Abstract: Steamboat Springs is a presently active equivalent of epithermal gold-silver ore-forming systems. Hot-spring sinter deposits contain small amounts of gold, silver, mercury, antimony, and arsenic. Hot-spring activity probably started before extrusion of the basaltic andesite of Steamboat Springs. Old sinter from the Steamboat Springs system occurs in gravels above and below the basaltic andesite. Intense hydrothermal alteration, including almost complete replacement by hydrothermal potassium-feldspar, has affected the basaltic andesite. Three plagioclase separates of differing potassium content from fresh basaltic andesite yielded potassium-argon ages of 2.52 to 2.55 m.y. Basaltic andesite almost completely replaced by potassium-feldspar yielded an age of 1.1 m.y. The source of energy for the thermal convection system is probably a large rhyolitic magma chamber that supplied the pumice and from which the rhyolite domes were emplaced. Sanidine and obsidian from four of the rhyolite domes yielded potassium-argon ages of 1.15 to 1.52 m.y. and obsidian from one of the northeastern domes yielded apparent ages of 2.97 and 3.03 m.y. The data indicate that hydrothermal activity has occurred at Steamboat Springs, possibly intermittently, for more than 2-1/2 m.y. These data agree with other radiogenic age studies indicating 1- and 2-m.y. lifetimes for the hydrothermal systems that generate …

"This report represents the results of the reconnaissance sampling of the Deep Creek Mountains of western Utah...Samples collected in this study include dry and wet stream sediments and water from available streams, wells, and springs. The samples were analyzed for uranium, as well as 15 to 20 trace element, using neutron activation techniques. In addition, field and laboratory measurements were made on the water samples." (from Abstract)

Map presenting an aerial radiometric and magnetic survey of Winnemucca, Nevada.

This is a airborne reconnaissance report of the Williams Quadrangle in Arizona.

Abstract: The results of analyses of the airborne gamma radiation and total magnetic field survey flown for the region identified as the Tonopah National Topographic Map NJll-5 is presented in Volume I and II of this report. The airborne data gathered is reduced by ground computer facilities to yield profile plots of the basic uranium, thorium and potassium equivalent gamma radiation intensities, ratios of these intensities, aircraft altitude above the earth's surface, total gamma ray and earth's magnetic field intensity, correlated as a function of geologic units. The distribution of data within each geologic unit, for all surveyed map lines and tie lines, has been calculated and is included. Two sets of profiled data for each line are included with one set displaying the above-cited data. The second set includes only flight line magnetic field, temperature, pressure, altitude data plus magnetic field data as measured at a base station. A general description of the area, including descriptions of the various geologic units and the corresponding airborne data, is included also.

This is a report on the aerial radiometric and magnetic survey, Tonopah National topographic map, Nevada.

This is an airborne reconnaissance report on several quadrangles in Arizona, California, and Nevada.

The following report presents the results of the geochemical reconnaissance sampling in the Lovelock quadrangle, Nevada.

Single record and averaged record data listings for the Las Vegas quadrangle in California, Nevada, and Arizona taken during a reconnaissance survey.

The following report summarizes the investigations made following the Mighty Epic event beneath the surface of Rainier Mesa in U12n.10 tunnel at the Nevada Test Site.

This is Volume II of the Goldfield National Topographic Map series (NTMS). This volume contains the flight line profile data and statistical analysis results.

This is Volume I of two for the Vya NTMS report. This volume describes the program and results.

This is Volume II of the Wells NTMS. This volume contains the flight line profile data and statistical analysis results.

The following report is the second volume in a series of reports documenting airborne gamma-ray spectrometer and magnetometer survey results. The data on this report focuses on the Las Vegas quadrangle.

This is Volume II of the Vya NTMS. This volume contains the flight line profile data and statistical analysis results.

From abstract: "The results of analyses of the airborne gamma radiation and total magnetic field survey flown for the region identified as the Wells National Topographic Map NK11-9 is presented in Volume I and II of this report."

The following report is the second volume in a series of reports documenting airborne gamma-ray spectrometer and magnetometer survey results. The data on this report focuses on the Kingman quadrangle.

"The results of analyses of the airborne gamma radiation and total magnetic field survey flown for the region identified as the Millet National Topographic Map NJ11-2 is presented in this report." (from abstract)

The following report documents the results of the airborne gamma radiation and total magnetic field survey flown for the Elko quadrangle between Nevada and Utah in 1979.

"The results of analyses of the airborne gamma radiation and total magnetic field survey flown for the region identified as the Death Valley National Topographic Map NJ11-11 is presented in this report"--Abstract.

This report presents the results of analyses of the airborne gamma radiation and total magnetic field survey flown for the Mc Dermitt quadrangle.

Data listings from the area surveyed in a report on the Hot Springs containing averaged record data listings.

Data listings from the area surveyed in a report on the Hot Springs including single record reduced listings.

Single record and averaged record data listings for the Kingman quadrangle in Arizona, California, and Nevada, taken during a reconnaissance survey.