pre-occupancy inflatable airbag was designed and determined.The working pressure of the inflatable airbag is calculated to be 0.2 MPa,and the bearing capacity is 0.5 MPa.The relationship between the blasting compensation space and the rock crushing coefficient is obtained,and the reasonable span of the pre-occupancy inflatable airbag is determined to be 2.5 m.On this basis,the field industrial test was carried out.The industrial test stope is 4 m high,5.5 m wide and 2 m long.The mining results of the test stope show that the two-step stope production capacity of this method can reach 150 t/d,the ore recovery rate reaches 94％,and the ore dilution rate is 4.8％,which realizes the high-efficiency and low-depletion mining of complex metal deposits.
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