发明名称 Method and apparatus for developing shafts using small diameter shafts
摘要 A mining method and apparatus includes drilling two relatively small diameter shafts in proximity to each other, and operating a single hoisting system between the two shafts. The hoisting system includes a hoist that simultaneously moves first and second conveyances in opposite directions respectively in the first and second shafts.
申请公布号 US5513903(A) 申请公布日期 1996.05.07
申请号 US19940300215 申请日期 1994.09.06
申请人 DEEP SHAFT TECHNOLOGY, INC. 发明人 MRAZ, DENNIS
分类号 E21C41/16;E21D1/03;E21D7/02;(IPC1-7):E21D7/02 主分类号 E21C41/16
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