A Treatise on Metalliferous Minerals and Mining

acid 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 cost course cracks CROSBY LOCKWOOD deposits depth described Devonian drift drill 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 numerous occurs ounces of silver oxide Plates porphyritic portion Practical productive proportion protoxide pump quantity quartz quartz veins range river sandstones shaft shale shown in fig side silica Silurian slaty rocks spar stamps stone stopes strata stream sulphide sulphur surface Timber tons traversed Treatise upper usually washed Woodcuts yards yield zinc