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Principles of Mining: Valuation, Organization and Administration: Copper ...
No preview available - 2017
Principles of Mining: Valuation, Organization and Administration
No preview available - 2015
advantage alternative amortization amount annual application arise assay average banket broken Broken Hill calculations capital outlay character combined shaft comparative compressed air copper cost crosscuts cubic foot demand dependent determination discussion distance drill duction economic electrical equipment exhausted expenditure extension in depth factors feet filled with waste fixed charges foot gold haulage holes horizon inclined deposits increased installation investment labor less levels limitations load Longitudinal section loss machine-drilling machines mechanical efficiency ment metal contents metal mines method miners operating ore-bodies ore-breaking output overhand stopes oxidized pillars possible price of metal production profit in sight prospecting pumps result rill rill-stoping risk roadway rock samples saving shoveling skip specific gravity square-sets steam stulls sublevels sulphides surface timber tion tonnage tons transmission transmission medium tunnel underground usually valuation vertical shaft volume walls warrant West Australia width winding winzes zinc zone