Filters: Tags: Montana Professional Paper 74 (X)

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Faulted veinlets of chalcocite and quartz pyrite ore; Mountain View mine, 600 foot level, south crosscut, north vein, east vein. Faulted veinlets of chalcocite and quartz pyrite ore; Mountain View mine, 600 foot level, south crosscut, north vein, east vein. Jefferson County, Montana. Circa 1900. Plate 16-B in U.S. Geological Survey. Professional paper 74. 1912. Categories: Image; Tags: Mines, Montana Professional Paper 74, Professional Papers, photo print Sheeted granite north of Meaderville, along Great Northern railway, showing weathering along joint planes, some of which are mineralized and form veins. Sheeted granite north of Meaderville, along Great Northern railway, showing weathering along joint planes, some of which are mineralized and form veins. Jefferson County, Montana. Circa 1900. Plate 5-A in U.S. Geological Survey. Professional paper 74. 1912. Categories: Image; Tags: Montana Professional Paper 74, Professional Papers, photo print Sheeted granite of boulder batholith near Homestake tunnel. Jefferson County, Montana. Circa 1900. Sheeted granite of boulder batholith near Homestake tunnel. Jefferson County, Montana. Circa 1900. Plate 2-B in U.S. Geological Survey. Professional paper 74. 1912. Categories: Image; Tags: Montana Professional Paper 74, Professional Papers, photo print General view of western part of Butte district, including the Butte. Jefferson County, Montana. General view of western part of Butte district, including the Butte. Jefferson County, Montana. Circa 1900. Plate 2-A in U.S. Geological Survey. Professional paper 74. 1912. Categories: Image; Tags: Montana Professional Paper 74, Professional Papers, photo print Disintegration boulders, in place, surrounded by soft sandy disintegrated granite, shows manner of formation of the boulders and their relation to sheeting planes of the granite. Disintegration boulders, in place, surrounded by soft sandy disintegrated granite, shows manner of formation of the boulders and their relation to sheeting planes of the granite. Railway cut at west portal of Homestake tunnel, east of Butte, on Northern Pacific railway. Jefferson County, Montana. Circa 1900. Plate 5-B in U.S. Geological Survey. Professional paper 74. 1912. Categories: Image; Tags: Formations, Montana Professional Paper 74, Professional Papers, photo print Decomposition boulders formed by vein making agencies in granite; north crosscut, 800 foot level, Gagnon mine. Decomposition boulders formed by vein making agencies in granite; north crosscut, 800 foot level, Gagnon mine. Jefferson County, Montana. Circa 1900. Plate 6-A in U.S. Geological Survey. Professional paper 74. 1912. Categories: Image; Tags: Mines, Montana Professional Paper 74, Professional Papers, photo print Mineralization along joints in granite, Rarus mine, south crosscut, seventh level. Incipient vein formation, veinlets of quarts and pyrite. Mineralization along joints in granite, Rarus mine, south crosscut, seventh level. Incipient vein formation, veinlets of quarts and pyrite. Jefferson County, Montana. Circa 1900. Plate in U.S. Geological Survey. Professional paper 74. 1912. Categories: Image; Tags: Formations, Mines, Montana Professional Paper 74, Professional Papers, photo print Mineralized joints in granite in an excavation for the foundation of a church a Butte. Jefferson County, Montana. Mineralized joints in granite in an excavation for the foundation of a church a Butte. Jefferson County, Montana. Circa 1900. Plate 4-A in U.S. Geological Survey. Professional paper 74. 1912. Categories: Image; Tags: Montana Professional Paper 74, Professional Papers, photo print