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The stratigraphic and structural controls of the uranium deposits on Long Mountain, Fall River County, South Dakota

Trace Elements Investigations 425

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Abstract

Numerous occurrences of uranium have been found in the Long Mountain area, Fall River County, S. Dak. Correlation diagrams prepared from drill, cores obtained from the U.S. Atomic Energy Commission indicate that the uranium is most abundant in two sandstone units, separated by mudstone in the Lakota sandstone of Early Cretaceous age. The lower uraniferous unit is composed of thick beds of very fine- to fine-grained sandstone with a few interfingering lentils of mudstone. The upper uraniferous unit is composed of interfingering beds of very fine-, fine-, and coarse-grained sandstone and mudstone.

The uranium deposits on Long Mountain and in the area to the west are most numerous in a northeast-trending zone about a mile wide between two normal faults. The deposits between these faults are in two groups of different trend; the northern group has been incompletely explored.

The sedimentary structures of the upper and lower mineralized sandstone between the faults have controlled the deposition of uranium and vanadium.

Study Area

Additional publication details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
The stratigraphic and structural controls of the uranium deposits on Long Mountain, Fall River County, South Dakota
Series title:
Trace Elements Investigations
Series number:
425
Year Published:
1954
Language:
English
Publisher:
U.S. Geological Survey
Publisher location:
Washington, D.C.
Description:
Report: 23 p.; 7 plates: 37.55 x 22.23 inches or smaller
Country:
United States
State:
South Dakota
County:
Fall River County
Other Geospatial:
Long Mountain
Online Only (Y/N):
N
Additional Online Files (Y/N):
Y