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rocks minerals common to west boulder county

  • BASIN: Mineral Resources in the Boulder Area

    Boulder County has a long and colorful history of mining. ... above are extracted from "hard rock" mines in the granitic and metamorphic rocks west of Boulder.

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  • Colorado Rockhounding - PeakToPeak.com

    The purpose of this web page is to explain what types of minerals can be found in Colorado. Emphasis will be focused on crystalized specimens, although...

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  • Ward District, Boulder Co., Colorado, USA - Mindat

    Ward District, Boulder Co., Colorado, USA : The Ward district takes in the headwaters of Lefthand Creek and Fourmile Creek and includes the area near Sunset and Copper Rock. The town of Ward is 12 miles west of the mountain front and about 19 ... ... Post-mineral faulting is common, but the displacement of the veins is...

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  • Geology - City of Boulder

    The sedimentary rocks that make up the Fountain Formation formed from ... "drawbridge" can be seen dipping to the west on the Colorado western slope. ... Known as the Boulder Creek granodiorite, this rock is the oldest found in the Boulder area. ... Initially a molten mineral "soup", this material cooled and hardened to form...

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  • Rockhounding Colorado

    In addition, Colorado has an amazing variety of minerals and gemstones, ... found only in the Yule Creek Valley in the West Elk Mountains of Colorado (south of the .... Group that can be traced from Boulder, Colorado to northern New Mexico.

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  • TUNGSTEN DEPOSITS OF BOULDER COUNTY, COLORADO

    The tungsten district of Boulder County, Colo., ia a narrow belt trending west-aouthweat and about 10 milea long, in the ... ited in pre-mineral fault fissures where open spaces were form- ed during .... found. The ferberite commonly forms the matrix of a breccia of country rock and early vein quartz, and seams of nearly pure.

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  • Geology and Uranium Deposits of the Caribou Area, Boulder County ...

    Caribou Silver Mines, Inc., in Boulder County, Colo., during the reopening of ... abandoned town of Caribou, 17 miles west of Boulder and 4 miles northwest of .... lead-silver deposits throughout the Front Range mineral belt; the presence of ... monzonite are few, but fresh rock can be found in many prospect pits and on the...

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  • Mineral Classics - Colorado Minerals!

    Over 200 specimens of assorted minerals from throughout Colorado, ranging ... colorado712/co712b01a Tellurium from El Moro Mine, Boulder County, Colorado [. ... Tellurium is not common to find isolated in nature, and arguably the finest ..... crystallized “balls” of beautiful soft purple Creedite sitting on host rock matrix.

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  • Colorado Minerals by Erin Allen - Emporia State University

    This mineral rich belt stretches from Boulder to the La Plata Mountains just north ... amateur rockhound found the largest cavity of aquamarine containing rock ever .... The Cotter Corporation had uranium mines near Canon City and in the west,...

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  • Geology and Ore Deposits of the Boulder County Tungsten District ...

    Boulder Creek granite and related rocks. ____. Distribution and ... Principal rocks of the district — Continued ...... Mountain, 4 miles west of Boulder, west-southwestward to the .... Many minerals have been found in the veins of the tungsten.

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