An Introduction to the Study of Ore Deposits

acid alluvial aluminium Arizona auriferous bathyliths beds bodies bornite brecciated Bushveld Complex calcite carbonate Carboniferous limestone cassiterite cavities cent chalcocite chalcopyrite chamosite chemical chloride chromite circulation Colorado concentration consist copper deposits Cornwall country-rock covellite derived differentiation district dolomite Econ erosion feet felspar filling fissures formation formed fractures galena garnet Geol gold granite gravels greisen hæmatite deposits hydrated igneous rocks ilmenite Inst intrusions iron ore deposits iron oxides iron pyrites iron-ore ironstone laterite lavas leaching lead-zinc limonite lodes magma magnetite Malaya manganese metals metasomatic metasomatic replace Mexico minerals mining nickel norite occur ooliths ore-shoots origin oxidized zone pentlandite pipes placers platinum pneumatolytic porphyry precipitation PRETORIA SERIES primary pyrrhotite quartz saddle-reefs sandstones Saxony secondary enrichment sediments shales showing siderite silicates silver slates soluble solutions sulphate sulphide sulphur surface Surv temperature Tetrahedrite tin deposits tourmaline Transvaal veins volcanic W. H. Emmons Wheal zinc zone of secondary zone of weathering