The Deep-level Mines of the Rand and Their Future Development: Considered from the Commercial Point of ViewC. Lockwood and Son, 1902 - 171 páginas |
Otras ediciones - Ver todas
Términos y frases comunes
36 inches 40 per cent 48 inches 60 inches Algoa Bay amortization amount assay inches assay recovered assay value assume average value average width banket basis Boksburg calculated capital account coal compound interest Cost per milled cross-cut Crown deep-level companies deep-level mines deep-level shafts depth development redemption dividends drill drums Durban dwts dykes Dynamite East East Rand engine equipment estimated expenditure extraction fault feet figure footwall freight gold hoisting home cost Illustrations instance intervals Johannesburg machinery Main Reef Leader method mile Modderfontein month native labour number of stamps obtained operations payable plant possible practice producing stage profit proportion pulleys pump pyritic quartzite railage railway Rand Randfontein recovery value reduced result rock Roodepoort rope sampled Shaft sinking shillings shoots shown Sorting 40 South Reef stoping width taken thickness ton milled tonnage total cost total number Ultimate recovery unpayable vertical shaft winzes Witwatersrand writer yield