A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Mining methods and costs, black rock tungsten mine, Wah Chang mining corp, Mono County, Calif
Mine is developed in five levels interconnected by raises, manways, and stopes; mineralization of tactite was probably determined by minor cross fractures; no rigid systematic mining is used; mucking is done by air operated shovels; material from stopes is directly scraped into cars.
Mining methods and costs, black rock tungsten mine, Wah Chang mining corp, Mono County, Calif
Mine is developed in five levels interconnected by raises, manways, and stopes; mineralization of tactite was probably determined by minor cross fractures; no rigid systematic mining is used; mucking is done by air operated shovels; material from stopes is directly scraped into cars.
Mining methods and costs, black rock tungsten mine, Wah Chang mining corp, Mono County, Calif
US Bur Mines -- Information Cir
Johnson, A.C. (author) / Fillip, N.M. (author)
1960
19 pages
Report
English
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