A Treatise on Metalliferous Minerals and MiningC. Lockwood and Company, 1881 - 432 стор. |
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acid adit alluvial auriferous drift average beds calcareous Cambrian Cambro-Silurian Carboniferous limestone cavities cent chloritic cloth boards Coal Coal-measures colour Comstock lode containing copper pyrites Cornwall cost course cracks crystals deposits depth Devonian dressing drill dwts earthy Edition Engineering fathoms felspar felspathic filled fissure flat Flintshire galena geological gneiss gold gossan grains granite greenstone grey ground hæmatite hornblendic Illustrated inches iron pyrites ironstone lead mines Llandeilo lode machine mass matter mercury metallic metalliferous metamorphic rocks miles mineral mineralised Mining Journal mountains name given North numerous occurs ounces of silver oxide Plates porphyritic portion production profit proportion protoxide pump quantity quartz range River sandstones shaft shale shown in fig side silica slaty rocks sluice spar stamps stone stopes strata stream sulphide sulphur surface timber tons traversed Treatise trough upper usually veins Wales washing yards yield zinc
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