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B MINERALS EXPLORATION BEFORE 1872
CHANGES IN MINERAL EXPLORATION TO 1947
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advanced processing amalgamation amount anomalies Arizona Copper beneficiation California changes chemical claims Comstock Comstock Lode concentration copper deposits costs crushing deposit evaluation discovery district drill hole dump early economic electrical equipment excavation favorable feet flotation Frasch process froth flotation furnace geochemical geologic geologists geophysical methods gold gravel gravity Gypsum important industrial minerals involved iron land leaching lead limestone line mile lode low-grade magnetic mapping material mercury metallurgical mill mineral commodities mineral deposits mineral production minerals exploration Mining Company mining methods molybdenum Nevada open pit mining orebody outcrops overburden oxide percent phase phosphate placer placer deposits placer mining plant porphyry copper potash potential pre-production Prior prospecting prospectors regional reconnaissance relatively rock salt sampling shaft silver smelting specific stoping sulfide sulfur surface mining target area examination techniques tons types underground mining United uranium usually Utah valuable mineral veins Western zinc