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Uranium resources in the Silver Reef (Harrisburg) District, Washington County, Utah

Trace Elements Memorandum 214

By:
DOI: 10.3133/tem214

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Abstract

The Silver Reef district is near Leeds, about 16 miles north of St. George, Utah. The major structural feature of the district is the Virgin anticline, a fold extending southwestward toward St 0 George. The anticline has been breached by erosion, and sandstone hogbacks or “reefs” are carved from the Shinarump conglomerate and sandstone members of the Chinle formation, both of Triassic age. Thirteen occurrences of uranium-vanadium minerals, all within the Tecumseh sandstone, which is the upper part of the Silver Reef sandstone member of the Chinle formation, have been examined over an area about l o75 miles wide and 3 miles long.


Two shipments of uranium-vanadium ore have been produced from the Chloride Chief and Silver Point claims. Samples from the deposits contain as much as 0.94 percent U3O8. The ore contains several times as much vanadium oxide as uranium, some copper; and traces of silver. It occurs in thinly bedded cross-bedded shales and sandstones within the fluviatile Tecumseh sandstone member of the Chinle formation. The ore beds are lenticular and are localized near the base, center, and top of this sandstone member. The uranium-vanadium ore contains several yellow and green minerals not yet identified; the occurrences are similar to, but not associated with, the cerargyrite ore that made the district famous from 1879 to 1909.

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Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Uranium resources in the Silver Reef (Harrisburg) District, Washington County, Utah
Series title:
Trace Elements Memorandum
Series number:
214
DOI:
10.3133/tem214
Year Published:
1951
Language:
English
Publisher:
U.S. Geological Survey
Description:
Report: 45 p.; 3 Plates: 40.93 x 26.27 inches and smaller
Country:
United States
State:
Utah
County:
Washington County
Other Geospatial:
Silver Reef