A Treatise on Metalliferous Minerals and MiningCrosby Lockwood, 1886 - 438 стор. |
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acid alluvial auriferous average beds calcareous Cambrian Cambro-Silurian carbonate Carboniferous limestone cent chloritic clay slate cloth boards coal Coal-measures colour Comstock lode containing copper pyrites Cornwall course cracks Crown 8vo crystals deposits depth described Devonian drift drill dwts earthy Edition Engineering fathoms felspar felspathic filled fissure Flintshire galena geological gneiss gold gossan grains granite greenstone grey hæmatite hornblendic Illustrations inches iron pyrites ironstone lead mines lime Llandeilo lode machine mass matter mercury metallic metalliferous metamorphic rocks miles mineral mineralised mining district Mining Journal mountains North numerous occurs ounces of silver oxide Plates porphyritic portion Practical production proportion pumping quantity quartz range Revised River sandstones shaft shale shown in fig side silica Silurian slaty rocks spar stamps steam stone stopes strata sulphide sulphur surface Timber tons traversed Treatise upper usually Wales yards yield zinc
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