The Deep-level Mines of the Rand and Their Future Development: Considered from the Commercial Point of ViewC. Lockwood and Son, 1902 - 171 páginas |
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36 inches Algoa Bay amortization amount assay inches assay value assume average value banket basis Boksburg calculated capital account charge coal compound interest cost of development cross-cut Crown deep-level companies deep-level mines deep-level properties deep-level shafts depth development redemption Diagram dividends drums Durban dwts dykes East East Rand engine equipment estimated fault figure foot footwall Geldenhuis Deep gold headgear pulley hoisting home cost Illustrations incline shaft instance intervals Johannesburg Krugersdorp Langlaagte Deep machinery Main Reef Leader Metallurgy method miles milling MINERALS Modderfontein native labour number of stamps obtained operations outcrop mines payable plant possible present value producing stage profit proportion pump pyritic quartzite railage railway Rand Randfontein reduced result rock Roodepoort rope sampled Shaft sinking shillings shoots sorting South Reef stoping width sunk thickness ton milled tonnage tons per claim total cost unpayable vertical shaft West whilst winzes Witwatersrand writer yield