Color copies of photomicrograph figures that accompany a report studying uranium in granites in the southwestern United States.

First volume of a final report documenting the results of an airborne radiometric and magnetic survey in a portion of Colorado and Utah, 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 Cortez quadrangle.

"This report consists of engineering details, statistics, individual borehole histories, and logistics for the 27 boreholes drilled in the project. Geophysical logs are included." (from Introduction)

"This report consists of engineering details, statistics, and logistics of the 19 boreholes drilled in the project. Geophysical logs are included on microfiche in the back of this report." (from Introduction)

Final report documenting a survey of the Durango quadrangle in Colorado as part of the Platoro Caldera detail survey. This volume outlines survey and analysis methods, and summarizes results.

From 1995 sites in the San Juan Mountains area, 1706 water and 1982 sediment samples were collected during June-July 1976 and analyzed for uranium. The area includes the southern third of the Colorado mineral belt which has yielded rich ores of gold, silver, copper, lead, zinc, and molybdenum. The broadly domed mountains are capped by 2500 m of Tertiary volcanics, deeply eroded to expose a Precambrian crystalline core. Adjacent plateaus underlain by Mesozoic sedimentary rocks were included in the reconnaissance. Average value of uranium in water samples from mountains was less than 0.5 parts per billion, from plateaus was 1-2 parts per billion, from Mancos shale areas exceeded 2 parts per billion. Anomalous sediment samples, 40 ppm uranium, came from near Storm King Mountain and upper Vallecito Creek. Other anomalous areas, including the Lake City mining district, were well defined by 4-30 parts per million uranium in sediment and 3-30 parts per billion uranium in water. Anomalous areas not previously reported indicate favorable areas for future exploration.

From abstract: This two-part report provides an essentially complete listing of radioactive occurrences in Colorado, with a comprehensive bibliography and bibliographic cross-indexes.

Rock and stream-sediment samples were collected to define areas favorable for uranium deposits northeast of Gunnison, Colorado. Areas considered most favorable for further exploration are: (1) the Bronco Mountain area, approximately 10 mi south of Taylor Park Reservoir, (2) the area near the Big Red mine, and (3) the area 5 mi north-northeast of Taylor Park Reservoir. On the basis of known deposits in the Marshall Pass and Cochetopa districts, fault contacts between Precambrian granites and Paleozoic or Mesozoic sedimentary rocks are favorable structural sites.

This report is a preliminary evaluation of the uranium resources of the Brushy Basin Member of the Morrison Formation of Late Jurassic age in southwestern Colorado and southeastern Utah. The project, which began July 1, 1976, and was completed October 1, 1976, was carried out by the Bendix Field Engineering Corporation (BFEC) for the Grand Junction Office of the U.S. Energy Research and Development Administration (ERDA).

From purpose of study: The Vallecito Conglomerate of the Needle Mountains area in southwestern Colorado was studied to evaluate the uranium potential of the unit and to test the applicability of the uraniferous Precambrian pebble-conglomerate exploration model in this area. The main thrust of this project is the Vallecito Conglomerate, but the Uncompahgre Formation, which is also in the Needle Mountains area has basal conglomerate that was investigated in a reconnaissance mode. Five specific objectives have been formulated to meet the overall purpose of this project, and these include: a) Determine the uranium distribution in the Vallecito Conglomerate and the basal conglomerate of the Uncompahgre Formation. b) Evaluate the uranium resources of the area to the degree possible utilizing available information and personal field investigations. c) Test the validity of application of the Precambrian quartz-pebble conglomerate model to this area. d) Recommend detailed studies and delineate drilling sites in the area to further evaluate the uranium resources if warranted. e) Recommend additional geologic, geophysical and geochemical studies which would bear directly on evaluation of uranium resources of the Precambrian pebble conglomerates in the Needle Mountains area.

From introduction: This study is part of the United States Department of Energy's National Uranium Resource Evaluation Program to understand the geologic setting, amount, and availability of uranium resources within the boundaries of the United States.

The following report describes the study of sediment in South Park, Colorado, the study taking 464 water samples to test for uranium in the Rocky Mountains.

A report discussing data collected during a detailed geochemiccal survey for uranium in streams draining parts of the Browns Park and North Park formations, in Craig, Colorado

Multivariate statistical analysis to support the National Uranium Resource Evaluation and to evaluate strategic and other commercially important mineral resources

This report provides uranium and other elemental data resulting from the Hydrogeochemical and Stream Sediment Reconnaissance (HSSR) of the Cortez quadrangle, Colorado/Utah.

Final report documenting a high-sensitivity airborne gamma radiation and magnetic field survey of the Limon National Topographic Map segment (NJ 13-3 quadrangle) including a description of the program and results with the flight line profile data and statistical analysis results.

Final report regarding the National Logging Program for the National Uranium Resource Evaluation

"The purpose of this project was to evaluate and assess the Miocene Browns Park Formation of a part of the Maybell district in the Sand Wash Basin in Moffat County, Colorado, as an intermediate-grade uranium resource"

Final report of the airborne gamma ray and total magnetic field survey for the Grand Junction quadrangle, Colorado-Utah. Sections I through IV of this report present information and results associated with this specific survey. Section V gives the data acquisition and the processing procedures.

"This report is an analysis of the various types of uranium occurrences in the Colorado Front Range and the environments in which they developed." (from Abstract)

Report documenting the results of chemical analysis for 422 water and 1552 sediment samples in the Vernal quadrangle, Utah/Colorado. It includes an overview of the area, methods, data analysis, and evaluation.

Supplementary data containing locations of uranium deposits in the Brushy Basin project area, Utah and Colorado.

Average record data listings taken during aerial gamma-ray and magnetic surveys of the Cortez quadrangle in Colorado and Utah.