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J. S. \(")A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 1019 1750 M -0.258 0 (Tien"\) Grauch)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 821 1809 M 0.030 0 (phone: 303-236-1393)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 821 1868 M -0.625 0 (email: )A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 966 1868 M -0.265 0 (tien@usgs.gov)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 821 1927 M -0.193 0 (U. S. Geological Survey)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 821 1986 M 0.082 0 (Box 25046, MS 964)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 821 2045 M -0.196 0 (Federal Center)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 821 2104 M -0.035 0 (Denver, CO 80225)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 1212 2104 M 0.070 0 (-0046)A ; LH pagesave restore (%%[ Page: 3 ]%%) = %%PageTrailer %%Page: 4 4 %%BeginPageSetup [{ %%BeginFeature: *VMOption Standard %%EndFeature } stopped cleartomark [{ } stopped cleartomark [{ %%BeginFeature: *InputSlot AutoSelect Tray %%EndFeature } stopped cleartomark [{ %%BeginFeature: *Duplex %%EndFeature } stopped cleartomark userdict begin /pagesave save def end mysetup concat colspRefresh : 1.000 1.000 1.000 sco 0 0 2550 3300 rf ; %%EndPageSetup : 0 0 2546 3295 rc 0 0 0 sco %%IncludeFont: Times-Roman (F0) cvn 0.900 (Times-Roman) cvn /Type1 T (Times-Roman) cvn mF (F0_50) cvn F0 50 xF F0_50 Ji 1340 3043 M -1.900 0 (i)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 1015 302 M -0.006 0 (TABLE OF CONTENTS)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 1946 386 M -0.050 0 (Page)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 495 M 0.015 0 (Abstract\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205 1)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 604 M 0.062 0 (Introduction\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205.. 1)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 713 M -0.038 0 (Data Collection\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205. 2)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 822 M 0.035 0 (Elevation Control for the USGS data.\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205.. 3)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 931 M 0.034 0 (Data Reduction\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205.. 4)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1040 M -0.220 0 (Digital File Descriptions\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205 4)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1149 M -0.019 0 (Post File Format\205\205\205.\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205 6)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1258 M -0.099 0 (Acknowledgments\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205. 6)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1367 M -0.086 0 (References Cited\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205 6)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 1177 1510 M -0.150 0 (TABLES)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1594 M -0.137 0 (Table 1. File Descriptions\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205. 5)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 1077 1712 M -0.065 0 (ILLUSTRATIONS)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1796 M -0.065 0 (Figure 1.\227Location of Getchell gold trend\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205.. 9)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1905 M -0.186 0 (Figure 2.\227Location of gravity profiles in the Osgood Mountains area shown with)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 371 1964 M 0.091 0 ( topographic contours\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205.. 10)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 2073 M -0.342 0 (Figure 3.\227Location of gravity profiles in the Slumbering Hills area shown with)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 371 2132 M 0.091 0 ( topographic contours\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205\205.. 11)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 2241 M -0.178 0 (Figure 4.\227Description of gravity base station at Winnemucca airport\205\205\205\205\205\205 12)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 1123 2359 M -0.080 0 (APPENDIX A)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 2443 M -0.207 0 (Listing of gravity principal facts\205\205\205\205\205\205..\205\205\205\205\205\205\205\205\205\205\205\205\205\205.. 13)A ; LH pagesave restore (%%[ Page: 4 ]%%) = %%PageTrailer %%Page: 5 5 %%BeginPageSetup [{ %%BeginFeature: *VMOption Standard %%EndFeature } stopped cleartomark [{ } stopped cleartomark [{ %%BeginFeature: *InputSlot AutoSelect Tray %%EndFeature } stopped cleartomark [{ %%BeginFeature: *Duplex %%EndFeature } stopped cleartomark userdict begin /pagesave save def end mysetup concat colspRefresh : 1.000 1.000 1.000 sco 0 0 2550 3300 rf ; %%EndPageSetup : 1183 3041 175 109 rc 0 0 0 sco %%IncludeFont: Times-Roman (F0) cvn 0.900 (Times-Roman) cvn /Type1 T (Times-Roman) cvn mF (F0_50) cvn F0 50 xF F0_50 Ji 1333 3043 M (1)S ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 1141 361 M -0.269 0 (ABSTRACT)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 446 445 M -0.204 0 (This report presents principal facts for gravity stations collected along profiles near the)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 504 M -0.212 0 (Osgood Mountains and Slumbering Hills, north-central Nevada. These include \(1\) data collected)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 563 M -0.017 0 (near the )A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 468 563 M -0.146 0 (Osgood Mountains by U. S. Geological Survey \()A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 1435 563 M -0.157 0 (USGS\) personnel in the years 1989,)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 622 M 0.051 0 (1990, and 1993; and \(2\) data released to the )A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 1187 622 M -0.098 0 (USGS by Battle Mountain Gold \(now Battle)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 681 M -0.092 0 (Mountain Exploration\) that were collected in 1989 near the )A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 1489 681 M -0.052 0 (Osgood Mountains and the)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 740 M -0.741 0 (Slumbering Hills.)