A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
What roof conditions permit pillar recovery
Pillar recovery is governed by nature of roof, rate and continuity of mining, and costs; roofs that are extremely soft do not favor pillar recovery -- roof behavior must be judged by trial and error.
What roof conditions permit pillar recovery
Pillar recovery is governed by nature of roof, rate and continuity of mining, and costs; roofs that are extremely soft do not favor pillar recovery -- roof behavior must be judged by trial and error.
What roof conditions permit pillar recovery
Min Congress J
Greenwald, H.P. (author)
1947
2 pages
Article (Journal)
English
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