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GEOREF RECORD

A study of the geology and ore deposits of the Ashbrook silver mining district, Utah

Victor Edwin Peterson
A study of the geology and ore deposits of the Ashbrook silver mining district, Utah
Economic Geology and the Bulletin of the Society of Economic Geologists (September 1942) 37 (6): 466-502

Abstract

The ore of the Ashbrook district occurs as irregular patchy replacement deposits in fractured and folded limestone, whose structure has strongly influenced distribution of the orebodies. The distribution is controlled by small crenulations within the limestone, the apical portions of which are usually marked by a strong development of secondary calcite, which is generally more susceptible to replacement by mineralizing solutions. Due to two episodes of minor fracturing, the sequence of primary mineralization can be devided into three periods of deposition: (1) rhodochrosite to the exclusion of other minerals, (2) quartz, pyrite, arsenopyrite, sphalerite, and minor amounts of chalcopyrite, and (3) galena, argyrodite, pyrargyrite, pearceite, tennantite, and an unidentified mineral. The second phase seems to be responsible for the minor gold values in the ores. Processes of enrichment and oxidation have produced a large group of secondary minerals. Alteration of the primary silver minerals has been mainly to argentite and native silver which together account for the main values found in the ores.


ISSN: 0361-0128
EISSN: 1554-0774
Coden: ECGLAL
Serial Title: Economic Geology and the Bulletin of the Society of Economic Geologists
Serial Volume: 37
Serial Issue: 6
Title: A study of the geology and ore deposits of the Ashbrook silver mining district, Utah
Pages: 466-502
Published: 194209
Text Language: English
Publisher: Economic Geology Publishing Company, Lancaster, PA, United States
Accession Number: 1949-013191
Categories: Areal geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. geol. sketch map
N37°00'00" - N42°00'00", W114°04'60" - W109°04'60"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Society of Economic Geologists. Reference includes data from Bibliography and Index of North American Geology, U. S. Geological Survey, Reston, VA, United States
Update Code: 1949
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