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Reconnaissance examination of the uranium deposits northeast of Winston, Broadwater County, Montana

Trace Elements Memorandum 917

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Abstract

Anomalous radioactivity and a yellow secondary uranium mineral tentatively identified as carnotite have been found in Tertiary sedimentary rocks about 3 miles northeast of Winston, Mont. The uranium is in tuffs and tuffaceous shales and particularly in beds rich in organic matter. Carnotite(?) was identified from three localities, principally coating fractures but in places part replacing organic material, and anomalous radioactivity without recognizable uranium minerals has been detected at four localities. Six of the seven localities are at approximately the same stratigraphic horizon. The deposits are virtually unexplored and consequently their size and grade are not known. Selected specimens assay as high as 0.36 percent eU. Exploitable deposits of uranium may be found in this area, as well as in similar areas of western Montana that are underlain by Tertiary tuffaceous rocks.

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Reconnaissance examination of the uranium deposits northeast of Winston, Broadwater County, Montana
Series title:
Trace Elements Memorandum
Series number:
917
Edition:
-
Year Published:
1955
Language:
ENGLISH
Description:
10 p.; 1 fig. ; 26 cm.