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Filters: Tags: Mills, Mines, Quarries (X) > partyWithName: Bastin, Edward Sunderland (X)

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Photomicrograph of polished section of pitchblende ore from the Wood Mine, Quartz Hill, Gilpin County, Colorado; showing botryoidal forms characteristic of much of the pitchblende, Py marks pyrite. Plate 2-B, with graphics, in U.S. Geological Survey. Professional paper 90. 1915.
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Electrum showing crystal outlines associated with quartz and sulphides. The argentite was very probably formed by the replacement of galena, but all the other minerals are believed to be alpha hypo gene. Photomicrograph of polished surface of ore from 1,260- foot level, Murray vein, Tonopah Extension mine. Nye County, Nevada. 1915. Plate 5- B, with graphics, in U.S. Geological Survey. Professional paper 104. 1918.
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Irregular intergrowth of polybasite, probably alpha hypo gene, with quartz and pyrite; photomicrograph of polished surface of ore just above 500-foot level, West End vein, West End mine. Nye County, Nevada. 1915. Plate 4-A, with graphics, in U.S. Geological Survey. Professional paper 104. 1918.
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Muscovite-rich zones in pegmatite, G.D. Willes Feldspar quarry, Topsham Sagadahoc County, Maine. 1906. Plate 9-A in U.S. Geological Survey. Bulletin 445. 1911.
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General view of the tourmaline quarry at Mount Mica in November 1908, looking west, the upper layers of rock in the middle ground are the schist capping. Oxford County, Maine. 1908.
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Electrum (stippled) irregularly intergrown with sphalerite and quartz; the argentite shown in this photograph was probably formed by the replacement of (beta hypo gene) of galena all the other minerals, including the electrum, are believed to be alpha hypo gene; Photomicrograph of polished surface of ore from 1,050-foot level, Macdonald vein, North Star Mine. Nye County, Nevada. 1915.
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Banded hypo gene ore: Murray vein, Tonopah Extension mine, just below 950-foot level, one-half natural size. Nye County, Nevada. 1915. Portion is plate 1-B in U.S. Geological Survey. Professional paper 104. 1918.
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Polybasite probably super gene partly filling fractures in white, opaque quartz; in a few places finely crystalline chalcopyrite and in one place a little native silver are deposited on the polybasite, Macdonald vein, Montana-Tonopah mine. Nye County, Nevada. 1915. Plate 12-A in U.S. Geological Survey. Professional paper 104. 1918.
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Reproduction of an old photograph of the Mount Mica tourmaline mine at the time when the pocket-bearing zone was close to the surface. A stick marks the position of each pocket with white card attached. Photo by T.F. Lamp. Oxford County, Maine. Plate 12 in U.S. Geological Survey. Bulletin 445. 1911.
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Sphalerite traversed by minute veinlets of chalcopyrite and polybasite; some of the veinlets in sphalerite are continuous with areas of the same minerals replacing galena this feature does not show in the picture. The veinlets are in the main formed by replacement, though possibly in small part fracture fillings. Photomicrograph of polished surface of ore from hanging-wall branch of Belmont vein, 1,200-foot level, Tonopah-Belmont mine. Nye County, Nevada. 1915. Plate 8-A, with graphics, in U.S. Geological Survey. Professional paper 104. 1918.
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Irregular fine aggregates of carbonate, argentite, and chalcopyrite intergrown with ore minerals in larger grains; photomicrograph of polished surface of ore from Favorite vein, Tonopah-Belmont mine. Nye County, Nevada. 1915. Plate 6-B, with graphics, in U.S. Geological Survey. Professional paper 104. 1918.
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Partial replacement of galena by fine aggregate of a light-colored carbonate, argentite and some chalcopyrite; there has been a slight replacement of the quartz. Photomicrograph of polished surface of ore from Favorite vein, Tonopah-Belmont mine, depth uncertain. Nye County, Nevada. 1915. Plate 9-A in U.S. Geological Survey. Professional paper 104. 1918.
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Peripheral replacement of galena by an association of argentite and electrum (stippled); note the smoothness of the galena border in passing from contact with argentite to contact with electrum. Photomicrograph of polished surface of ore from 1,250-foot level Murray vein, Tonopah Extension mine. Nye County, Nevada. 1915. Plate 9-B in U.S. Geological Survey. Professional paper 104. 1918.
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Specimen: ore of composite type from Fourth of July mine, near Central City; pyretic ore has been brecciated and the fractures filled by ore of the galena-sphalterite type. Colorado. Circa 1911. Plate 11-C, natural size, in U.S.Geological Survey. Professional paper 94. 1917.
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Replacement of galena by polybasite; between these two minerals occur narrow bands of an unidentified transition mineral (not visible in the picture), and the very narrow light colored bands that mark the initiation of the replacement process along the contacts between galena crystals consist of this mineral. Photomicrograph of polished surface of ore from Favorite vein, Tonopah-Belmont mine, depth uncertain. Nye County, Nevada. 1915. Plate 7-B, with graphics, in U.S. Geological Survey. Professional paper 104. 1918.
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Irregular veinlet of sphalerite (smooth light gray) and argentite (rough light gray), bordered by quartz (dark gray), with scattered irregular areas of sphalerite; the sphalerite- argentite veinlet is believed to mark a line of easy replacement in the original rock. All the minerals are interpreted as alpha hypo gene. Photomicrograph of polished surface of ore from stope 600 C, West End vein, West End mine. Nye County, Nevada. 1915. Plate 3-B in U.S. Geological Survey. Professional paper 104. 1918.
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Supposed hypo gene veinlets of pyrargyrite: the veinlets pass from areas partly altered wall rock to quartz areas and become less well defined in the quartz; natural size, Tonopah Extension mine, exact location uncertain. Nye County, Nevada. 1915. Plates 2-A and B, with graphics, in U.S. Geological Survey. Professional paper 104. 1918.