From abstract: Eight tons of high grade pitchblende ore was sold from the Jo Reynolds mine near Lawson, Clear Creek County, Colo., in 1919. The pitchblende occurs with silver, lead, and zinc in carbonate-quartz veins cutting pre-Cambrian schist, granite gneiss, and granite.

From abstract: Pitchblende, associated with base-metal sulfides, has been found at eight localities in the northern part of Jefferson County, Colo., in shear zones that cut pre-Cambrian metamorphic and igneous rocks, chiefly hornblende gneiss, biotite schist, and granite pegmatite. The pitchblende deposits, with one exception, are in major shear zones that contain vein-like bodies of carbonate-rich breccia. The breccia bodies range from 1 to 5 feet in thickness and are related probably to the Laramide faults, or "breccia reefs" of similar trend, mapped by Lovering and Goddard (1950).

From abstract: Recorded production of pitchblende in the United States totals 313 tons of ore containing about 15 percent uranium. Of this total, 303 tons was produced at Central City and 8 tons at Lawson prior to World War I. The remaining 2 tons has been mined at Caribou during the past two years and is being stockpiled at the mine.

Report discussing the location, occurrence and chemical character of ground water in the Morrison formation near uranium-vanadium ore mineral deposits. Conclusions are included.

Report discussing a preliminary study of limonite sourced from nine localities of different types through Colorado, Utah and Wyoming, in the spring and fall of 1953. This study aimed to establish criteria for differentiating uranium- and thorium-related limonite and limonite not related to uranium or thorium. The report is divided by descriptions of each locality.

The following report describes samples of simplotite, a new calcium tetravanadite, that was discovered in five vanadium-uranium mines in the Colorado Plateau.

Report discussing a study on the Central City district and adjoining mining areas to determine the geology and economic importance of the uranium occurrences in the region.

Report discussing the use of an air concentrator on uraniferous sandstones for producing concentrates with over ten times the amount of uranium as original sandstone. A description of the concentrator, information regarding its operation, results of the concentration, information on the concentrator's applications, and a general summary are included.

From Introduction: "In the Uravan and Gateway districts, the general character of the bedding in the ore-bearing sandstone and amount of alteration in associated mudstones, and the relation of these to each other, are the features most useful as large-scale guides. This report describes these features and their distribution, as well as some other significant geologic characteristics of the ore-bearing sandstone."

From abstract: because of the increased demands for water in eastern Colorado, principally in the urbanizing Denver metropolitan area, increased diversions of water from Dillon Reservoir are planned. Estimates of end-of-month storage in Dillon Reservoir, assuming the reservoir was in place and 131,000 acre-feet of water were diverted from the reservoir each year, were reconstructed by mass balance for the 1931-77 water years. Based on the analysis, the annual maximum end-of-month drawdown below the elevation at full storage would have been 171 feet.

From introduction: Ground water is a source of municipal, domestic, stock, and irrigation water supply for most of northeastern Larimer County, Colorado. This report presents the results of a study made to determine the quantity, availability, and quality of the ground water. This information should be useful particularly for land-use planning and the utilization and protection of the ground-water resources.

A report discussing the occurrence and chemical character of ground water in the Morrison Formation in Southeastern Colorado and Southeastern Utah.

A report discussing two diamond-drill exploration projects in the Beaver Mesa Area

This report sumarizes the results of the US geological survey exploration in the Bull Canyon district from October 1955 to April 1956

A report regarding Preliminary reserve statement 21, reserve blocks A and B, Spud Patch area, San Miguel County, Colorado

A preliminary report discussing a diamond-drill exploration in the southern part of the Uravan District.

A report regarding a preliminary study of radioactive limonite localities in Colorado, Utah, and Wyoming. Concerns work done on behalf of the Division of Raw Materials of the U.S. Atomic energy Commission.

Preliminary report regarding diamond-drill exploration on Outlaw Mesa, Mesa County, Colorado. Done on behalf of the Division of Raw Materials of the U.S. Atomic Energy Commission

This preliminary report summarizes the exploration done in the Long Park area from March 1951 to mid-November 1951.

A report regarding Preliminary reserve statement 22, reserve block 7, Club Mesa, Montrose County, Colorado