Preliminary mineral resource assessment of the Tonopah 1° by 2° quadrangle, Nevada

Abstract

This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards and stratigraphic nomenclature. Appendix A A1 Appendix B B1 Favorable Criteria Permissive Host Lithology; High-level calc-alkaline intrusions and intruded rocks. Associated Volcanic/Intrusive Rocks; Quartz diorite to monzogranite and syenite with evidence of several phases of intrusion, one of which is a porphyry commonly with a microaplitic groundmass. Alteration; Potassic, sericitic, and argillic. Also, sodic-calcic, propylitic, and, occassionally, advanced-argillic alteration are reported. Geochemical Signature; An association of Cu with Mo, gold (Au), silver (Ag), W, boron (B), and (or) strontium (Sr) near the center of the deposit with possible lead (Pb), Zn, Au, As, antimony (Sb), selenium (Se), manganese (Mn), and barium (Ba) in distal areas. Associated Deposit Types; Lead-zinc skarn, polymetallic replacement, copper skarn, replacement manganese deposits, porphyry copper-molybdenum, porphyry copper-gold. Occurrences of Pb, Zn, and Cu within the Tonopah quadrangle are listed in table 5. Additional Geologic Features; Stockworks of quartz veinlets are strongly favorable for this deposit type.

Metallogenic map of volcanogenic massive-sulfide deposits in pre-Tertiary island-arc and ocean-basin environments in Nevada; Volcanogenic massive-sulfide map series

“…The sparse descriptive information available about copper occurrences includes some features in common with peripheral parts of massivesulfide deposits (such as stringers, disseminated sulfides, barite), but these deposits fit equally well into polymetallic vein, and (or) polymetallic replacement, copper skarn, or porphyry copper deposit types that are identified and considered permissive for this area (Orris and Kleinhampl, 1986).…”

Spatial analysis of geochemical and geologic information from the Tonopah 1° x 2° quadrangle, Nevada

“…Application of computer technology expedites the process, but as is the case with manual methods, results from the analysis will be constrained by the integrity of the data and the assumptions upon which the analysis is based. The abundant geochemical and geologic information that was gathered for the Tonopah 1 °X2° quadrangle during the Conterminous United States Mineral Assessment Program (CUSMAP) and that has been interpreted in various ways (Nash, 1988;Orris and Kleinhampl, 1986;John, 1987) is an excellent database for experimental application of newly developed computer technology (Dwyer and others, 1987). In this report we discuss computer techniques available for spatial analysis of geologic information using integrated computer hardware and software called a geographic information system (GIS).…”