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United States mineral position relative selfsufficiency of principal
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accidents acid alteration alunite anhydrite anticline areas argillic average Basin Bureau of Mines butane Butte carbon catalyst chemical clay coal mines coal-mining Colorado Colorado School Company copper cost cracking deposits depth distillation district drilling dust economic effect engineering engineering geologist epithermal equipment estimates explosion factors fatalities feet field FIGURE fissures flow formation fuel fumaroles furnace gases Geological Survey geologist geology geophysical ground water ground-water heat highway geology holes hydrothermal increased industry kaolinite lignite limestone material metal methods mineral montmorillonite oil shale operation orthoclase percent petroleum plant possible pressure problems production quartz quartz monzonite relatively rock samples School of Mines sediments sericite shaft shale silica solfataric solutions space velocity stream structure studies sulphides surface temperature tion tons tubes U. S. Geol U. S. patent underground United valve vapor vein ventilation volcanic wall zeolites zone