Geophysical surveys at the Getchell and Preble disseminated gold deposits, Humboldt County, Nevada

Abstract

This report is preliminary and has not been reviewed for conformity with U.S. Geological Survey editorial standards.Any use of trade names is for descriptive purposes only and does not imply endorsement by the USGS 'McDermitt GETCHELL N DEPOSIT mw^w /»22>V \ftJ&« -*i f £*»&s.i i w ^iTVi . .' 't V o^^*»^ n^»r*/^v ^«"«v ^ w »ja> -^k * «L_« T-K-*SKS\ »~a«st-ir-â 10 w ?o <o a MUS Figure 1. Location map showing the location of Humboldt County, and approximate location of the Getchell and Preble deposits.

Geophysical surveys in the vicinity of the Pinson and Getchell mines, Humboldt County, Nevada

“…The data are presented with no interpretation in order to effect timely public release. These data supplement telluric data described by Hoover and others (1986) and other geophysical surveys in the vicinity described by Reran and Smith (1984) and Hoover and others (1984). The geology of the Osgood Mountains has been described by Hotz and Willden (1964), the geology of the Getchell mine by Joralemon (1951) and Berger (1975), and the geology of the Pinson and Preble Gold Deposits by Kretschmer (1984).…”

Preliminary compilation of descriptive geoenvironmental mineral deposit models

“…Background and anomalous values depend on bedrock and ore compositions. The average (Levinson, 1980) copper content of soil is 20 ppm (range, 2 to 150 ppm), whereas its average nickel content is 30 ppm (range, 5 to 500 ppm); typical background and anomalous values for platinum-group elements are from 2-10 ppb and greater than 40 ppb (Smith, 1984).…”

“…Ground magnetic and various electromagnetic methods may be used to map faults, fractures, and highly permeable altered zones that may serve as ground water conduits (Heran and Smith, 1984;Heran and McCafferty, 1986;Hoover and others, 1986;Hoekstra and others, 1989). Electrical resistivity methods can delineate hydrothermally altered areas and fault zones as resistivity lows and silicified rock as resistivity highs (Hallof, 1989;Hoekstra and others, 1989;Corbett, 1990).…”