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The Leyden uranium prospect, Jefferson County, Colorado
The Leyden uranium prospect is in sec. 28, T, 2 S., R. 70 W, Jefferson County, Cplo, Examination of the property was made in February 1950. Uranium was first reported in this locality in 1875 by Captain E. L. Berthoud, who noted uranium minerals associated with the main coal bed. The Old Leyden coal mine workings have long been abandoned and caved, but specimens of the uranium-bearing rock can be seen on the old dump 700 feet to the south. The mineralized coal bed is 10 to 12 feet thick and occurs near the base of the Laramie formation of Upper Cretaceous age. Uranium minerals are present in the form of yellow incrustations and inclusions in fractured and partly silicified coal. Petrographic studies indicate that the silica and uranium minerals were deposited after deposition and carbonization of the coal. Secondary uranium minerals also were found by C. R. Butler along the outcrop of the sandstones in the Laramie formation. No uranium minerals were found in place by the writer, but four samples from the dump contained 0.001, 0,005, 0.17 and 0.69 percent uranium.
A radiometric examination of the Tunnel Site No. 1 Claim Grant County, New Mexico
No abstract available.
Preliminary report on gamma-ray distribution in cylindrical cavities (drill holes)
No abstract available.
Preliminary statement of the analyses of ground water from the Morrison Formation, southwestern Colorado and southeastern Utah
As part of a study of the carnotite deposits of the Colorado Plateau,, samples of ground water from the Salt Wash sandstone and Brushy Basin shale members of the Morrison formation have been analyzed to determine their chemical character and metal content. The Salt Wash ground water is largely a bicarbonate solution with variable amounts of calcium and magnesium ions; that from the Brushy Basin is either a sulfate or bicarbonate solution with sodium, The ground water from the Salt Wash and Brushy Basin members is generally weakly alkaline In most samples, the metal ions of uranium, vanadium, copper, lead, and selenium are present in amounts of less than 1 part per million. It is concluded that if the ground water responsible for introduction of the uranium and vanadium metals into the Salt Wash was comparable to the recent ground water, it contained very small amounts of the metal ions.
Radioactive ilmenite, Virginia Claim, Hillsboro Mining District, Sierra County, New Mexico
No abstract available.
Geology of the area adjacent to the Free Enterprise uranium-silver Mine, Boulder District, Jefferson County, Montana
Uranium minerals.occur in pods associated with cryptocrystalline silica, silver minerals, and scattered sulfide mineral grains in a hydrothermal vein that cuts quartz monzonite and alaskite at the Free Enterprise mine, 2 miles west of Boulder, Mont. The Free Enterprise vein is one of many silicified reef-like structures in this area, most of which trend about N. 60° E. The cryptocrystalline silica zones of the area are lenticular and are bordered by an altered zone where quartz monzonite is the wall rock. No alteration was noticed where alaskite is adjacent to silica zones. No uranium minerals were observed at the surface, but radioactivity anomalies were noted at 57 outcrops. Underground mining has shown that leaching by downward percolating waters has removed most of the uranium from the near-surface part of the Free Enterprise vein and probably has enriched slightly, parts of the vein and the adjacent wall rock from the bottom of the leached zone to the ground-water level. It is possible that other veins that show low to moderate radioactivity at the surface may contain significant concentrations of uranium minerals at relatively shallow depth. The quartz monzonite appears to be a more favorable host rock for the cryptocrystalline silica and associated uranium minerals than the alaskite. The alaskite occurs as vertical_dikes plug-like masses, and as irregularly shaped, gently dipping masses that are believed to have been intruded into open fractures formed during the cooling of the quartz monzonite.
Modification to Tracerlab Automatic Sample Changer
The U.S. Geological Survey has recently modified the Tracerlab Automatic Sample Changer so that the geometry is greatly improved for counting larger low-activity samples in finely ground form. The larger sample and larger Geiger Mueller tubes allow a greater number of samples to be counted per hour with the same statistical accuracy.
Uranium occurrence at the Hoerner-Ross pegmatite, Cady Mountains, San Bernadino County, California
No abstract available.
The Papsy's Hope autunite prospect, Marysvale District, Piute County, Utah
The Papsy's Hope autunite prospect is in the eastern part of the Marysvale district, Piute County, Utah, about 1 1/2 miles northeast of the mines now operating. It is developed by two shallow cuts and a short incline shaft. One cut exposes a zone of fractures, sparse quartz veins, and scattered autunite. Most if the autunite is exposed within a north-south distance of 17 feet. The trend of the zone is not known. Samples across the autunite-bearing zone average 0.026 percent equivalent uranium. The deposit is in feldspar porphyry of the older Tertiary (Bullion Canyon) volcanics. The intrusive quartz monzonite that contains the deposits now being mined is in contact with quartz porphyry similar to the rocks exposed about 1500 feet west if the Papsy’s Hope prospect. In comparing the Papsy’s Pope prospect with the deposits now being mined, two major correlations have been observed. (1) The deposits at the Papsy’s Hope prospect and those at the Bullion Monarch and Prospector mined are immediately beneath the old erosion surface at the base if the y0ounger tertiary volcanics. The younger volcanics are still present a short distance to the nrth and south of the Papsy’s Hope perospect. (2) The deposits at the Papsy’s Hope prospect and at the Prospector mine are associated with completely silicified outcrops. These correlations may prove of value for prospecting, and further study of the m is in progress. Further prospecting would be necessary to determine the trend of the autunite-bearing zone and to expose it at greater depth. This could be done by trenching across the probable northeast-southwest trend of the zone, by drilling, and either extending the present inclines shaft, or, preferably, driving a new incline at a lower level.
The Papsy's Hope Autunite Prospect, Marysville District, Piute County, Utah
No abstract available.
Results of diamond drilling, Merry Widow Claim, White Signal, Grant County, New Mexico
No abstract available.
Results of diamond drilling, Merry Widow Claim, White Signal, Grant County, New Mexico
No abstract available.
Airborne radioactivity survey of the Red Desert region, Sweetwater County, Wyoming
No abstract available.