Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
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. (Autor:in)
1947
2 pages
Aufsatz (Zeitschrift)
Englisch
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