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Application of Shallow-hole & Medium-length-hole Shrinkage Stoping Mining Method with Bolting Roof in Iron Mine#br#

XIA Jianbo1,LIN You1,LIN Jifei1,SHEN Xu1,ZHAO Mingliang2   

  1. 1.Faculty of Mining Engineering,Kunming Metallurgy College,Kunming 650033,China;
    2.Yunnan Diqing Nonferrous Metals Co.,Ltd.,ShangriLa,Yunnan 674400,China)
  • Received:2018-10-22 Online:2019-02-28 Published:2019-02-28

Abstract: To solve the problem of roof maintenance in the original mining method in Gaojingcao iron mine,the paper put forward a mining scheme for shallow hole & mediumlengthhole shrinkage stoping method for roof protection with bolts.The orebody is divided into two layers,the upper layer is blasted by shallow hole while the lower layer is blasted by parallel mediumdeephole,andtheupperandlowerlayers are pushed from bottom to top simultaneously.The unstable roof is strengthened by an chorbolts.The mining scheme has been successfully applied to the mines:the miningcutting ratio of 1000 ton swas reduced by2.42m·kt-1,the comprehensive recovery was increased by5.2%,the mining efficiency up by 2.3t·shift-1,the production capacity increased by 120t·d-1,and the direct cost of mining has been reduced by5.6yuan·t-1.The improved scheme has higher practical value and economic benefits.

Key words: steeply inclined, medium thick orebody, mining method, bolting roof, shallow hole & medi
um-length-hole,
shrinkage stoping method

CLC Number: