Preliminary report on the Clancy Creek area, Jefferson City quadrangle, Jefferson County, Montana
Trace Elements Investigations 257
Work done on behalf of the Division of Raw Materials, U.S. Atomic Energy Commission.
- George E. Becraft
Several radioactivity anomalies and secondary uranium minerals have been found in the Clancy Creek area near the northern margin of the Boulder batholith. These are principally associated with chalcedonic zones that consist of one or more discontinuous stringers and veins of cryptocrystalline silica and fine-grained quartz in silicified quartz monzonite and alaskite. Uranium ore has been produced at the W. Wilson mine from one of these vein zones, and exploration work is being done on another--the G. Washington-A. Lincoln. Some very fine-grained pyrite and minute quantities of other sulfides have been recognized in deposits of this type.
At the Lone Eagle mine small amount of uranium ore has been developed along a siliceous vein that contains sooty pitchblende (?) in small irregular fractures; significant amounts of galena and sphalerite are distributed sporadically along the vein.
In the Clancy Creek area, no anomalous radioactivity has been detected in the pre-batholithic volcanic rocks or in the post-batholithic dacite and andesite.
Additional publication details
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- Publication Subtype:
- USGS Numbered Series
- Preliminary report on the Clancy Creek area, Jefferson City quadrangle, Jefferson County, Montana
- Series title:
- Trace Elements Investigations
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- Year Published:
- U.S. Geological Survey
- Report: 24 p.; 2 Sheets: 18.62 x 18.57 inches and 21.17 x 18.96 inches
- United States
- Jefferson County
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