Gold Quartz Veins of the Alleghany District, California

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Description

From Outline of the Report: The Alleghany district, in the southern part of Sierra County, Calif., has long been famous for the high-grade gold ore of its quartz veins. The oldest rocks of the district (pp. 6-17) are of sedimentary and volcanic origin and correspond to part of the Calaveras formation as mapped in the Colfax and Downieville folios of the Geologic Atlas of the United States. These rocks are divided into five formations, of which three-the Blue Canyon, Relief, and Cape Horn formations follow the definitions laid down by Lindgren in the Colfax folio, and two-the Tightner and Kanaka … continued below

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vi, 139 p. : ill., maps ; 28 cm.

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Ferguson, Henry G. & Gannett, Roger W. 1932.

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This report is part of the collection entitled: Technical Report Archive and Image Library and was provided by the UNT Libraries Government Documents Department to the UNT Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 447 times, with 8 in the last month. More information about this report can be viewed below.

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From Outline of the Report: The Alleghany district, in the southern part of Sierra County, Calif., has long been famous for the high-grade gold ore of its quartz veins. The oldest rocks of the district (pp. 6-17) are of sedimentary and volcanic origin and correspond to part of the Calaveras formation as mapped in the Colfax and Downieville folios of the Geologic Atlas of the United States. These rocks are divided into five formations, of which three-the Blue Canyon, Relief, and Cape Horn formations follow the definitions laid down by Lindgren in the Colfax folio, and two-the Tightner and Kanaka formations-are new units required by the more detailed nature of the present study. It is thought possible that a conglomerate which forms the basal part of the Kanaka formation is of glacial origin. Intrusions of gabbro and more basic rocks, the latter now completely serpentinized, crop out over nearly half the area in which pre-Tertiary rocks are exposed. Small granitic dikes of later age than the basic intrusives are found in the western part of the district. Overlying and largely concealing the older rocks are auriferous gravel of Eocene and Miocene age,
andesitic breccia of probable Miocen age, basalt flows of probable Pleistocene age, and minor amounts of Pleistocene and Recent gravel.

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vi, 139 p. : ill., maps ; 28 cm.

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  • OCLC: 891572339
  • SuDoc Number: I 19.16:172
  • Report No.: Professional Paper 172
  • Archival Resource Key: ark:/67531/metadc784441

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  • 1932

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  • July 30, 2017, 8:43 a.m.

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  • Jan. 11, 2018, 3:23 p.m.

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Ferguson, Henry G. & Gannett, Roger W. Gold Quartz Veins of the Alleghany District, California, report, 1932; Washington D.C.. (https://digital.library.unt.edu/ark:/67531/metadc784441/: accessed April 13, 2026), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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