A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Support of ground, iron-ore mines, Lake Superior district
Report describes practices at 13 of 44 active underground mines in Lake Superior district; natural support depends on strength of ore and wall rock and their ability to support themselves over certain spans; pillars are principal means of natural support; artificial support may be provided by filling, timber, steel, or concrete.
Support of ground, iron-ore mines, Lake Superior district
Report describes practices at 13 of 44 active underground mines in Lake Superior district; natural support depends on strength of ore and wall rock and their ability to support themselves over certain spans; pillars are principal means of natural support; artificial support may be provided by filling, timber, steel, or concrete.
Support of ground, iron-ore mines, Lake Superior district
U S Bur Mines -- Information Cir
Petersen, M.S. (author) / Cash, F.E. (author)
1948
29 pages
Bibliography, Supp plates
Report
English
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