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Geology and Mineral Deposits of the Cargo Muchacho Mountains, Imperial County, California

Henshaw, Paul C. (1942) Geology and Mineral Deposits of the Cargo Muchacho Mountains, Imperial County, California. California Journal of Mines and Geology, 38 . pp. 147-196. ISSN 0096-1558.

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The study of the Cargo Muchacho Mountains presents the first account of the geology of southeasternmost California. In these mountains pre-Mesozoic kyanite schist and arkosite are intruded by a series of granitoid rocks probably Mesozoic in age. The two youngest rocks of this series were formed by granitization of arkosite. Andesite dikes of minor importance intruded the area probably in Tertiary time. Remnants of a once extensive flow of olivine basalt cover a few outlying hills. Alluvial deposits of three distinct ages occur in the area. Two of these, which are prebasalt in age, offer evidence that the Colorado River formerly flowed through the region. The Cargo Muchacho Mountains constitute an important goldmining district. The occurrence of the ore is shown to have been controlled by the regional structure. The ore deposits are mesothermal and are locally characterized by extreme alteration of the wall rock. Kyanite and sericite are also mined in the district. The record of mining activity and production of the district is brought up to date.

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Additional Information:© 1942 California State Mining Bureau. Manuscript submitted for publication September 12, 1940. Minor thesis submitted in partial fulfillment of the requirements for the degree of PhD., Balch Graduate School of the Geologic Sciences, California Institute of Technology, Pasadena.
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Balch Graduate School of the Geological Sciences303
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ID Code:109992
Deposited By: Tony Diaz
Deposited On:26 Jul 2021 19:13
Last Modified:26 Jul 2021 19:13

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