Ore deposits of the Antler Peak quadrangle, Humboldt and Lander Counties, Nevada

Roberts, Ralph J.; Arnold, Dieter

doi:10.3133/pp459b

Cited by 17 publications

(22 citation statements)

References 2 publications

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“…data* BeaU963 Crampton, 1916Hewett, 1931Kennedy, 1915Knopf, 1915Lechler and Hsu, 1988Lind and others, 1923Longwell and others, 1965Mudd, 1915Unpub. data1" Blake and others, 1978Nash and Theodore, 1971Page and others, 1978Roberts and Arnold, 1965Sayers and others, 1967Stager, 1977Theodore and Blake, 1975 data Lechler and Hsu, 1988Hewett, 1931Longwell and others, 1965Bancroft, 1910BeaU965 ComwaU, 1966Needham and others, 1950Unpub. data* Johnson, 1973aPage and others, 1978Roberts and Arnold, 1965Stager, 1977Theodore and Roberts, 1971Vanderburg, 1939…”

Section: Carlson and Others 1985mentioning

confidence: 99%

“…data1" Blake and others, 1978Nash and Theodore, 1971Page and others, 1978Roberts and Arnold, 1965Sayers and others, 1967Stager, 1977Theodore and Blake, 1975 data Lechler and Hsu, 1988Hewett, 1931Longwell and others, 1965Bancroft, 1910BeaU965 ComwaU, 1966Needham and others, 1950Unpub. data* Johnson, 1973aPage and others, 1978Roberts and Arnold, 1965Stager, 1977Theodore and Roberts, 1971Vanderburg, 1939Unpub. data Bancroft, 1910Beal, 1965Bow and Loucks, 1991ComwaU, 1966Longwell and others, 1965Needham and others, 1950Unpub.…”

Section: Carlson and Others 1985mentioning

confidence: 99%

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Maps showing platinum-group-element occurrences in the conterminous United States, updated as of 1993

Peterson¹

1994

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PGE below upper 10% of values for chromitite samples (fire assay) 660 ppb Pd, 23 ppb Pt, 48 ppb Rh in sulfide-rich sample (fire assay) 15 ppb Pd in magnetic fraction of panned concentrate sample (fire assay) Unable to find source of analytical data in record indicating $0.12Aon Pt max. in Unverified report of PGE Unverified report of PGE Small byproduct PGE production PGE below upper 10% of values for chromitite samples (fire assay) 450 ppb Pt, 700 ppb fr, 1.8 ppm Ru, 63 ppb Rh in chromitite sample (fire assay) Unverified report of PGE 52.2 ppb Pt, 53.3 ppb Pd max. in average of rock samples (fire assay) PGE below upper 10% of values for chromitite samples (fire assay) 16 ppb Pd in chromitite sample (fire assay) 62

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Section: Carlson and Others 1985mentioning

confidence: 99%

Section: Carlson and Others 1985mentioning

confidence: 99%

Maps showing platinum-group-element occurrences in the conterminous United States, updated as of 1993

Peterson¹

1994

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“…Geology. The geology of the district is well known from extensive work by Roberts and Arnold (1965), by Theodore and Blake (1975), and continued work by Doebrich and Theodore (1996). These thorough studies have unraveled the very complex geology of the district and the relations of many kinds and ages of ore deposits to that geology.…”

Section: Battle Mountain Districtmentioning

confidence: 99%

Hydrogeochemical studies of historical mining areas in the Humboldt River basin and adjacent areas, northern Nevada

