你即將離開本站

並前往http://www.em.gov.bc.ca/dl/PropertyFile/NMI/082F14_Zn2.pdf

1 R~F - Energy, Mines and Petroleum Resources

Drifting and overhand stoping was done on the "A" vein, and on the "D" vein a raise connection was made to the bottom of the old shaft.

確定！ 回上一頁

查詢 「overhand stoping」的人也找了：

  1. breast stoping
    2.
  2. stoping mining
    3.
  3. shrinkage stoping
    4.
  4. square-set stoping
    5.
  5. underground stope
    6.
  6. open stope mining
    7.
  7. underhand stoping
    8.
  8. overhand cut and fill mining method
    9.