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 446 849 M -0.180 0 (The digital data, text of this report \(figures in separate files\) can be downloaded via)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 908 M -0.326 0 ('anonymous ftp' from a )A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 762 908 M -0.306 0 (USGS system named )A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 1194 908 M -0.011 0 (greenwood.cr.usgs.gov \(136.177.21.122\). The files)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 967 M -0.162 0 (are located in a directory named /pub/open-file-reports/)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 1395 967 M -0.156 0 (ofr-97-0085 and are described in an ASCII)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1026 M -0.723 0 (file named )A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 513 1026 M -0.272 0 (readme.txt. This information is also contained below in Table 1.)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 1082 1135 M 0.025 0 (INTRODUCTION)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 446 1219 M -0.229 0 (This report presents principal facts for gravity stations collected along profiles in the)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1278 M -0.096 0 (Getchell trend area, Osgood Mountains, north-central Nevada. These include \(1\) data collected)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1337 M -0.137 0 (near the Osgood Mountains by U. S. Geological Survey \(USGS\) personnel in the years 1989,)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1396 M -0.019 0 (1990, and 1993; and \(2\) data released to the USGS by Battle Mountain Gold \(now Battle)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1455 M -0.080 0 (Mountain Exploration\) that were collected in 1989 near the Osgood Mountains and the)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1514 M -0.246 0 (Slumbering Hills. The gravity data collected by the USGS were intended to supplement studies)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1573 M -0.124 0 (related to the USGS Getchell trend airborne geophysics demonstration project, which was most)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1632 M -0.105 0 (active during the years 1988-1992. The Getchell gold trend is located on the east side of the)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1691 M -0.206 0 (Osgood Mountains and was originally so-named due to the north-northeast alignment of five)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1750 M -0.255 0 (sedimentary-hosted disseminated gold deposits \(often called Carlin-type deposits\): Preble,)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1809 M -0.184 0 (Pinson, Mag, Getchell, and Twin Creeks mines \(Figure 1\). The airborne demonstration project)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1868 M -0.224 0 (was designed to employ a diverse set of geophysical and remote-sensing techniques to )A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 2017 1868 M -0.006 0 (test the)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1927 M 0.048 0 (application of integrated and comprehensive airborne geophysical surveying for mineral)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1985 M 0.011 0 (exploration or assessment in covered terranes)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 1206 1985 M -0.285 0 (. Using a diversity of data-acquisition techniques)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 2044 M -0.178 0 (helps optimize constraints on subsurface interpretations as opposed to using only one technique)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 2190 2044 M 0.500 0 (.)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 446 2153 M -0.218 0 (A desire for further diversity of techniques in the Getchell trend demonstration project led)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 2212 M -0.134 0 (the USGS to acquire gravity data to complement the airborne geophysical data. Gravity methods)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 2271 M -0.244 0 (are designed to determine variations in the Earth\222s gravity field that are due to differences in bulk)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 2330 M -0.221 0 (densities of the rocks in the subsurface. In the Getchell trend area, the most significant density)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 2389 M -0.272 0 (differences occur at basin-and-range faults that juxtapose low-density alluvium against moderate-)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 2448 M -0.180 0 (to high-density bedrock. Thus, gravity data can provide excellent guides for detecting and)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 2507 M -0.343 0 (defining these types of faults in this area.)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 446 2616 M 0.082 0 (Prior to the initiation of the Getchell trend demonstration project, gravity data acquisition)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 2674 M 0.072 0 (had been limited. During the project, gravity data were collected along profiles selected to)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 2732 M 0.048 0 (match several individual flight lines in the airborne aeromagnetic/electromagnetic survey. These)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 2790 M 0.048 0 (lines were flown specifically to span longer distances on either side of the main survey area)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 2848 M 0.096 0 (\(Grauch and Bankey, 1994\). Acquiring gravity data )A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 1359 2848 M -0.073 0 (at a spacing to give coverage comparable to)A ; LH pagesave restore (%%[ Page: 5 ]%%) = %%PageTrailer %%Page: 6 6 %%BeginPageSetup [{ %%BeginFeature: *VMOption Standard %%EndFeature } stopped cleartomark [{ } stopped cleartomark [{ %%BeginFeature: *InputSlot AutoSelect Tray %%EndFeature } stopped cleartomark [{ %%BeginFeature: *Duplex %%EndFeature } stopped cleartomark userdict begin /pagesave save def end mysetup concat colspRefresh : 1.000 1.000 1.000 sco 0 0 2550 3300 rf ; %%EndPageSetup : 1183 3041 175 109 rc 0 0 0 sco %%IncludeFont: Times-Roman (F0) cvn 0.900 (Times-Roman) cvn /Type1 T (Times-Roman) cvn mF (F0_50) cvn F0 50 xF F0_50 Ji 1333 3043 M (2)S ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 302 M -0.263 0 (the coverage of the airborne data would have been prohibitively expensive. The profiles collected)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 361 M -0.101 0 (for Battle Mountain Gold were part of the company's exploration program.)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 446 470 M 0.049 0 (Ground-based electrical, magnetic, and gravity data collected before the airborne surveys)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 528 M 0.094 0 (were flown are presented in Abrams and others \(1984\), Heran and Smith \(1984\), Heran and)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 586 M 0.101 0 (McCafferty \(1986\), and Hoover and others \(1984; 1986\). The gravity data reported in Abrams)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 644 M 0.053 0 (and others \(1984\) are partly superseded by the profile data presented here \(discussed below\).)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 446 752 M -0.274 0 (The Getchell digital airborne geophysical data were originally released through the U.S.)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 811 M -0.243 0 (Department of Commerce's National Geophysical Data Center in February, 1989. Digital grids of)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 870 M -0.129 0 (many of these data sets are contained in Grauch and others \(1993\), along with interpretative grids)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 929 M -0.222 0 (and descriptions of the survey specifications and data files. Other publications related to the)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 988 M -0.292 0 (airborne geophysical demonstration project include)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 1309 988 M 0.090 0 ( Hoover and others \(1991\), who reviewed)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1047 M 0.089 0 (preliminary results of all the airborne surveys; Pitkin, \(1991, gamma-ray data\); Grauch and)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1105 M 0.066 0 (Bankey, \(1991, aeromagnetic data\); and Pierce and Hoover \(1991, electromagnetic data\). Maps)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1163 M 0.035 0 (at 1:100,000 scale and brief discussions of the aeromagnetic and electromagnetic data are)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1221 M 0.074 0 (presented in Grauch and Bankey \(1994\) and Wojniak and others \(1994\), respectively. Further)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1279 M 0.068 0 (discussions of the data are contained in Grauch and others \(1991\), Wojniak and Hoover \(1991\),)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1337 M 0.093 0 (and Grauch and Hoover \(1993\).)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 1039 1445 M -0.147 0 (DATA COLLECTION)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 446 1529 M -0.210 0 (Gravity measurements were acquired along profiles IP \(Iron Point\), FMG \(FirstMiss)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1588 M -0.121 0 (Gold\), and OC \(Osgood Creek\) by the USGS in 1989; along profile SR \(south regional\) by the)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1647 M -0.241 0 (USGS in 1990 and 1993; and along profiles LB1, LB2, LB3, FM2, and FM3 by Mining)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1706 M -0.229 0 (Geophysical Surveys for Battle Mountain Gold Company in 1989. Locations of these profiles are)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1765 M -0.151 0 (shown in Figures 2 and 3. Data descriptions for the profiles collected by the USGS and those)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1824 M -0.378 0 (collected by Mining Geophysical Surveys are described separately below.)A ; : 0 0 2546 3295 rc 0 0 0 sco %%IncludeFont: Times-Italic (F2) cvn 0.900 (Times-Italic) cvn /Type1 T (Times-Italic) cvn mF (F2_50) cvn F2 50 xF F2_50 Ji 296 1933 M -0.004 0 (USGS Profiles)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 446 2042 M -0.138 0 (Data for profiles IP, FMG, and OC were acquired using LaCoste-Romberg gravity meter)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 2101 M -0.148 0 (G-2 in 1989. Data for profile SR were collected in 1990 using LaCoste-Romberg gravity meter)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 2160 M -0.161 0 (G-550 and in 1993 using LaCoste-Romberg gravity meter G-191. The hiatus in data collection of)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 2219 M -0.456 0 (profile SR was caused by equipment failure and scheduling difficulties.)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 446 2328 M -0.148 0 (Locations along all profiles were surveyed using a Hewlett-Packard total station. The)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 2387 M -0.369 0 (profile lines were initially planned to match as closely as possible the location and orientation)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 2446 M 0.165 0 (\(about N58)A ; : 0 0 2546 3295 rc 0 0 0 sco (F0_31) cvn F0 31 xF F0_31 Ji 524 2440 M -0.500 0 (o)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 539 2446 M -0.280 0 (W\) of the extra-long flight lines in the airborne/electromagnetic survey \(Grauch and)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 2505 M -0.255 0 (Bankey, 1994\). Reference positions along the profiles were determined by triangulation from)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 2564 M -0.211 0 (points with known control, such as benchmarks, section corners, and surveyed drill-hole)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 2623 M -0.278 0 (locations. The locations of individual stations were determined by turning horizontal and vertical)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 2682 M -0.138 0 (angles from a reference point. Back-surveying the locations of stations was not attempted)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 2741 M -0.331 0 (because of the considerable logistical difficulties involved and because the flat terrain of the area)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 2800 M -0.166 0 (lessened the need for the accurate positioning that is usually required for terrain corrections)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 2859 M -0.152 0 (during gravity data reduction. Distances between stations were generally 305 m \(1000 feet\).)A ; LH pagesave restore (%%[ Page: 6 ]%%) = %%PageTrailer %%Page: 7 7 %%BeginPageSetup [{ %%BeginFeature: *VMOption Standard %%EndFeature } stopped cleartomark [{ } stopped cleartomark [{ %%BeginFeature: *InputSlot AutoSelect Tray %%EndFeature } stopped cleartomark [{ %%BeginFeature: *Duplex %%EndFeature } stopped cleartomark userdict begin /pagesave save def end mysetup concat colspRefresh : 1.000 1.000 1.000 sco 0 0 2550 3300 rf ; %%EndPageSetup : 1183 3041 175 109 rc 0 0 0 sco %%IncludeFont: Times-Roman (F0) cvn 0.900 (Times-Roman) cvn /Type1 T (Times-Roman) cvn mF (F0_50) cvn F0 50 xF F0_50 Ji 1333 3043 M (3)S ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 446 302 M -0.083 0 (The gravity stations were referenced to the U.S. Department of Defense base station)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 361 M -0.215 0 (ACIC0474-1 at Winnemucca, Nevada \(figure 4\), which is part of the International Gravity)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 420 M -0.141 0 (Standardization Net, 1971 \(International Association of Geodesy, 1974\). An additional)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 479 M -0.137 0 (temporary base, tied to the primary base, was set for convenience of operation. Linear meter-drift)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 538 M -0.190 0 (was calculated by making repeat observations at the primary or temporary base.)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 446 647 M -0.253 0 (Profile FMG is generally located along a portion of the same profile as reported in Abrams)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 706 M -0.076 0 (and others \(1984; stations 112-132\). Comparison of gravity data from the two different periods)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 765 M -0.277 0 (of data collection at nearly coincident stations show differences as much as 0.5 mGal, which can)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 824 M -0.290 0 (present some difficulties in data processing and interpretation. These differences may be caused)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 883 M -0.233 0 (by inaccuracies in the locations of the stations collected by Abrams and others; they located these)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 942 M -0.250 0 (stations by inspection of 1:24,000-scale topographic maps and by distance estimates made in)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1001 M -0.025 0 (reference to power poles along the road \(G. Abrams, oral commun., 1993\). Therefore, the more)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1060 M -0.107 0 (recently acquired data are judged to supersede the earlier data along the extent of the FMG profile)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1119 M -0.090 0 (because the positions of the more recent data were measured more accurately.)A ; : 0 0 2546 3295 rc 0 0 0 sco %%IncludeFont: Times-Italic (F2) cvn 0.900 (Times-Italic) cvn /Type1 T (Times-Italic) cvn mF (F2_50) cvn F2 50 xF F2_50 Ji 296 1228 M -0.031 0 (Company Profiles)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 446 1337 M -0.119 0 (Profiles LB1, LB2, and LB3 near Lone Butte, profiles FM2 and FM3 near Iron Point)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1396 M -0.272 0 (\(figure 2\), and profiles SH1 and SH2 near the Slumbering Hills \(figure 3\) were collected by)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1455 M -0.279 0 (Mining Geophysical Company in 1989 using LaCoste-Romberg gravity meter G-849. Location)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1514 M -0.246 0 (maps and original records of meter readings, including station elevation and location, were)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1573 M -0.168 0 (obtained by the USGS from Battle Mountain Gold Company in 1990. Information on how the)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1632 M -0.249 0 (station positions and elevations were determined was not available.)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 446 1741 M -0.083 0 (The gravity stations were referenced to the U.S. Department of Defense base station)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1800 M -0.215 0 (ACIC0474-1 at Winnemucca, Nevada \(figure 4\), which is part of the International Gravity)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1859 M -0.141 0 (Standardization Net, 1971 \(International Association of Geodesy, 1974\). An additional)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1918 M -0.137 0 (temporary base, tied to the primary base, was set for convenience of operation. Linear meter-drift)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1977 M -0.190 0 (was calculated by making repeat observations at the primary or temporary base.)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 750 2086 M -0.027 0 (ELEVATION CONTROL FOR THE USGS DATA)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 446 2170 M -0.192 0 (The station elevations for the USGS data were obtained by turning vertical angles from)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 2229 M -0.098 0 (known control using the HP total station. Known control points were primarily referenced to)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 2288 M -0.205 0 (accurately surveyed elevation points on 1:24,000-scale topographic maps. Using this technique,)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 2347 M -0.243 0 (elevations may have errors generally within 2 feet \(60 cm\) from the known control points)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 2406 M -0.196 0 (depending on climatic conditions. However, errors in the estimation of terrain corrections give)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 2465 M -0.117 0 (rise to the greatest uncertainty in Bouguer anomaly values. Computer-generated terrain)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 2524 M -0.105 0 (corrections for flat areas, as is the case for most of the stations in this report, are generally)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 2583 M -0.200 0 (negligible. Where the stations are located within more moderate relief near the Osgood)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 2642 M -0.131 0 (Mountains, the terrain was digitized from 1:24,000 scale topographic maps. The error in)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 2701 M -0.209 0 (elevation from these maps is 10 feet \(3 m\), half the contour interval.)A ; LH pagesave restore (%%[ Page: 7 ]%%) = %%PageTrailer %%Page: 8 8 %%BeginPageSetup [{ %%BeginFeature: *VMOption Standard %%EndFeature } stopped cleartomark [{ } stopped cleartomark [{ %%BeginFeature: *InputSlot AutoSelect Tray %%EndFeature } stopped cleartomark [{ %%BeginFeature: *Duplex %%EndFeature } stopped cleartomark userdict begin /pagesave save def end mysetup concat colspRefresh : 1.000 1.000 1.000 sco 0 0 2550 3300 rf ; %%EndPageSetup : 1183 3041 175 109 rc 0 0 0 sco %%IncludeFont: Times-Roman (F0) cvn 0.900 (Times-Roman) cvn /Type1 T (Times-Roman) cvn mF (F0_50) cvn F0 50 xF F0_50 Ji 1333 3043 M (4)S ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 1051 302 M -0.086 0 (DATA REDUCTION)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 446 386 M -0.114 0 (Computer programs existing at the USGS were