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At least 145 records · Page 8Linked to original sources
USGS1951

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

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 U 3 O 8 . 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.

Utah↗
USGS1951

Garo uranium deposits, Park County, Colorado

The uranium deposits, three-fourths of a mile south of Garo, Park County, Colo., were mined over 30 years ago for radium ore. The old workings are now abandoned and inaccessible. Forty tons of ore that contained 1.0 percent uranium are reported to have been mined from two light-gray sandstone beds that are stratigraphically about 100 feet apart. The minerals reported to occur in these sandstones are carnotite, malachite, azurite, calciovolborthite, and volborthite. The deposits are in close proximity to a radioactive cherty limestone which is one foot thick, that contains as much as 0.01 percent uranium. The uranium in the carnotite and the uranium in the chert may be genetically related. Mr. ¥. H. Gaddis of Hartsel, Colo., has recently attempted to reopen some of the workings, but as of April 1951 this operation had not revealed any significant new data. Future prospecting should be initiated in the two sandstone beds that have been mineralized. The chert can be used as a marker bed in correlating the sandstones from one exposure to another.

Colorado↗
USGS1951

Uranium in the East Walker River Area, Lyon County, Nevada

Uraniferous quartz veins and deposits of other types occur in an area at least six miles long and three miles wide, along the East Walker River in Lyon County, Nevada. Most of the deposits are on the west side of the river. Six properties of areas were mapped, sampled, and tested radiometrically. These properties are: the Far West Willys group, North-west Willys group, West Willys group, Silver Pick property, Grant View hot springs, and the Boerlin ranch radioactive area. The East Walker River area is underlain by coarse-grained porphyritic granite. Cutting the granite are numerous aplite dikes and a few perthite-quartz pegmatites. Faulting was noted in a few places. Radioactive material has been found in the East Walker River area in deposits of four types: (1) quartz veins carrying small amounts of copper, lead, and silver minerals; (2) partly altered granite adjacent to quartz veins; (3) gouge zones, and (4) hot springs. The quartz vein deposits are the most abundant. The uranium minerals pitchblende and kasolite occur in the quartz veins, in aggregates and streaks associated with copper and silver minerals, galena, and barite. In many quartz veins abnormal radioactivity is absent or only locally present. Samples collected from quartz veins contained from 0.001 to 0.14 percent uranium; only five of 46 samples contained over 0.025 percent uranium. Partially altered granite adjacent to the quartz veins in the West Willys No. 7 property contains scattered torbernite, but the highest uranium content noted in deposits of this type was 0.006 percent. The third type of deposit is represented on the Silver Pick property, where a gouge zone of differing thickness contains scattered flakes of torbernite. Five samples from this deposit contained from 0.00.5 to 0.013 percent uranium. The Grant View hot spring is moderately radioactive near the point where it issues from the hillside. Laboratory analysis of both water and sand from this deposit shows little uranium content (0.02 parts per million), and little radioactivity, indicating that the radioactivity is due to some short-lived daughter product, probably radon . The uraniferous material found to date in the area is of too low a grade and small a size to be of present value.

Nevada↗
USGS1951

Radon in the helium-bearing natural gas of the Texas panhandle

The known quantity of helium in the Texas Panhandle gas reservoir is greater than could be explained by assuming normal geologic conditions. Radon content of the gas varies between about 10 and 250 micromicrocuries per liter (S. T. P.), and the more highly radioactive wells are clustered in several groups. Mathematical analysis indicates that the larger concentrations of radon could not be derived from rocks of normal radioactivity.

Texas↗