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.

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.