Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Mining methods at the campbell mine of the calumet and Arizona mining Co., Warren, Ariz.
Inclined cut-and-fill and semi-shrinkage; average yearly production 496,612 tons of 5 per cent copper ore; history; geology; characteristics of ores and rocks; prospecting and exploration; sampling and estimation of ore; development and mining; underground haulage and skip hoisting; bonus system; ventilation; fire hazards and safety; cost data include only direct charges relating to methods discussed.
Mining methods at the campbell mine of the calumet and Arizona mining Co., Warren, Ariz.
Inclined cut-and-fill and semi-shrinkage; average yearly production 496,612 tons of 5 per cent copper ore; history; geology; characteristics of ores and rocks; prospecting and exploration; sampling and estimation of ore; development and mining; underground haulage and skip hoisting; bonus system; ventilation; fire hazards and safety; cost data include only direct charges relating to methods discussed.
Mining methods at the campbell mine of the calumet and Arizona mining Co., Warren, Ariz.
U. S. Bur. Mines -- Information Cir
Lavender, H.M. (Autor:in)
1930
18 pages
13 Figs.
Report
Englisch
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