used to obtain principal facts and terrain-)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 445 M -0.226 0 (corrected gravity values from all the profile data. A program written by M. Webring and R. Wahl)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 504 M -0.005 0 (\(USGS, unpub. program, 1983\) was used to reduce data from the IP, FMG, and OC profiles. An)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 563 M -0.071 0 (updated version of this program, written by M. Webring \(unpub. program, 1996\), was used to)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 622 M -0.069 0 (reduce data from the rest of the profiles. These programs reduced the gravity meter-readings to)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 681 M -0.256 0 (observed-gravity values by calculating and correcting for earth-tide and linear meter-drift, and)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 740 M -0.185 0 (computed free-air and Bouguer anomalies using the vertical gradient and curvature equations)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 799 M -0.073 0 (given by Cordell and others \(1982\) and in the computer program BOUGUER \(Godson, 1988\).)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 858 M -0.219 0 (The theoretical gravity value was calculated using the 1967 formula of the Geodetic Reference)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 917 M -0.178 0 (System \(International Association of Geodesy, 1971\).)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 446 1026 M -0.058 0 (Outer-zone and some inner-zone terrain corrections were computed using a program that)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1085 M -0.101 0 (corrects for the gravity effects of terrain from a radius of 0.865 km to a radius 166.7 km away)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1144 M -0.097 0 (from each station using the method of Plouff \(1977\). These computed terrain corrections use)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1203 M -0.126 0 (mean-elevation data digitized on a 15-second grid for corrections from 0.865 to 5 km, 1-minute)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1262 M -0.004 0 (terrain data for corrections from 5 to 21 km, and 3-minute terrain data for corrections from 21 to)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1321 M -0.155 0 (166.7 km. A density of 2.67 g/cm)A ; : 0 0 2546 3295 rc 0 0 0 sco (F0_31) cvn F0 31 xF F0_31 Ji 977 1315 M 0.375 0 (3 )A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 1001 1321 M -0.124 0 (was used to calculate terrain corrections, giving the)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1380 M -0.383 0 (corrections and gravity anomaly values listed in Appendix A.)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 446 1489 M -0.042 0 (For stations along profiles IP, FMG, and OC near steep topography, inner-zone \(0 to)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1548 M -0.170 0 (0.865 km\) corrections were calculated using the method of M. Webring \(USGS, unpublished,)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1607 M -0.176 0 (1984\). This method incorporates the minimum-curvature gridding algorithm of Briggs \(1974\) to)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1666 M -0.165 0 (define the topographic surface close to the station using hand-digitized data and calculates the)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1725 M -0.390 0 (gravity effects of small cylindrical sections of the Hammer zones using the method of Olivier and)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1784 M -0.125 0 (Simard \(1981\).)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 927 1952 M 0.038 0 (DIGITAL FILE DESCRIPTIONS)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 446 2036 M -0.188 0 (The digital data and text of this report \(figures in separate files\) can be downloaded via)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 2095 M -0.149 0 ('anonymous ftp' from a USGS system named greenwood.cr.usgs.gov \(136.177.21.122\). The files)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 2154 M -0.162 0 (are located in a directory named /pub/open-file-reports/)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 1395 2154 M -0.156 0 (ofr-97-0085 and are described in an ASCII)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 2213 M -0.338 0 (file named readme.txt. This information is also contained below in Table 1.)A ; LH pagesave restore (%%[ Page: 8 ]%%) = %%PageTrailer %%Page: 9 9 %%BeginPageSetup [{ %%BeginFeature: *VMOption Standard %%EndFeature } stopped cleartomark [{ } stopped cleartomark [{ %%BeginFeature: *InputSlot AutoSelect Tray %%EndFeature } stopped cleartomark [{ %%BeginFeature: *Duplex %%EndFeature } stopped cleartomark userdict begin /pagesave save def end mysetup concat colspRefresh : 1.000 1.000 1.000 sco 0 0 2550 3300 rf ; %%EndPageSetup : 1183 3041 175 109 rc 0 0 0 sco %%IncludeFont: Times-Roman (F0) cvn 0.900 (Times-Roman) cvn /Type1 T (Times-Roman) cvn mF (F0_50) cvn F0 50 xF F0_50 Ji 1333 3043 M (5)S ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 916 411 M 0.076 0 (TABLE 1. FILE DESCRIPTIONS)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 336 495 M -0.139 0 (FILE NAME)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 841 495 M 0.106 0 (FILE TYPE)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 1550 495 M 0.091 0 (DESCRIPTION)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 303 554 M -0.092 0 (----data files-----)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 366 672 M -0.708 0 (profiles.lis)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 875 672 M -0.315 0 (ascii text)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 1286 672 M -0.450 0 (Listing of principal facts in 80-column)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 1286 731 M -0.361 0 (format with labeled columns; the same as)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 1286 790 M -0.482 0 (Appendix A.)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 353 908 M -0.308 0 (profiles.pos)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 721 908 M -0.389 0 (UNIX binary, sequential)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 735 967 M -0.208 0 (post file \(see below for)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 746 1026 M -0.173 0 (description of format\))A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 1286 908 M -0.185 0 (Station identifier, longitude \(degrees\),)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 1286 967 M -0.260 0 (latitude \(degrees\), and six channels of)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 1286 1026 M -0.374 0 (principal facts \(see below\) for all profile)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 1286 1085 M 0.240 0 (data.)