A Text-book of Ore and Stone MiningC. Griffin, limited, 1894 - 744 sider |
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Vanlige uttrykk og setninger
adit anhydrite blasting blasting gelatine bore-hole boring Boryslaw bottom bucket carbonic carbonic acid carried cast-iron cent chamber clay clinostats coal compressed air Comstock lode consists copper Cornwall cubic cylinder deposit depth district drill driven employed engine excavation explosive feet fire frame galena gold gravel groove ground hole horizontal hydraulic mining inches in diameter inclined Inst iron iron pyrites ironstone limestone lode lower machine main rod Mechernich method metres mineral mines nitro-glycerine ordinary ozokerite particles passes pieces pillars pipe piston placed plate pressure pulley pumping pyrites quarries quartz rails ring rock roof rope rubbish sandstone schist screw shaft shale side sinking slate sometimes steam steel stone stopes strata strike surface thick timber tool tube tunnel underground valve vein ventilation vertical waggon wedge wheels whilst wire wooden yards
Populære avsnitt
Side 9 - We are of opinion, therefore, that the term as used in the acts of Congress is applicable to any zone or belt of mineralized rock lying within boundaries clearly separating it from the neighboring rock.