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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: Ore from Shaffer vein, Freeland mine, McClelland tunnel level, 35 feet east of Shaffer raise, 1,325 feet below surface. Ankerite (a) and pyrite (p) broken and cemented by dark fine-grained quartz (q) sphalerite (s) seamed by tetrahedrite (t) which is closely associated with dark quartz (q). Summit County, Colorado. Notes: Published as figure LX-F in U.S.Geological Survey. Professional Paper 223. 1950.
Categories: Image;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Freeland mine,
Lovering, T.S. Collection,
Mills, Mines, Quarries,
Photographers,
Summit County, Colorado, All tags...
photo print, Fewer tags
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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.
Categories: Image;
Types: Map Service,
OGC WFS Layer,
OGC WMS Layer,
OGC WMS Service;
Tags: Boulder County, Colorado,
Keklonga mine,
Lovering, T.S. Collection,
Mills, Mines, Quarries,
Photographers, All tags...
Photomicrographs,
photo print, Fewer tags
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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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