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 356 1144 M -0.425 0 (profiles.asc)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 721 1144 M -0.360 0 (ascii post file \(see below)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 710 1203 M -0.138 0 (for description of format\))A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 1286 1144 M -0.355 0 (Same as profiles.bin but in ascii Fortran)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 1286 1203 M 0.085 0 (format \(a8, 8g16.8\).)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 316 1380 M -0.021 0 (-----figures-----)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 390 1498 M -0.463 0 (fig1.eps)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 390 1557 M -0.463 0 (fig2.eps)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 390 1616 M -0.463 0 (fig3.eps)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 390 1675 M -0.463 0 (fig4.eps)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 732 1498 M -0.096 0 (encapsulated postscript)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 1286 1498 M -0.141 0 (Figures 1, 2, 3, and 4 in encapsulated)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 1286 1557 M -0.022 0 (postscript, no preview.)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 402 1793 M -0.688 0 (fig1.tif)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 402 1852 M -0.688 0 (fig2.tif)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 402 1911 M -0.688 0 (fig3.tif)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 402 1970 M -0.688 0 (fig4.tif)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 721 1793 M -0.373 0 (tagged image file format)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 1286 1793 M -0.212 0 (Figures 1, 2, 3, and 4 in ".tif" bitmap)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 1286 1852 M -0.390 0 (format \(binary\))A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 390 2088 M -0.463 0 (fig1.prn)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 390 2147 M -0.463 0 (fig2.prn)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 390 2206 M -0.463 0 (fig3.prn)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 390 2265 M -0.463 0 (fig4.prn)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 766 2088 M -0.273 0 (postscript print files)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 1286 2088 M -0.034 0 (Figures 1, 2, 3, and 4 in a format to print)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 1286 2147 M -0.019 0 (on 300 dpi postscript printers.)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 328 2383 M 0.325 0 (----text--------)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 362 2501 M -0.045 0 (readme.txt)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 875 2501 M -0.315 0 (ascii text)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 1286 2501 M -0.495 0 (Text describing digital files.)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 397 2619 M 0.338 0 (text.txt)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 875 2619 M -0.315 0 (ascii text)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 1286 2619 M -0.173 0 (A file containing the text of this report,)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 1286 2678 M -0.203 0 (without figures or Appendix A.)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 391 2737 M 0.106 0 (text.prn)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 776 2737 M -0.264 0 (postscript print file)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 1286 2737 M -0.094 0 (A print file of the text of this report,)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 1286 2796 M -0.059 0 (without figures, for 300 dpi postscript)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 1286 2855 M -0.139 0 (printers.)A ; LH pagesave restore (%%[ Page: 9 ]%%) = %%PageTrailer %%Page: 10 10 %%BeginPageSetup [{ %%BeginFeature: *VMOption Standard %%EndFeature } stopped cleartomark [{ } stopped cleartomark [{ %%BeginFeature: *InputSlot AutoSelect Tray %%EndFeature } stopped cleartomark [{ %%BeginFeature: *Duplex %%EndFeature } stopped cleartomark userdict begin /pagesave save def end mysetup concat colspRefresh : 1.000 1.000 1.000 sco 0 0 2550 3300 rf ; %%EndPageSetup : 1183 3041 175 109 rc 0 0 0 sco %%IncludeFont: Times-Roman (F0) cvn 0.900 (Times-Roman) cvn /Type1 T (Times-Roman) cvn mF (F0_50) cvn F0 50 xF F0_50 Ji 1333 3043 M (6)S ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 1041 302 M -0.072 0 (POST FILE FORMAT)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 446 386 M -0.234 0 (USGS post file format consists of an eight-character station identifier, followed by eight)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 445 M -0.238 0 (real numbers, called channels. The channels for the post files associated with this report are)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 504 M -0.300 0 (described below.)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 530 722 M -0.264 0 (CHANNEL)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 1046 722 M 0.091 0 (DESCRIPTION)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 636 781 M (1)S ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 1046 781 M -0.228 0 (Longitude in decimal degrees \(west longitudes are)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 1046 840 M -0.339 0 (negative\))A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 636 899 M (2)S ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 1046 899 M -0.335 0 (Latitude in decimal degrees)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 636 958 M (3)S ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 1046 958 M -0.246 0 (Station altitude in meters above sea level)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 636 1017 M (4)S ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 1046 1017 M -0.305 0 (Observed gravity in mGal with a constant value of)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 1046 1076 M -0.228 0 (980,000 mGal removed)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 636 1135 M (5)S ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 1046 1135 M -0.159 0 (Inner-zone terrain correction \(zones A-F\), in mGal)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 636 1194 M (6)S ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 1046 1194 M -0.072 0 (Outer-zone terrain correction \(zones G-X\), in