Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Method of timbering No. 3 seam mined at Nordegg, Alberta; seam pitches 12° and varies in height from 5 to over 30 ft; mine is worked by room and pillar method, using double entry system; use of ordinary bridge stick and "square set" methods of timbering.
Method of timbering No. 3 seam mined at Nordegg, Alberta; seam pitches 12° and varies in height from 5 to over 30 ft; mine is worked by room and pillar method, using double entry system; use of ordinary bridge stick and "square set" methods of timbering.
Timbering in thick seams
Can Min Met Bul
Amico, Z.D. (Autor:in)
1954
4 pages
Diagrams
Aufsatz (Zeitschrift)
Englisch
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