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The Northern Hot Creek Range contains several formerly productive silvergold deposits at Morey and in Hot Creek Canyon, as well as a newly discovered large area of silicified Paleozoic carbonate rocks and shale that is an exploration target for sediment-hosted disseminated gold (Carlin-type) deposits. Geochemical studies of mineralized rock samples from mines, prospects, and outcropping alteration provide a basis for assessing the mineral resource potential of the Morey and Fandango Wilderness Study Areas. Analytical results for 33 elements in 299 rock samples are presented. Two major types of deposits are known in the Northern Hot Creek Range: polymetallic veins rich in silver (as at Morey), and sediment-hosted deposits rich in As-Hg-Mo-Sb-Tl that geologically and geochemically resemble Carl intype disseminated gold deposits. The polymetallic veins with Ag-Cu-Fe-Pb-Zn sulfide minerals occur chiefly in Tertiary welded tuff, but geochemically similar vein deposits occur in three areas of silicified carbonate rocks in and adjacent to the northern part of the Fandango study area. The Page Antimony deposit, in tuff and limestone near Hot Creek Canyon, seems to be generally similar to polymetallic veins at Morey and Tybo, 13 miles to the south (fig. 1), but stibnite (Sb 2 S3 ) is prominent. These polymetallic deposits are very rich in many metals, including Ag, Cu, Mn, Mo, Pb, Sn, Zn, As, Sb, and Bi, and produce prominent geochemical anomalies in rock and stream-sediment samples. Silicified calcareous sedimentary rocks along the intersections of Paleozoic thrust faults with Tertiary high-angle faults, contain very high contents of As, Hg, Mo, Sb, and Tl that often are in excess of 150, 0.5, 15, 20, and 1.0 parts per million, respectively. Gold content of the outcropping silicified rocks and jasperoid is generally less than 0.10 ppm, although gold in the range of 0.10 to 0.3 ppm was detected in eight samples. These geochemical data indicate that an area of about 5 sq mi, with silicification, highly anomalous multi-element geochemistry, and intense brecciation, appears to be favorable for disseminated gold deposits. STUDIES RELATED TO WILDERNESS The Federal Land Policy and Management Act (Public Law 94-579, October 21, 1976) requires the U.S. Geological Survey and U.S. Bureau of Mines to conduct mineral surveys on certain areas to determine their mineral values, if any, that may be present. Results must be made available to the public and be submitted to the President and the Congress. This report presents the results of parts of a geochemical survey of the Morey (NV-060-191) and Fandango (NV-060-190) Wilderness Study Areas, Nye County, Nevada. Part of this work was also done during studies of the Tonopah 1° x 2° quadrangle as part of the Conterminous United States Mineral Assessment Program (CUSMAP). INTRODUCTION The contiguous Morey and Fandango Wilderness Study Areas (WSAs) are located in the northern part of the Hot Creek Range, Nye County, Nevada (fig. 1). For this report, we investigated mines, prospects, and altered rocks in an area of about 56,000 acres of the Morey and Fandango WSAs, as well as in areas within about 5 miles of the WSAs. In this report "wilderness study area" refers to the 56,000-acre area, not to surrounding areas that we also studies. Adjacent to these areas are several mining camps with a history of production dating back to 1866 (Kleinhampl and Ziony, 1984), most notably

Geochemistry of altered and mineralized rocks from the Morey and Fandango Wilderness Study Areas, northern Hot Creek Range, Nye County, Nevada