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square-set system

A method of mine timbering in which heavy timbers are framed together in rectangular sets, 6 to 7 ft (1.83 to 2.13 m) high, and 4 to 6 ft (1.22 to 1.83 m) square, so as to fill in as the orebody is removed by overhand stoping.

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  • ed.young
  • (Milwaukee, United States)

  •  (V.I.P) 21084 分数
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