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Studies of Sedimentary Basins
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accidents acid alkaline alteration alunite anhydrite anticline argillic average Basin blasting Bureau of Mines burkeite Butte carbon chemical chlorite clay coal mines coal-mining Colorado Colorado School Company cost County cubic Denver deposits depth district drill dust effect engineer engineering geologist epithermal equipment explosives fatalities feet feldspars field figure fissures formation fumaroles gases geologist geology geophysical ground water ground-water haulage heat highway holes hydrothermal increased industry kaolinite lignite limestone loading machines material mechanical metal methods minerals montmorillonite occur Oil and Gas oil shale operation orthoclase percent permeability Petroleum places plant present pressure problems production pyrite quarries quartz quartz monzonite relatively reservoir rock safety samples School of Mines sediments sericite shaft shale silica solfataric solutions structure studies sulphides surface Survey temperature tests tion tons U. S. Geol underground United States Bureau vein ventilation volcanic walls workers zeolites zone