Nash¹

2005

Scientific Investigations Report

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Reconnaissance field studies were made at 50 historical mining districts in northern Nevada to determine the actual or potential contamination of surface or ground water by mine drainage water, mine-waste dumps, and mill tailings. The main focus of this report is on mining areas in the central Humboldt River Basin, from approximately Elko to Winnemucca, with coverage of adjacent or analogous mining areas. More than 650 new chemical analyses of mine water, mine waste and tailings, and leachates of those materials are described and interpreted to provide Federal land-management agencies and the public with concepts regarding sources of mining-related contamination and the extent of contamination. The new observations and geochemical data suggest that contamination is not nearly as common or widespread as postulated by some in the popular press. Out of the tens of thousands of small prospects, small mines, and some large mines on public lands, less than 1 SDMS DOCID# 1141048Hydrogeochemical Studies of Historical Mining Areas in the Humboldt River Basin and Adjacent Areas, Northern Nevada percent of the historical sites pose significant threats to water quality, human health, or wildlife habitat.Although there are tens of thousands of small prospects in northern Nevada, these small diggings generally release no more contamination than the same rocks prior to mining. Out of the hundreds of small-to mediumsized mines on public lands, only a few release acidic mine drainage or significant concentrations of metal contaminants. Large historical mines generally are on private property (patented mining claims) and were not sampled in this study, but only a small percentage are known to produce significant contamination. The approach in this investigation was to identify the largest accessible historical mine or mines in a district for observation and sampling and to seek the worst case of likely contamination. Field observations suggest that visible indicators of acidic mine drainage (such as red, iron-rich precipitates) are rare, and field measurements of pH and chemical analyses of several kinds of materials (dump rocks, tailings, surface water) indicate that only a few sites release acid or significant concentrations of metals. The most consistent observation at and near mining areas is neutral to weakly alkaline pH values (6.5 to 8.4) and water compositions attesting to significant amounts of carbonate derived from rocks, alluvium, and caliche-bearing soils. The alkalinity of surface water is sufficient to naturally mitigate local sources of acidic water by mixing; the neutralization processes induce reactions that greatly reduce the concentrations of most metals in the evolved water. There are, however, indications of elevated amounts of arsenic, molybdenum, and selenium that are mobile in weakly alkaline water. There is some risk for these elements to be cumulatively enriched in closed basins over many years, but the magnitude of that risk is beyond the scope of this investigation.Acidic mine water loaded with toxic m...

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“…The ore is primarily associated with a reworking of the contact metamorphic rock by hydrothermal fluids. The ore depositional mechanisms are chiefly copper–gold replacement, supergene copper deposits, lead–zinc–silver replacement and silver, gold, antimony and lead–zinc veins (Roberts 1965).…”

Section: Applicationsmentioning

confidence: 99%

“…The orogeny was accompanied by the intrusion of quartz monzonite and granodiorite stocks, dykes and sills. The intrusives induced extensive metamorphism in the surrounding country rock, with some aureoles extending up to 3.0 km (Roberts 1965). The Battle Mountain area contains a number of ore deposits, many of which are mined today.…”

Section: The Battle Mountain Magnetotelluric Experimentsmentioning

confidence: 99%

An algebraic formulation of geophysical inverse problems

Vasco

2000

Geophysical Journal International

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Many geophysical inverse problems derive from governing partial differential equations with unknown coefficients. Alternatively, inverse problems often arise from integral equations associated with a Green’s function solution to a governing differential equation. In their discrete form such equations reduce to systems of polynomial equations, known as algebraic equations. Using techniques from computational algebra one can address questions of the existence of solutions to such equations as well as the uniqueness of the solutions. The techniques are enumerative and exhaustive, requiring a finite number of computer operations. For example, calculating a bound to the total number of solutions reduces to computing the dimension of a linear vector space. The solution set itself may be constructed through the solution of an eigenvalue problem. The techniques are applied to a set of synthetic magnetotelluric values generated by conductivity variations within a layer. We find that the estimation of the conductivity and the electric field in the subsurface, based upon single‐frequency magnetotelluric field values, is equivalent to a linear inverse problem. The techniques are also illustrated by an application to a magnetotelluric data set gathered at Battle Mountain, Nevada. Surface observations of the electric (Ey) and magnetic (Hx) fields are used to construct a model of subsurface electrical structure. Using techniques for algebraic equations it is shown that solutions exist, and that the set of solutions is finite. The total number of solutions is bounded above at 134 217 728. A numerical solution of the algebraic equations generates a conductivity structure in accordance with the current geological model for the area.

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Ore deposits of the Antler Peak quadrangle, Humboldt and Lander Counties, Nevada

Cited by 17 publications

References 2 publications

Maps showing platinum-group-element occurrences in the conterminous United States, updated as of 1993

Maps showing platinum-group-element occurrences in the conterminous United States, updated as of 1993

Hydrogeochemical studies of historical mining areas in the Humboldt River basin and adjacent areas, northern Nevada

An algebraic formulation of geophysical inverse problems

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