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Geology of the Shinarump No. 1 uranium mine, Seven Mile Canyon area, Grand County, Utah

Trace Elements Investigations 287

This report concerns work done on behalf of the Division of Raw Materials of the U.S. Atomic Energy Commission.
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DOI: 10.3133/tei287

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Abstract

The Shinarump No. 1 uranium mine is located about 12 miles northwest of Moab, Utah, in the Seven Mile Canyon area, Grand County, Utah. A study was made of the geology of the Shinarump No. 1 mine in order to determine the habits, ore controls, and possible origin of the deposit.


Rocks of Permain, Triassic, and Jurassic age crop out in the area mapped. Uranium deposits are found in three zones in the lower 25 feet of the Upper Triassic Chinle formation. The Shinarump No. 1 mine, which is in the lowermost zone, is located on the west flank of the Moab anticline near the Moab fault.


The Shinarump No. 1 uranium deposit consists of discontinuous lenticular layers of mineralized rock, irregular in outline, that, in general, follow the bedding. Ore minerals, mainly uranite, impregnate the rock. High-grade seams of uranite and chalcocite occur along bedding planes. Formation of unraninite is later than or simultaneous with most sulfides. Chalcocite may be of two ages, with some being later than uraninite. Uraninite and chalcocite are concentrated in the poorer sorted parts of siltstones. Guides to ore in the Seven Mile Canyon area inferred from the study of the Shinarump No. 1 deposit are the presence of bleached siltstone, copper sulfides, and carbonaceous matter. Results of spectrographic analysis indicated that the mineralizing solutions contained important amounts of barium, vanadium, uranium, and copper as well as lesser amounts of strontium, chromium, boron, yttrium, lead, and zinc.


The origin of the Shinarump No. 1 deposit is thought to be hydrothermal, dated as later or early.

Study Area

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Geology of the Shinarump No. 1 uranium mine, Seven Mile Canyon area, Grand County, Utah
Series title:
Trace Elements Investigations
Series number:
287
DOI:
10.3133/tei287
Edition:
-
Year Published:
1953
Language:
English
Description:
Report: 36 p.; Plate 1: 27.87 x 20.69 inches; Plate 2: 20.84 x 15.99 inches; Plate 3: 14.74 x 10.34 inches
Country:
United States
State:
Utah
County:
Grand County
Other Geospatial:
Seven Mile Canyon Area