A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Pillar extraction with roof bolts
Greater recovery and fewer accidents from use of roof bolts in retreat work at five West Virginia mines; results of investigation made by U S Bureau of Mines; practice at mine No 1 described where pillars are extracted on seven sections and roof bolts used on four of these; comparison of results of mining with conventional timbering to mining with roof bolting; observations on roof falls; economic effect of new method.
Pillar extraction with roof bolts
Greater recovery and fewer accidents from use of roof bolts in retreat work at five West Virginia mines; results of investigation made by U S Bureau of Mines; practice at mine No 1 described where pillars are extracted on seven sections and roof bolts used on four of these; comparison of results of mining with conventional timbering to mining with roof bolting; observations on roof falls; economic effect of new method.
Pillar extraction with roof bolts
Min Congress J
Gilley, J.L. (author) / Thomas, E. (author)
1951
Diagrams
Article (Journal)
English
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