mGal)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 636 1253 M (7)S ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 1046 1253 M -0.503 0 (Free-air gravity anomaly, in mGal)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 636 1312 M (8)S ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 1046 1312 M -0.076 0 (Complete \(terrain-corrected\) Bouguer anomaly, reduced)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 1046 1371 M -0.309 0 (using a density of 2.67 g/cc, in mGal)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 1009 1489 M -0.247 0 (ACKNOWLEDGMENTS)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 446 1573 M -0.246 0 (We are grateful to Wayne Wojniak, who helped collect field data; to Mike Webring, for)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1632 M -0.162 0 (helpful suggestions on terrain corrections and references for gravity reduction equations; and to)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1691 M -0.131 0 (Battle Mountain Exploration, who graciously donated their gravity data.)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 1033 1800 M 0.084 0 (REFERENCES CITED)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1934 M -0.087 0 (Abrams, G. A., Moss, C. K., and Schutter, T. A., 1984, Principal facts for gravity stations in the)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 371 1993 M -0.125 0 (Osgood Mountains, Humbolt County, Nevada: U. S. Geological Survey Open-File Report)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 371 2052 M 0.181 0 (84-835, 11 p.)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 2161 M -0.157 0 (Briggs, I. C., 1974, Machine contouring using minimum curvature: Geophysics, v. 39, no. 1, p.)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 371 2220 M 0.142 0 (39-48.)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 2329 M -0.160 0 (Cordell, Lindrith, Keller, G. R., and Hildenbrand, T. G., 1982, Bouguer gravity map of the Rio)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 371 2388 M -0.172 0 (Grande Rift, Colorado, New Mexico, and Texas: U. S. Geological Survey Geophysical)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 371 2447 M -0.102 0 (Investigations Series Map GP-949, scale 1:1,000,000.)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 2556 M -0.237 0 (Defense Mapping Agency, 1974, World Relative Gravity Reference Network, North America,)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 371 2615 M -0.120 0 (Part 2: St. Louis, Missouri, Aerospace Center, DMAAC Reference Publication 25, with)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 371 2674 M -0.177 0 (supplement updating gravity values to the International Gravity Standardization Net 1971,)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 371 2733 M 0.143 0 (1635 p.)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 2842 M -0.006 0 (Godson, R. H., 1988, BOUGUER: gravity-terrain-correction program for micro-computers,)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 371 2901 M -0.044 0 (version 1.0: U.)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 680 2901 M -0.143 0 ( S. Geological Survey Open-File Report 88-644B,)A ; LH pagesave restore (%%[ Page: 10 ]%%) = %%PageTrailer %%Page: 11 11 %%BeginPageSetup [{ %%BeginFeature: *VMOption Standard %%EndFeature } stopped cleartomark [{ } stopped cleartomark [{ %%BeginFeature: *InputSlot AutoSelect Tray %%EndFeature } stopped cleartomark [{ %%BeginFeature: *Duplex %%EndFeature } stopped cleartomark userdict begin /pagesave save def end mysetup concat colspRefresh : 1.000 1.000 1.000 sco 0 0 2550 3300 rf ; %%EndPageSetup : 1183 3041 175 109 rc 0 0 0 sco %%IncludeFont: Times-Roman (F0) cvn 0.900 (Times-Roman) cvn /Type1 T (Times-Roman) cvn mF (F0_50) cvn F0 50 xF F0_50 Ji 1333 3043 M (7)S ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 302 M -0.207 0 (Grauch, V.J.S., and Bankey, Viki, 1991, Preliminary results of aeromagnetic studies of the)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 371 361 M -0.165 0 (Getchell disseminated gold deposit trend, Osgood Mountains, north-central Nevada, in)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 371 420 M -0.164 0 (Raines, G.L., Lisle, R.E., Schafer, R.W., and Wilkinson, W.H., eds., Geology and Ore)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 371 479 M -0.179 0 (Deposits of the Great Basin, Symposium Proceedings: Geological Society of Nevada, Reno,)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 371 538 M 0.177 0 (NV, p. 781-792.)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 647 M -0.166 0 (Grauch, V.J.S., and Bankey, Viki, 1994, Aeromagnetic and related maps of the Getchell gold)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 371 706 M -0.129 0 (trend area, Osgood Mountains, north-central Nevada: U.S. Geological Survey Geophysical)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 371 765 M -0.002 0 (Map GP-1003-B, scale 1:100,000.)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 874 M -0.101 0 (Grauch, V.J.S., and Hoover, D.B., 1993, Locating buried conductive material along the Getchell)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 371 933 M -0.117 0 (trend, Osgood Mountains, Nevada: Implications for gold exploration and the carbon-gold)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 371 992 M -0.149 0 (association\(?\): U.S. Geological Survey Bulletin 2039, p. 237-244.)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1101 M -0.045 0 (Grauch, V.J.S., Hoover, D.B., and Wojniak, W.S., 1991, Subsurface structure and lithology near)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 371 1160 M -0.204 0 (the Getchell gold trend, Osgood Mountains, Nevada\227geophysical insights: U.S. Geological)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 371 1219 M -0.107 0 (Survey Circular 1062, p. 34.)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1328 M -0.090 0 (Grauch, V.J.S., Phillips, J. D., Hoover, D. B., Pitkin, J. A., Livo, K. E., and McCafferty, Anne,)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 371 1387 M -0.063 0 (1993, Materials provided at the workshop "Geophysical Map Interpretation on the PC",)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 371 1446 M -0.081 0 (convened April 21-22, 1993: U. S. Geological Survey Open-File Report 93-560, 150 p., 14)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 371 1505 M -0.050 0 (diskettes.)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1614 M -0.312 0 (Heran, W.D., and McCafferty, Anne, 1986, Geophysical surveys in the vicinity of the Pinson and)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 371 1673 M -0.217 0 (Getchell mines, Humboldt County, Nevada: U.S. Geological Survey Open-File Report 86-)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 371 1732 M 0.200 0 (432, 40 p.)