A preliminary report regarding the Comet Area, in the Jefferson City Quadrangle Jefferson County, Montana. This report contains work done on behalf of the Division of Raw Materials of the U. S. Atomic Energy Commission.

A report regarding the geology and mineralogy of the W. Wilson. Mine near Clancey, Jefferson County, Montana. This report concerns work done on behalf of the division of Raw Materials of the U.S. Atomic Energy Commission.

A preliminary report on the geology of the phosphate deposits located in the Centennial Range in Montana and Idaho.

Discussing uranium in carbonaceous rocks in the Townsend and Helena Valleys, Montana

Report discussing an investigation of the stratigraphy of the Phosphoria formation in Montana. The investigation took from 1949 to 1950, and this report includes about half of the data collected. Analytical data and abstracts of several locations' stratigraphic sections are included.

Report discussing the U.S. Geological Survey's investigation of the stratigraphy of the Phosphoria formation in Montana. Abstracts of stratigraphic sections and analytical data is included.

Report discussing the results of geological studies that have been conducted in the Clancy Creek in the Jefferson City Quadrangle of Jefferson County, Montana. The location is of interest due to the discovery of several radioactivity anomalies and secondary uranium minerals in the area.

Report discussing the U.S. Geological Survey's investigation of the stratigraphy of the Phosphoria formation in Montana. This contains the second half of data collected during the investigation, which took place from 1949 to 1950.

A report about the Lemhi Pass area in the Beaverhead Mountains, Lemhi County, Idaho, and Beaverhead County, Montana, which was undertaken to determine the area as a potential source of thorium.

A report about uranium bearing lignite beds which are 1.5 to 8 feet thick that occur in the Fort Union formation of the southern part of the Ekalaka Hills, Carter County, Montana.

Report discussing a geological study performed to find uraniferous lignites in North Dakota, Eastern Montana, north-central Wyoming, and northwestern South Dakota. "Deposits of uraniferous lignites were discovered at Blue Buttes, eastern Montana; and at North Cave Hills, South Cave Hills, and at Slim Buttes in northwestern South Dakota."

Report presenting data from part of a study aimed at analyzing and mapping out stratigraphic sections of the Phosphoria formation in southwestern Montana.

Report presenting new data on the age of the Boulder, Philipsburg, and Idaho batholiths of western Montana.

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.

Report discussing uranium occurrences in carbonaceous shale and lignite beds in areas of the Townsend and Helena Valleys in Montana.

Report discussing an investigation of the Centennial Range of Montana and Idaho, and the phosphate deposits of this area. Information on the geology of the area and deposits are given as well as information regarding the quality and location of phosphate deposits.

Report discussing a radiometric examination that took place in 1950 to determine the grade, reserves, and mode of occurrence of uranium and thorium in east-central Idaho and south-western Montana.

Report describing the geology and structural features of the Comet area of Jefferson County, Montana.

Report describing the phosphorite deposits of the western United States with the objective of outlining features that are common to both the Kara Tau phosphorite deposits of Russia and the western United States deposits in an effort to define their origin.

Report discussing investigation of the relation of uranium and phosphate in the Phosphoria formation and its close stratigraphic equivalents.

From abstract: A reconnaissance for sources of radioactive material in North Dakota and eastern Montana was made in 1948. This reconnaissance was followed by a more detailed survey of parts of Golden Valley and Slope counties, southwestern North Dakota, in June 1949. The radioactivity of representative sections of all formations known to be exposed in the area and of three manganiferous spring deposits was determined with portable Geiger-Mueller counters. At 86 localities 82 samples were taken of these formations and also of 10 ground and surface waters.

From abstract: Approximately fifty radioactive deposits and nearly fifty properties not abnormally radioactive were examined during a geologic reconnaissance for radioactive minerals in Idaho, Washington, and western Montana during the period July 1952 -- June 1955. The most important uranium deposits are in or near granitic to quartz monzonitic intrusions of probable Cretaceous age in central and northern Idaho, westernmost Montana, and northeastern Washington.

Abstract: A number of radioactivity anomalies and secondary uranium minerals have been found in the Rimini area near the northwestern margin of the Boulder batholith. Most of the anomalies are associated with chalcedonic vein zones that consist of one or more veins of cryptocrystalline and fine-grained quartz in silicified quartz monzonite and alaskite. Seventeen of the anomalies were found along veins that contain base and precious metals; nine were along veins in the vicinity of the village of Rimini from which there has been production of lead, silver, zinc, and gold.

From introduction: This report details the reconnaissance for uraniferous lignites in North Dakota, South Dakota, Montana, and Wyoming during 1948 and 1949.