Report issued by the Bureau of Mines over tungsten deposits of Arizona. Characteristics of the tungsten deposits are discussed. This report includes tables, maps, and illustrations.

From abstract: During part of February and March 1953, reconnaissance examinations for radioactive material were made at 12 localities in the Yuma Air Force Base gunnery range in southern Yuma County, Ariz. The Yuma gunnery range, which is adjacent to the west edge of the Luke and Williams Air Force Bases gunnery range, is characterized by block faulted, elongate mountain ranges composed essentially of schist, gneiss, and granite of pre-Cambrian to Mesozoic age and separated by broad alluvial basins.

Summary and conclusion: More than 4000 feet of Lower Miocene lake sediments were deposited upon a gneissic basement rock, at least locally. The sediments have been gently folded into broad anticlines and synclines and have been cut by high-angle faults with displacements on the order of 100 feet. Both basaltic (?) and acid andesitic lavas have intruded the sediments. A Pleistocene (?) conglomerate unconformably overlies all older exposed rocks. The lake sediments were considered to overlie the adjacent thick series of andesite flows (l). This was not established by a cursory examination. The sediments appeared to be in fault contact with the lavas although the relationship was always obscured by the younger conglomerate or alluvial cover. Since a dike of this acid andesitic composition was observed cutting the sediments, there is a possibility that the lake sediments are older than or contemporaneous with the thick extrusive andesite series.

From introduction: This report is written in response to a request from the Army Engineers for an appraisal of the uranium potential of the area included in the Yams Test Station. the area of Proposed Expansion of the Yuma Test Station, and the Williams Bombing and Gunnery Range. Only the area covered by the present Yuma Test Station is included here. The other areas will be discussed In subsequent reports.

Report describing the results of an orientation study to determine uranium concentrations within the Artillery Peak and Prescott quadrangles in Arizona. It includes concentrations of uranium and 25 other elements based on analysis of wet, dry, and rock samples taken in the area.

From abstract: This drilling project in northwestern Arizona consisted of 18 holes drilled to depths ranging from 1,341 to 5,491 feet (409 to 1,673 meters). The holes were sited to determine the lateral extent of the uranium-bearing, paludal/lacustrine strata of the Anderson Mine in Date Creek basin and to obtain additional data to improve the resource estimates for the Date Creek and Big Sandy basins.

From summary: The objective of the project was to obtain subsurface data that would permit a more accurate estimate to be made of the uranium potential in the Tertiary basins within the project area.

Report describing the results of a program to test and evaluate the cross-country mobility of the Overland Train (a logistical cargo carrier) in a desert environment. This study used a system for terrain classification developed by the U.S Engineer Waterways Experiment Station as part of the tests made on various courses at the U.S. Army Yuma Proving Ground in Arizona.

"The purpose of this report is to present the results of an inspection performed at Laguna Army Airfield (LAAF), Yuma Proving Ground, Arizona, during December 1972. The inspection was limited to visual observations, and no tests were conducted on any of the pavement facilities. A layout of the airfield is shown in plate 1" (p. 1).

Supplementary data containing geophysical logs to accompany a geologic report on drilling in the Western Prescott and Williams Quadrangles.

Supplementary data containing sediment analyses of sediment samples for uranium and thorium concentrations in the Artillery Peak Quadrangle to accompany a report on U.S. uranium resources in Mohave County, Arizona.

Supplementary data containing geophysical drilling logs to accompany an engineering report on drilling in the Western Prescott and Williams Quadrangles, Arizona.

Purpose and scope: The purpose of this study was to develop a method for estimating the amount of subsurface return flow to the Colorado River in the Yuma area. This report presents a method that will permit an accounting of ground-water return flows from each side of the Colorado River in the Yuma reach. The estimates of return flow can be used by water-management agencies in determining return-flow credits for the States of Arizona and California.

Purpose and scope: The purpose of this study was to develop a method for estimating the amount of subsurface return flow to the Colorado River in the Yuma area. This report presents a method that permits an approximate accounting of ground-water return flow from each side of the Colorado River in Yuma reach. The method presented in this report was developed specifically for application in the Yuma area. The validity of the assumptions inherent in the method was evaluated on the basis of the local hydrologic system. The applicability of the method to other hydrologic systems is not addressed in this report.

Report studying the use of desalinated water for irrigation at three locations in Arizona and California. Costs and benefits are measured among several different areas, including multiple concentrations of desalinated water, different desalting methods, and the desalting process.