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At least 289 records · Page 16Linked to original sources
USGS1953

Montroseite, a new vanadium oxide from the Colorado plateaus

Montroseite, a new vanadium mineral named from Montrose County, Colorado, has been found in four mines in western Colorado and in two mines in eastern Utah. It is black, opaque, submetallic, and occurs in microscopic bladed crystals of the orthorhombic dipyramidal class. The axial ratio is a:b:c = 0.509:1:0.310, the common forms are b {010}, m {110}, p {121}, and a large vicinal form is approximately {0, 10, 1}. The observed specific gravity is 4.0 and the calculated specific gravity is 4.15. The composition is essentially VO(OH), with some iron commonly substituted for vanadium. Partial oxidation to VO 2 has taken place. Chemical analyses and X-ray diffraction data are given. Single crystal study indicated that the space group symmetry is Pbnm(D 2h 16 ).

Colorado;Utah↗
USGS1953

Reconnaissance during 1952 for uranium-bearing carbonaceous rocks in parts of Colorado, Utah, Idaho, and Wyoming

A reconnaissance for uranium-bearing carbonaceous rocks was made during the 1952 field season in 23 areas in Colorado, Utah, Idaho, and Wyoming. Uranium in small amounts occurs in several of the areas examined, but no deposits were found that might have commercial possibilities. As much as 0.03 percent uranium is in the ash of coal in the Caribou Mountain area in southwestern Idaho; 0.012 percent in the ash of coal in the Burnt Fork area of southwestern Wyoming; and 0.009 percent in the ash of coal from near Driggs in eastern Idaho. Seven additional areas were examined in which beds of coal or carbonaceous shale contained more than 0.002 but less than 0.007 percent uranium in the ash. Unweathered samples of bituminous sandstone from the Vernal area, Utah, contain minor quantities of uranium. ilities.

Colorado;Idaho;Utah;Wyoming↗
USGS1953

Uranium-bearing carbonaceous shale and lignite in the Goose Creek district, Cassia County, Idaho, Boxelder County, Utah and Elko County, Nevada

The Goose Creek district includes about 260 miles in southern Cassia County, Idaho, and adjacent parts of Boxelder County, Utah, and Elko County Nev. The-area comprises the northern and central parts of an intermontane basin drained by northward-flowing Goose Creek and its tributaries. An essentially conformable sequence of fluviatile, lacustrine, and pyroclastic sediments of late Miocene (?) and early Pliocene age make up most of the rocks exposed in the district. These rocks include the Payette formation and the overlying, Salt Lake formation. They unconformably overlie a sequence of limestone, quartzite, and shale Carboniferous and older in age, exposed in the mountains to the west and northeast; and a thick body of rhyolite of Tertiary (?) age exposed in the mountains to the southeast. Surficial deposits of silt, sand, and gravel locally overlie the older rocks. The Payette and Salt Lake formations have a general easterly dip of 4 to 12 degrees, modified locally by shallow folds. Many normal faults, some with displacement several hundred feet, cut the Tertiary strata at various places in the district.

Idaho, Nevada, Utah↗
USGS1954

Localization of uranium minerals in channel sediments at the base of the Shinarump conglomerate, Monument Valley, Arizona

During the summers of 1951 and 1952 the U.S. Geological Survey mapped the geology and uranium deposits in three 15-minute quadrangles on the Navajo Indian Reservation in Apache and Navajo Counties, northeastern Arizona. Exposed sedimentary rocks range in age from the Halgaito tongue of the Cutler formation (Permian) to the Salt Wash member of the Morrison formation (Jurassic), The dominant structural element of the area is the Monument upwarp, a arge asymmetrical anticline whose northern end is near the junction of the Green and Colorado Rivers in Utah, and whose southern end disappears near Kayenta, Ariz. Asymmetrical anticlines with steeply dipping east flanks and gently dipping west flanks are superimposed on the upwarp. These subsidiary structures trend north. The uranium ore bodies are localized in conglomeratic sandstone of the Upper Triassic Shinarump conglomerate that fills channels scoured in the underlying Lower and Middle (?) Triassic Moenkopi formation. These channels range from relatively narrow and shallow ones 15 feet wide and 10 feet deep to much broader and deeper ones 2,300 feet wide and 70 feet deep. Two types of channels can be distinguished-r-a short-type less than 2 miles Iong 5 and a long-type traceable for distances greater than 2 miles Plant matter in the form of trees, branches,'and twigs was deposited with Shinarump sediments in the channels. It is suggested that when the Shinarump conglomerate was invaded by mineralizing solutions the uranium ore was deposited primarily in localities formerly occupied by the plant material. Further, it is suggested that the short channels are more likely to have ore accumulations than long channels.

Arizona↗