From abstract: Eight tons of high grade pitchblende ore was sold from the Jo Reynolds mine near Lawson, Clear Creek County, Colo., in 1919. The pitchblende occurs with silver, lead, and zinc in carbonate-quartz veins cutting pre-Cambrian schist, granite gneiss, and granite.

From abstract: The secondary uranium minerals autunite, metatorbernite, uranophane (?), and schroeckingerite occur in altered hornfels at the East Slope No. 2 uranium prospect. The deposit, in sec. 6, T. 27 S., R. 3 W., Piute County, Utah, is about I mile west of the Bullion Monarch mine in the central producing area of the Marysvale uranium district. Hornfels, formed by contact metamorphism of bullion Canyon volcanic rocks along the edge of a quartz monzonite stock, is in fault contact with the later Mount Belknap rhyolite.

From abstract: The Bulloch group of uranium claims are in T. 40 S., R. 9 we, Kane County, Utah. The past production has been 8.5 tons of submarginal ore submitted to the Marysvale purchasing depot of the Atomic Energy Commission in 1950; this shipment assayed 0.16 percent U308, Uranium is finely disseminated in clay, carbonaceous clay, carbonized wood fragments, iron-oxide concretions, petrified logs, sandstone, and conglomerates of the lower part of"the Dakota sandstone and upper part of the Summerville formation. Small quantities of carnotite, autunite, and torbernite are exposed in the conglomerate and sandstone on Lynn Nos. 2 and 3 claims.

From abstract: Recorded production of pitchblende in the United States totals 313 tons of ore containing about 15 percent uranium. Of this total, 303 tons was produced at Central City and 8 tons at Lawson prior to World War I. The remaining 2 tons has been mined at Caribou during the past two years and is being stockpiled at the mine.

Abstract: About 2,000 tons of low-grade lead ore has been produced from the Jim Kane mine, near Kingman, Mohave County, Ariz. A 3-foot vein of gouge and siderite stringers in pre-Cambrian gneiss contains some lead and, locally, is abnormally radioactive. A sample of the vein contained 0.067 percent uranium. Abnormal radioactivity is restricted to a small part of the vein, and no reserves are calculated.

From abstract: This report describes the new workings and proposes that additional exploration be undertaken on the Papsy's Hope No. 2 property in Marysville, Utah.

From abstract: The secondary uranium minerals metatorbernite (?) and autunite (?) were discovered at Indian Creek in the spring of 1950. The deposits, in sec. 28, T. 27 S., R. 6 W., Beaver County, Utah, are 20 miles west of Marysvale, and about three-eighths of a mile east of a quartz monzonite stock.

Abstract: Radioactive zones are present in the upper silty part of the pre-Cambrian Dripping Spring quartzite at the Red Bluff prospect, Gila County, Ariz. The prospect is in the SE 1/4 sec. 31, T. 5 N., R. 14 E., at the southern end of the Sierra Ancha area and 12 miles northeast of Roosevelt Dam. Stratigraphic control of the radioactive zones is indicated by the restriction of the zones to two layers, each about 20 feet thick.The zones are spatially associated in part with a diabase dike that occupies a fault, and in part with a thick diabase sill. The main uranium mineral disseminated through the rock in these zones has not been identified definitely, although minor quantities of secondary uranium minerals were observed. The results of scintillometer traverses and radiometric analyses indicate that the deposits probably contain an average of 0.026 percent uranium. Some black streaks and some fractures contain a higher percentage of uranium, but so far as is known the volume of such material is probably too small to affect the overall grade of the deposits.

From abstract: The Thomas Range fluorite district, on Spor's Mountain in the western part of the Thomas Range, Juab County, Utah, is approximately 6 miles long and 2 miles wide, and contains almost no unclaimed land. The fluorite production of the district, since its discovery in 1943, has been 35,700 short tons. It was obtained from 12 different ore bodies on eight different properties. G. P. Spor, Ray Spor, and Chad Spor; Albert Willden and Earl Willden; T. A. Claridge; and W. E. Black and F. B. Chesley were the only groups producing fluorite in the district in August 1950.

From abstract: Investigations of the land-pebble phosphate deposits of Florida by the Geological Survey began in November 1947. This report presents the computation of reserves of phosphate rock in the northern part of the district.

From introduction: "This report summarizes the research work of the Trace Elements Section, Geochemistry and Petrology Branch, from the organization of the Section in April 1948 to December 31, 1950." Investigation of radioactive materials and investigation of methods for analysis of radioactive materials is included.

The following report discusses radioactive results found in 4 samples of gneissic granite of 13 samples collected from the Mount Michelson area of northeastern Alaska. A mineralogic study of all heavy-mineral fractions having more than 0.01 percent equivalent uranium indicates that the radioactive material apparently is confined to biotite, which in one sample contains 1.19 percent uranium.

The following report presents results of radiometric and mineralogic studies made on 13 samples taken from the Mount Michelson area, Alaska.

A report regarding uranium resources in the Silver Reef district, in Washington County, Utah.