A Textbook on Mining Engineering, Volumen5 |
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Términos y frases comunes
acid added amount angles appearance arsenic assay bead becomes beds bismuth blowpipe blue borax brown button called carbonate carried changes characteristic charcoal charge chemical chloride cleavage closed coal coat cold color colorless combine Composition compounds containing cooling copper crucible crystal cupel deposits determined dissolve distinguished elements employed faces feet filter flame formation frequently fuses given gives glass gold green hardness heat illustrated inches iron known lead less luster mass material means metallic method mineral mining nature necessary obtained occurs operation oxide pass pipe plane portion practically precipitate present pure reactions reduced removed rocks salt sample shown shows side silica silver sluice soda solution sometimes stones streak substance sulphide sulphur surface TABLE tion treated tube usually varieties various veins volatile washed weight yellow zinc
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Página 59 - At proper intervals waste-gates should be arranged so as to discharge the water when necessary, without risk of damage to the ditch. In regions of heavy snow, these wasteways should be provided at intervals not greater than onehalf a mile.