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Photomicrograph of fresh and metamorphosed limestone, fresh blue limestone, metamorphosed limestone, white marble, no. 7 tunnel Highland Boy mine, adjacent to intrusive, showing rock altered almost entirely to coarse granular calcite. Salt Lake County, Utah. 1900, plate 29-B in U.S. Geological Survey. Professional paper 38. 1905.
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Sulphide enrichment. A central band of cupriferous pyrite (P) containg a trace of tellurium and low values in copper, gold, and silver, is inclosed by bands of chalcocite (C) and tenorite, forming the outer portion of the vein containing considerable tellurium, and high values in copper, gold, and silver. Specimen is from Commercial mine. Natural size. Speciment 220. Salt Lake county, Utah, 1900, in false color as plate 38c in U.S. Geological Survey. Professional paper 38. 1905.
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Photomicrographs of chalcopyrite associated with contact metamorphic minerals. Specularite replacing calcite, from wall of east-west fissure, west end no. 6 level, Highland Boy mine. The black areas are foils of specularite, which replace calcite. The hand specimen from which this thin section was made shows chalcopyrite intergrown with specularite and replacing marble. Salt Lake County, Utah. 1900, plate 37-B in U.S. Geological Survey. Professional paper 38. 1905.
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Later stage in replacement of limestone by copper ore, sulphide copper ore composed of chalcocite, chalcopyrite, and pyrite replacing marble along strike fissures, Highland Boy mine, no. Salt Lake County, Utah. 1900.
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Photomicrograph of fresh and decomposed mineralized monzonite, typical monzonite of Bingham, from Tribune tunnel, Telegraph mine. Fine grained granular to subporphyritic structure. Augite (lower right), biotite (top center), and orthoclase form chief constituents. The enclosing areas are almost entirely feldspathic, including both orthoclase and plagioclase, a little garnet. Augite is uralitized. The small black areas are nearly all magnetite, but a few are grains of pyrite. Salt Lake County, Utah. 1900, with graphics added, plate 26-A, in U.S. Geological Survey. Professional paper 38. 1905.
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Photomicrographs showing replacement of metamorphosed limestone by chalcopyrite and pyrite. Salt Lake County, Utah. 1900.
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Photomicrographs of chalcopyrite associated with contact metamorphic minerals. Chalcopyrite with zinc blende and garnet in calcite, from metamorphosed limestone 60 feet from monzonitic intrusive, no. 7 level, Highland Boy mine. The darkest areas are intergrowths of chalcopyrite and pyrite. They fringe the zinc blende and are intergrown with it and green garnet. The groundmass is calcite. Salt Lake County, Utah. 1900, plate 37-A in U.S. Geological Survey. Professional paper 38. 1905.
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Photomicrographs showing replacement of metamorphosed and a normal calcareous shale. Intergrowth of chalcopyrite and pyrite replacing quartz, from no. 4 level Highland Boy mine. The chalcopyrite and pyrite encircle and replace the quartz of an entirely silicified limestone. This section from a specimen from an upper level shows evidences of superficial alteration not apparent in the reproduction. The margins of the sulphides are tarnished, simulating peacock ore. Salt Lake County, Utah. 1900, plate 35-A in U.S. Geological Survey. Professional paper 38. 1905.