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From abstract: This report presents the results of the geochemical reconnaissance sampling in the Winnemucca 10 x 20 quadrangle of the National Topographic Map Series (NTMS). We collected wet and dry sediment samples throughout the 18,770-km2 arid to semi-arid area and water samples at available streams, springs and wells. We present neutron activation analyses of uranium and trace elements and other measurements made in the field and laboratory in tabular hardcopy and microfiche format. The report includes 5 full-size overlays for use with the Winnemucca NTMS 1:250,000 quadrangle. Water sampling sites, water-sample uranium and thorium concentrations, sediment sampling sites, and sediment-sample total uranium and thorium concentrations are shown on the separate overlays. We present general geological and structural descriptions of the area, and describe the 12 known uranium occurrences.

Supplementary data containing information on uranium concentrations in sediment samples to accompany a report on hydrogeochemical and stream sediment reconnaissance in the Winnemucca Quadrangle, Nevada.

The following report is the first of two volumes describing the program and results of the airborne gamma and total magnetic field surveys of the Reno quadrangle conducted between October 4-November 10, 1977.