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Filters: Tags: Boulder County, Colorado (X) > partyWithName: Lovering, Thomas Seward (X)

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Album caption and index card: Looking east at the Maxwell breccia reef near the junction of Fourmile Creek and North Boulder Creek. At this exposure the reef consists of brecciated Boulder Creek granite, moderately silicified and stained with hematite. The breccia reef has been mapped previously as pegmatite dike cutting the granite. Boulder County, Colorado. Notes: Published as figure XX-A in U.S.Geological Survey. Professional Paper 223. 1950.
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Album caption and index card: Unmineralized part of tungsten vein 200 feet west of large ore shoot, 100-foot level of Tungsten Vein mine. Note interior faulting and drag in barren sheeted zone (sz), showing the hanging wall (hw) has dropped. Boulder County, Colorado. Notes: Published as figure XXII in U.S.Geological Survey. Professional Paper 223. 1950.
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Album caption and index card: Photomicrograph of gold-tungsten ore from Keklonga mine, Magnolia district. Sylvanite (s) in vuggy quartz (q3) which contains a little pyrite (py). Quartz (q3) and ferberite (fe) cut in early quartz. Boulder County, Colorado. Notes: Published as figure LXXIV-B in U.S.Geological Survey. Professional Paper 223. 1950.
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Album caption and index card: Photomicrograph of quartz-biotite schist from Idaho Springs formation at Nederland. Original bedding (nearly vertical in photograph) is intersected by shear planes sloping down to right at about 45°, and these shears are cut by later shears sloping to the left at 60°. b, Biotite; g, garnet; m, magnetite; q, quartz; fqb, crushed feldspar, quartz, and biotite. Plain light. Boulder County, Colorado. Notes: Published as figure VII-C in U.S.Geological Survey. Professional Paper 223. 1950.
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Album caption and index card: Photomicrograph of intrusion breccia of group 11 from Logan mine, 5 miles west of Boulder. Highly fragmented granite and some porphyry and early vein material lie in a biotite-flecked glassy groundmass that is partly silicified and sericitized. b, Fragment of biotite latite; g, glassy groundmass. Crossed nicols. Boulder County, Colorado. Notes: Published as figure XVII-A in U.S.Geological Survey. Professional Paper 223. 1950.
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Album caption and index card: Photomicrograph of gold-tungsten ore from west end of 280-foot level of Keklonga mine, Magnolia district. Sylvanite (s) in crustified quartz (q₁ and q₂) associated with early coarse-grained ferberite. Fine-grained ferberite with a little quartz lies on the earlier quartz and is in turn incrusted and veined by late quartz (q3) containing some ferberite of three generations (f1, f2, and f3). py, Pyrite. Boulder County, Colorado. Notes: Published as figure LXXIV-A in U.S.Geological Survey. Professional Paper 223. 1950.
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Northwestward across Nederland, showing erosion surfaces; the Flattop, Cheyenne Mountain and Overland Mountain surfaces can be seen. Boulder County, Colorado. 1930. Figure 21, in U.S. Geological Survey. Professional paper 245. 1953.
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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: 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: 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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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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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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Album caption and index card: Photomicrograph of quartz-biotite schist from Idaho Springs formation at Nederland. Original bedding (nearly vertical in photograph) is intersected by shear planes sloping down to right at about 45°, and these shears are cut by later shears sloping to left at 60°. b, biotite; g, garnet; m, magnetite; q, quartz; fgb, crushed feldspar, quartz and biotite. Polarized light. Boulder County, Colorado. Notes: Published as figure IVV-D in U.S.Geological Survey. Professional Paper 223. 1950.
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Album caption and index card: Ore from Queen mine, Ward district, showing wolframite (light gray) and quartz (dark gray) cutting coarse pyrite (white). Boulder County, Colorado. Notes: Published as figure LXVIII-D in U.S.Geological Survey Professional paper 223. 1950.
map background search result map search result map A barren portion of the Tungsten vein in the Tungsten (Chance) mine. Boulder County, Colorado. 1930. Photomicrograph of quartz-biotite schist from Idaho Springs formation at Nederland. Boulder County, Colorado. circa 1932. Photomicrograph of quartz-biotite schist from Idaho Springs formation at Nederland. Boulder 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 intrusion breccia, west of Boulder. Boulder County, Colorado. circa 1932. Photomicrograph of pre-Cambrian replacement ore from malachite mine. Boulder County, Colorado. circa 1932. Looking east at the Maxwell breccia reef near the junction of Fourmile and North Boulder Creeks. Boulder County, Colorado. circa 1932. Unmineralized tungsten vein. Boulder County, Colorado. circa 1932. Ore from Queen mine. Boulder 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. Gold-tungsten ore from west end of 280-foot level of Keklonga mine. Boulder County, Colorado. 1932. Photomicrograph of gold-tungsten ore from Keklonga mine. Boulder County, Colorado. 1932. Photomicrograph of high-grade gold ore from shaft ore shoot, 1,100-foot level, Slide mine. Boulder County, Colorado. circa 1932. A barren portion of the Tungsten vein in the Tungsten (Chance) mine. Boulder County, Colorado. 1930. Photomicrograph of quartz-biotite schist from Idaho Springs formation at Nederland. Boulder County, Colorado. circa 1932. Photomicrograph of quartz-biotite schist from Idaho Springs formation at Nederland. Boulder 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 intrusion breccia, west of Boulder. Boulder County, Colorado. circa 1932. Photomicrograph of pre-Cambrian replacement ore from malachite mine. Boulder County, Colorado. circa 1932. Looking east at the Maxwell breccia reef near the junction of Fourmile and North Boulder Creeks. Boulder County, Colorado. circa 1932. Unmineralized tungsten vein. Boulder County, Colorado. circa 1932. Ore from Queen mine. Boulder 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. Gold-tungsten ore from west end of 280-foot level of Keklonga mine. Boulder County, Colorado. 1932. Photomicrograph of gold-tungsten ore from Keklonga mine. Boulder County, Colorado. 1932. Photomicrograph of high-grade gold ore from shaft ore shoot, 1,100-foot level, Slide mine. Boulder County, Colorado. circa 1932.