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Photomicrograph of high-grade gold ore from shaft ore shoot, 1,100-foot level, Slide mine, showing native gold (g) associated with roscoelite (r) and quartz (q). Boulder County, Colorado. Notes: Publushed as figure LXXIV-C in U.S.Geological Survey. Professional Paper 223. 1950.
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Album caption and index card: Photomicrograph of pre-Cambrian replacement ore from Malachite mine. Pyrrhotite (p) and sphalerite (s) replaced amphibole (a). Boulder County, Colorado. Notes: Published as figure XVII-C in U.S.Geological Survey. Professional Paper 223. 1950.
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Album caption and index card: Part of the Maxwell breccia reef, showing the polished and groove face of the Maxwell breccia reef. The direction of the grooves (g) is indicated by the arrow. The large-scale chatter mark (c) or "pressed in" structure shows that the west wall (toward the observer) has moved down with respect to the one pictured. Boulder County, Colorado. Notes: Published as figure XX-B in U.S.Geological Survey. Professional Paper 223. 1950.
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Album caption: View east up French Gulch (left middleground). Surface buildings of Wellington mine (Oro shaft). Right middleground in timber is the Country Boy mine. Prominent hill in center is Mineral Hill. Creek channel shows dredge tailings. Summit County, Colorado. ca. 1927.
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Album caption and index card: Photomicrograph of diabase from dike on Hager Mountain northwest of Loveland Pass, representative of the diabase dike rocks of group 2. a. Augite; i, iron ore (ilmenite); p, plagioclase (labradorite). Polarized light. Boulder County, Colorado. Notes: Published as figure X-E in U.S.Geological Survey. Professional Paper 223. 1950.
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Album caption and index card: Photomicrograph of porphyritic hornblende diorite of group 4 from Swan River 2 miles south of Tiger [extinct mining town], showing reaction series. Core of augite (a) bordered by hornblende (h) which in turn is completely rimmed by biotite (b). Cross nicols. Boulder County, Colorado. Notes: Published as figure X-F in U.S.Geological Survey. Professional Paper 223. 1950.
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Aerial view looking southwest across Overland Mountain toward James Peak from an altitude of 9,300 feet near Jamestown; shows type locality of the Overland Mountain erosion surface and the transition belt were it merges with the higher erosion surfaces near the crest of the range. The dumps in the left middle ground are those of the John Jay mine. Colorado. Circa 1932. Figure 2 with sketch, in U.S.Geological Survey Professional paper 223. 1950.
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Album caption and index card: Typical Swandyke hornblende gneiss. Shows strike and dip of the foliation and pitch of the linear structure in the plane of foliation. The handle of the hammer indicates the linear structure pitching to the right about 60°. Headwaters of the North Fork of Swan River 2 miles southwest of Montezuma. Summit County, Colorado. Notes: Published as figure VIII-A in U.S.Geological Survey. Professional Paper 223. 1950.
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Oblique aerial view looking southward toward Loveland Pass; showing Revenue Mountain on the extreme left to Keystone Mountain on the extreme right. Clear Creek and Summit Counties, Colorado. circa 1933. Plate 2-A, with sketch, in U.S. Geological Survey. Professional paper 178. 1935.
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Album caption and index card: Photomicrograph of porphyritic granodiorite typical of rocks of group 4 from stock half a mile south of Jamestown. The primary alinement of feldspars responsible for the platy structure of the intrusive is clearly shown. i, Ilmenite; h, hornblende; p, plagioclase (andesine); q, quartz; t, titanite. Crossed nicols. Boulder County, Colorado. Notes: Published as figure XIII-A, in U.S.Geological Survey. Professional Paper 223. 1950.
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Album caption and index card: Looking east at barren part of the main Clyde vein at the east end of the stope on the tunnel level. Boulder County, Colorado. Notes: Published as figure LVIII-F in U.S.Geological Survey. Professional Paper 223. 1950.
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West face of Tungsten Vein, 100 feet level, looking west; following track of schist; down-throw on the north. Boulder County, Colorado. 1930.
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Album caption and index card: Photomicrograph of rhyolite porphyry of group 7 from dike 1 mile north of Argentine Pass. The phenocrysts have borders of fine-grained oriented quartz in the groundmass. o, sericitized orthoclase; q, quartz. Crossed nicols. Boulder County, Colorado. Notes: Published as figure XIII-C in U.S.Geological Survey. Professional Paper 223. 1950.
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Aerial view looking south-southwest across Allens Park from an altitude of 14,800 feet about 5 miles east of Longs Peak. The rugged topography characteristic of the Continental Divide is shown in the background and the transition from the high glaciated country near the middle of the range to the bench like erosion surfaces that border it is shown in the foreground. This transition zone almost coincides with the lower limit of glaciation. Colorado. Circa 1932. Figure 3 with sketch, in U.S.Geological Survey Professional paper 223. 1950.
