Economic Geology and the Bulletin of the Society of Economic Geologists, Volume 22
Economic Geology Publishing Company, 1927 - Geology, Economic
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abundant alteration amount appear associated batholith beds belt carbonate carry cent chalcopyrite clay Cloth coal Coast concentration considered containing copper crystals deposits depth described diatom diorite discussion district earth East ECONOMIC GEOLOGY evidence experiments fact feet field Figs formation formed Geol geologists Geology give given gold granite igneous important increase indicated intrusives iron kinds known later less lower magma magnetite masses material metals microscope miles minerals mining natural nickel North noted occur organic origin oxidized pentlandite petroleum platinum platinum metals position possible present probably production pyrite pyrrhotite quartz Range recently region relation replacement rocks schist sediments seems sericite serpentine shale silicates silver similar solutions South specimens structure substances suggested sulphides sulphur surface Survey talc temperature theory tion University veins zone