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.

This is the second volume presenting aerial gamma ray and magnetic survey data from the Denver quadrangle. This report contains data profiles, anomaly maps, flight path recovery map, and sample data.

This is the second volume presenting aerial gamma ray and magnetic survey data from the Pueblo quadrangle. This report contains data profiles, anomaly maps, flight path recovery map, and sample data.

"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)

Output of package SURE (a System for Uranium Resource Evaluation) applied to the Durango quadrangle.

Output of package SURE (a System for Uranium Resource Evaluation) applied to the Montrose quadrangle.

Output of package SURE (a System for Uranium Resource Evaluation) applied to the Pueblo quadrangle.

Output of package SURE (a System for Uranium Resource Evaluation) applied to the Trinidad quadrangle.

A report with the purpose of developing a practical system for quantitatively assessing the uranium resources in individual quadrangles based upon the HSSR data and tonnage/grade data for occurrences.

"Results of a reconnaissance geochemical survey of the Scottsbluff Quadrangle are reported. Field and laboratory data are presented for 567 groundwater and 402 stream sediment samples. statistical distributions and symbol plots for uranium and possible uranium-related variables are enclosed. A generalized geologic map and a producing horizon map for the survey area are provided. Pertinent geologic factors that may be of significance in evaluating the potential for uranium mineralization are briefly discussed."

Documentation outlining characteristics of field data samples taken in the Scottsbluff quadrangle.

Documentation outlining characteristics of field data samples taken in the Scottsbluff quadrangle.

Data gathered at stream sediment sites in the Scottsbluff quadrangle, including applicable water chemistry measurements (e.g., pH, conductivity, alkalinity) and elemental analyses.

Data gathered at well water sites in the Scottsbluff quadrangle, including applicable water chemistry measurements (e.g., pH, conductivity, alkalinity), physical measurements (e.g., temperature, well description, scintillometer readings), and elemental analyses.

The following appendix contains petrographic photomicrographs of uranium anomalies in Waterloo Gulch, Colorado.