Abstract: Two uranium-bearing minerals, uranothorianite and thorite (?), were found in the stream gravels of the main branch of the South Fork of Quartz Creek, a tributary of the Kiwalik River. Although the bedrock source of the minerals was not located, the radioactive material was traced in slope wash well above the stream gravel. A detailed investigation of the area with more sensitive counters might reveal the source of the minerals and localities where the minerals are sufficiently concentrated to be minable.

Report discussing progress made on geologic studies under the Colorado Plateau Project. The geologic studies that were in progress during the time of this report consist of the following: "(1) General geologic mapping in southwestern Colorado and southeastern Utah. (2) Regional stratigraphic and sedimentary studies in Colorado, New Mexico, Utah, and Arizona. (3) Studies of past and present ground-water conditions in southwestern Colorado and southeastern Utah."

Report presenting abstracts and major findings from physiological, biochemical, soil chemical, geological, and mineral studies of the apatite group of minerals.

Report discussing the characteristics and locations of radioactive carbonaceous and bituminous shales in the United States.

Abstract: The Model R fluorimeter has been modified to increase its stability and sensitivity. The new instrument is about ten times as sensitive as the original fluorimeter, but it can also be employed conveniently at a sensitivity level comparable to or less than that of the Model R fluorimeter.

Report discussing properties and uses of beryllium and beryl, an ore of beryllium produced as a by-product of mining in Colorado.

From abstract: "A study was made of the important factors in the 'direct' fluorimetric determination of uranium in the range 0.0005 to 0.08 micrograms of uranium, and a modified procedure based on these results is given."

Abstract: An early report on the Cape Nome area, Seward Peninsula, Alaska, stated that granitic rocks there contain allanite as a common accessory mineral. Results of studies in 1947 indicate that very little allanite is present, and that the slight amount of radioactiity of the granitic complex is attributable to the accessory minerals zircon and sphene.

Report discussing an exploratory drilling program in the Charles T. area and vicinity during the period from November 1947 and September 1949. "The purpose of the exploration was to discover new carnotite deposits to support milling operations on the Colorado Plateau, and to appraise the uranium and vanadium resources of the area explored."

From abstract: "A method is described whereby aluminum in phosphate rock is determined by the fluorescence of aluminum hydroxyquinolate in chloroform solution."

Report discussing a geological study of the Chattanooga Shale of the Eastern Highland Rim area of Tennessee in 1947, 1948, and 1949 to determine its availability as a source of uranium.

From Abstract: "Four methods of dating Colorado Plateau carnotite have been examined and evaluated: mineralogic methods, radioactive-equilibrium methods, lead-uranium-ratio methods, and lead-isotope methods. The data on 12 high-grade samples, from a suite of 50 representative carnotite ores, are presented."

Report discussing a geological experiment in which 48 drill holes in the Calamity area were logged with the objective to check the results obtained in a previously done experiment by the Schlumberger Well Surveying Corporation.

From Introduction: "This catalog is a list of specimens of radioactive minerals for which the Geological Survey has been collecting optical, X-ray diffraction, and other data."

From Abstract: "A short routine direct fluorimetric procedure for the determination of up to 0.06 percent uranium in phosphate rocks is described."

The following report summarizes the results of a brief geological examination made by the Geological Survey of the small uranium deposit in the Majuba Hill mine, Pershing County, Nevada.

A report about seven rock samples collected by a U.S. Geological Survey geologist in the Russian Mountains in 1944 which have proved to be somewhat radioactive.

From Abstract: "A transmission fluorimeter for the measurement of the fluorescence of uranium in fluoride melts is described...Detailed shop drawings are given for the construction of the fluorimeter."

Report discussing the geochemistry of gadolinium, specifically the abundance of the element and its isotopes in the earth's crust.

Abstract: Secondary minerals of the uranite group occur in dense quartz veins and in altered aplitic granite along and near the crest of the east-trending ridge about one mile west of Clancy, Montana. Brief examination suggests that the radioactive minerals are erratically distributed, but a more thorough study of the area will be made by the Geological Survey during the coming field season.

Glossary of minerals containing uranium and thorium. "In the index there are 325 entries which represent 81 species containing uranium and thorium as major constituents, 39 species containing small amounts of uranium and thorium, 29 species which should be tested for uranium and thorium, and 13 species which have been reported to contain impurities or intergrowths of uranium, thorium, or rare-earth minerals."

Abstract: Some modifications of current techniques for preparing nuclear plates for mineralogical studies are described. A method of mounting nuclear-track stripping film on thin sections is given. Illustrations are presented of the application of these techniques to the study of the radioactivity of powdered rocks, minerals, or thin sections.

Abstract: "Two uranium-bearing minerals, uranothorianite and thorite(?), were found in the stream gravels of the main branch of the South Fork of Quartz Creek, a tributary of the Kiwalik River. Although the bedrock source of the minerals was not located, the radioactive material was traced in slope wash well above the stream gravel. A detailed investigation of the area with more sensitive counters might reveal the source of the minerals and localities where the minerals are sufficiently concentrated to be minable."

Report discussing elements that may be by-products of mining or processing phosphate rock. "Many of these elements are of interest because they are essential, if only in small quantities, to plant growth. Others are of concern because they must be removed from the phosphate rock before some of the chemical products manufactured from it can be utilized without deleterious effects."