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1841 M -0.231 0 (Heran, W.D., and Smith, B.D., 1984, Geophysical surveys at the Getchell and Preble disseminated)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 371 1900 M -0.113 0 (gold deposits, Humboldt County, Nevada: U.S. Geological Survey Open-File Report 84-795,)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 371 1959 M 0.200 0 (78 p.)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 2068 M 0.020 0 (Hoover, D.B., Grauch, V.J.S., Pitkin, J.A., Krohn, M.D., and Pierce, H.A., 1991, An integrated)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 371 2127 M -0.196 0 (airborne geophysical study along the Getchell trend of gold deposits, north-central Nevada, in)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 371 2186 M -0.164 0 (Raines, G.L., Lisle, R.E., Schafer, R.W., and Wilkinson, W.H., eds., Geology and Ore)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 371 2245 M -0.187 0 (Deposits of the Great Basin, Symposium Proceedings: Geological Society of Nevada, Reno,)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 371 2304 M 0.177 0 (NV, p. 739-758.)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 2413 M -0.048 0 (Hoover, D.B., Pierce, H.A., and Abrams, G.A., 1984, Telluric traverse data release for the)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 371 2472 M -0.221 0 (Getchell and Preble disseminated gold deposits, Humboldt County, Nevada: U.S. Geological)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 371 2531 M -0.072 0 (Survey Open-File Report 84-846, 16 p.)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 2640 M -0.063 0 (Hoover, D.B., Pierce, H.A., and Merkel, D.C., 1986, Telluric traverse and self potential data)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 371 2699 M -0.295 0 (release in the vicinity of the Pinson mine, Humboldt County, Nevada: U.S. Geological Survey)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 371 2758 M 0.007 0 (Open-File report 86-341, 26 p.)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 2867 M -0.159 0 (International Association of Geodesy, 1971, Geodetic Reference System, 1967: International)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 371 2926 M -0.184 0 (Association of Geodesy Special Publication No. 3, 116 p.)A ; LH pagesave restore (%%[ Page: 11 ]%%) = %%PageTrailer %%Page: 12 12 %%BeginPageSetup [{ %%BeginFeature: *VMOption Standard %%EndFeature } stopped cleartomark [{ } stopped cleartomark [{ %%BeginFeature: *InputSlot AutoSelect Tray %%EndFeature } stopped cleartomark [{ %%BeginFeature: *Duplex %%EndFeature } stopped cleartomark userdict begin /pagesave save def end mysetup concat colspRefresh : 1.000 1.000 1.000 sco 0 0 2550 3300 rf ; %%EndPageSetup : 1183 3041 175 109 rc 0 0 0 sco %%IncludeFont: Times-Roman (F0) cvn 0.900 (Times-Roman) cvn /Type1 T (Times-Roman) cvn mF (F0_50) cvn F0 50 xF F0_50 Ji 1333 3043 M (8)S ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 302 M -0.158 0 (International Association of Geodesy, 1974, The International Gravity Standardization net 1971:)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 371 361 M -0.190 0 (International Association of Geodesy Special Publication No. 4, 194 p.)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 470 M -0.184 0 (Olivier, R. J., and R. G. Simard, 1981, Improvement of the conic prism model for terrain)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 371 529 M 0.013 0 (correction in rugged topography: Geophysics, v. 46, no. 7, p. 1054-1056.)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 638 M -0.104 0 (Pierce, H.A., and Hoover, D.B., 1991, Airborne electromagnetic applications - mapping structure)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 371 697 M -0.212 0 (and electrical boundaries beneath cover along the Getchell trend, Nevada, in Raines, G.L.,)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 371 756 M -0.116 0 (Lisle, R.E., Schafer, R.W., and Wilkinson, W.H., eds., Geology and Ore Deposits of the great)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 371 815 M -0.168 0 (Basin, Symposium Proceedings: Geological Society of Nevada, Reno, NV, p. 771-780.)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 924 M -0.127 0 (Pitkin, J.A., 1991, Radioelement data of the Getchell trend, Humboldt County, Nevada -)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 371 983 M -0.372 0 (Geological discussion and possible significance for gold exploration, in Raines, G.L., Lisle,)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 371 1042 M -0.080 0 (R.E., Schafer, R.W., and Wilkinson, W.H., eds., Geology and Ore Deposits of the Great)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 371 1101 M -0.168 0 (Basin, Symposium Proceedings: Geological Society of Nevada, Reno, NV, p. 759-770.)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1210 M -0.188 0 (Plouff, Donald, 1977, Preliminary documentation for a FORTRAN program to compute gravity)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 371 1269 M -0.099 0 (terrain corrections based on topography digitized on a geographic grid: U. S. Geological)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 371 1328 M -0.072 0 (Survey Open-File Report 77-535, 43 p.)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1437 M -0.046 0 (Wojniak, W.S., and Hoover, D.B., 1991, The Getchell gold trend, northwestern Nevada\227)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 371 1496 M -0.166 0 (geologic structure delineated by further processing of electromagnetic data collected during a)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 371 1555 M -0.155 0 (helicopter survey: U.S. Geological Survey Circular 1062, p. 77.)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 296 1664 M -0.098 0 (Wojniak, W.S., Hoover, D.B., and Grauch, V.J.S., 1994, Electromagnetic survey maps showing)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 371 1723 M -0.134 0 (apparent resistivities of the Getchell gold trend, Osgood Mountains, north-central Nevada:)A ; : 0 0 2546 3295 rc 0 0 0 sco F0_50 Ji 371 1782 M -0.156 0 (U.S. Geological Survey Geophysical Map GP-1003-A, 3 plates, scale 1:100,000.)A ; LH pagesave restore (%%[ Page: 12 ]%%) = %%PageTrailer %%Trailer %%DocumentNeededFonts: Times-Roman %%+ Times-Italic %%DocumentSuppliedFonts: Pscript_Win_Driver_Incr dup /terminate get exec savelevel0 restore %%Pages: 12 (%%[ LastPage ]%%) = %%EOF