Report of investigations issued by the U.S. Bureau of Mines on the estimated recoverable reserves of bituminous coal found in the Matanuska Valley Coal Field. The investigation includes studies of the area, and methods of mining which include diamond and churn drilling. This report includes maps, photographs, and illustrations.

From introduction: Since 1945 the Alaskan Trace Elements Unit of the U. S. Geological. Survey has been engaged in reconnaissance for radioactive deposits in Alaska, first on behalf of the Manhattan Engineer District, later on behalf of the Atomic Energy Commission. During the period January 1945 through December 1952, 42 reports in the Survey's Trace Elements Investigations series and 18 reports in the Trace Elements Memorandum series, a totaJ of 60 reports, have been completed or are in preparation Of these 60 reports 44 have been completed and transmitted to the Commission as of December 31, 1952.

The following report presents the data retrieved, a description of the equipment and methods used, and comments based on preliminary interpretations of the results from a radioactive survey taken in the Dixon Entrance Quadrangle in southeast Alaska.

First volume of a final report documenting the results of an airborne radiometric and magnetic survey in a portion of Alaska, including a description of the survey methods, calibration of the systems, data processing and displays, and interpretation methods.

Second volume of a final report documenting the results of an airborne radiometric and magnetic survey, including data displays and interpretation results for the Unalakleet quadrangle.

Second volume of a final report documenting the results of an airborne radiometric and magnetic survey, including data displays and interpretation results for the Nulato quadrangle.

A report regarding an airborne gamma-ray spectrometer and magnetometer survey of the Meade River Quadrangle, Alaska.

A report regarding an airborne gamma-ray spectrometer and magnetometer survey of the Harrison Bay Quadrangle, Alaska

A report regarding an airborne gamma-ray spectrometer and magnetometer survey of the Beechy Pt. Quadrangle Alaska.

A report regarding an airborne gamma-ray spectrometer and magnetometer survey of the Point Lay Quadrangle, Alaska.

A report regarding an airborne gamma-ray spectrometer and magnetometer survey of the Lookout Ridge Quadrangle, Alaska

A report regarding an airborne gamma-ray spectrometer and magnetometer survey of the Ikpikpuk River Quadrangle, Alaska.

Report issued by the Bureau of Mines over studies conducted on the beneficiation of iron-copper ores. As stated in the summary, "this report summarizes the results of laboratory testing of copper-bearing magnetite ore from the Poorman, Rush and Brown, and Copper Center deposits, Kasaan Peninsula, Prince of Wales Island, southeastern Alaska" (p. 1). This report includes tables, maps, and illustrations.

Abstract: A suite of 50 rock specimens, collected by the 1947 Washburn Mount McKinley Expedition, was scanned radiometrically. The maximum radioactivity observed in any one of the specimens was about twice background. Radiometric analyses of the most radioactive samples show that a sample of vein quartz coated with manganese oxide contains 0.009 percent equivalent uranium and that the maximum equivalent uranium content of granitic rock types is .004 percent. The radioactivity of the manganese-stained quartz is probably due to traces of uranium in the manganese mineral, whereas that of the granitic rocks is due to radioactive accessory minerals.

Report discussing the uranium-containing radioactive granite of the Miller House-Circle Hot Springs area of east-central Alaska.

The following report provides results taken from more than 600 samples found in Alaska, mostly concentrates from placer operations, that were tested for radioactivity during January 1945 in the laboratory of the Geological Survey.

Report discussing a study in which a suite of 50 rock specimens collected by the 1947 Washburn Mount McKinley Expedition was scanned radiometrically.

Report discussing a 1949 geological examination for radioactive deposits in the Nixon Fork mining district of Medfra quadrangle, central Alaska.

Report discussing the investigation of radioactive deposits in granite and search for bedrock source of radioactive materials in the Ruby-Poorman district of Alaska during July 1949.

Report discussing an investigation of radioactivity occurrences, mostly caused by thorium in thorite and monazite, in various parts of southeastern Alaska. The geology and structural qualities of these radioactive areas are discussed.

Abstract: "The highest radioactivity value obtained in a traverse of shales in the Middle Paleozoic section of the lower Coleen River is 0.003 percent equivalent uranium. Traverses on pre-Cambrian schists at Rabbit Mountain were made with negative results."

Geological maps of Alaska showing uranium and other elements concentrations.

First volume of a final report documenting the results of an airborne radiometric and magnetic survey in a portion of Alaska, including a description of the survey methods, calibration of the systems, data processing and displays, and interpretation methods.

From addendum: Two types of analyses for uranium in the stream-sediment samples are presented. One split of the stream-sediment samples was sent to Resource Associates of Alaska's laboratory, where they were analyzed for U by the fluormetric method after acid extraction. This is the method employed for U by most laboratories. The completeness of uranium extraction unavoidably varies with the particular type of uranium-bearing minerals present and possibly with the amount of iron, manganese, and carbonaceous material present, which can interfere with the extraction. Analyses by the method are shown in the text and appendix columns with the designation "RAA."