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Album caption and index card: Photomicrograph of Boulder Creek granite from ridge half a mile east of junction of Middle Boulder and North Boulder Creeks. Primary gneissic structure indicated by quartz- oligoclase contact and by biotite is nearly horizontal in photograph. Slight secondary shearing shown by undulatory extinction of quartz in upper right. b, biotite; o, oligoclase; q, quartz. Polarized light. Boulder County, Colorado. Notes: Published as figure X-C in U.S.Geological Survey Professional paper 223. 1950.
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Typical exposure of Swandye hornblende gneiss near head of St. Johns Gulch, the gneissic structure of the dark gray hornblende gneiss is accentuated by the parallel and crosscutting light gray seams of pegmatite and aplite. The dip of the formation is nearly horizontal at this outcrop, which is near the crest of an anticline. Summit County, Colorado. circa 1927. Plate 7-A, U.S. Geological Survey, Professional paper 178. 1935.
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Album caption and index card: Specimen typical of better grade ore from Alice mine. Original monzonite porphyry completely converted to coarse grained sercicite (s) and cut by open interlacing fractures partly filled with clear quartz on which rests clumps of pyrite (p) chalcopyrite. Supergene sooty chalcocite (c) incrusts the chalcopyrite and assays high in gold. (q) Quartz. Summit County, Colorado. Notes: Published as figure LX-C in U.S.Geological Survey. Professional Paper 223. 1950.
map background search result map search result map Wellington mine. French Creek just beyond the mine. Breckenridge district. Summit County, Colorado. 1926. View East up French Gulch. Surface buildings of Wellington mine. Summit County, Colorado. 1927. A barren portion of the Tungsten vein in the Tungsten (Chance) mine. Boulder County, Colorado. 1930. Mesa Verde National Park, Colorado. Looking north from Balcony House. 1931. Typical Swandyke hornblende gneiss. Summit County, Colorado. circa 1932. Photomicrograph of Boulder Creek granite from east of junction of Middle Boulder and North Boulder Creek. Boulder County, Colorado. circa 1932. Photomicrograph of diabase from dike on Hager Mountain, northwest of Loveland Pass. Boulder County, Colorado. circa 1932. Photomicrograph of porphyritic hornblende diorite taken from Swan River. Boulder County, Colorado. circa 1932. Photomicrograph of porphyritic granodiorite. Boulder County, Colorado. circa 1932. Photomicrograph of rhyolite porphyry. Boulder County, Colorado. circa 1932. Photomicrograph of pre-Cambrian replacement ore from malachite mine. Boulder County, Colorado. circa 1932. View showing the polished and grooved face of the Maxwell breccia reef. Boulder County, Colorado. circa 1932. Specimen typical of better-grade ore from Alice mine. Summit County, Colorado. 1932. Looking east at barren part of the main Clyde vein at the east end of the stope on the tunnel level. Boulder County, Colorado. circa 1932. Photomicrograph of high-grade gold ore from shaft ore shoot, 1,100-foot level, Slide mine. Boulder County, Colorado. circa 1932. Mesa Verde National Park, Colorado. Looking north from Balcony House. 1931. A barren portion of the Tungsten vein in the Tungsten (Chance) mine. Boulder County, Colorado. 1930. Wellington mine. French Creek just beyond the mine. Breckenridge district. Summit County, Colorado. 1926. View East up French Gulch. Surface buildings of Wellington mine. Summit County, Colorado. 1927. Typical Swandyke hornblende gneiss. Summit County, Colorado. circa 1932. Photomicrograph of Boulder Creek granite from east of junction of Middle Boulder and North Boulder Creek. Boulder County, Colorado. circa 1932. Photomicrograph of diabase from dike on Hager Mountain, northwest of Loveland Pass. Boulder County, Colorado. circa 1932. Photomicrograph of porphyritic hornblende diorite taken from Swan River. Boulder County, Colorado. circa 1932. Photomicrograph of porphyritic granodiorite. Boulder County, Colorado. circa 1932. Photomicrograph of rhyolite porphyry. Boulder County, Colorado. circa 1932. Photomicrograph of pre-Cambrian replacement ore from malachite mine. Boulder County, Colorado. circa 1932. View showing the polished and grooved face of the Maxwell breccia reef. Boulder County, Colorado. circa 1932. Specimen typical of better-grade ore from Alice mine. Summit County, Colorado. 1932. Looking east at barren part of the main Clyde vein at the east end of the stope on the tunnel level. Boulder County, Colorado. circa 1932. Photomicrograph of high-grade gold ore from shaft ore shoot, 1,100-foot level, Slide mine. Boulder County, Colorado. circa 1932.