Preliminary report on geology, geochemical exploration, and biogeochemical exploration of the Red Mountain stockwork, Yellow Pine District, Valley County, Idaho

Leonard, B.F.; Erdman, James A.

doi:10.3133/ofr83151

Cited by 3 publications

(5 citation statements)

References 9 publications

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“…The geology of part of the Lick Creek area has been mapped by B. F. Leonard (unpub. mapping) and Leonard and Erdman (1983). Mineral resource evaluation of the east area and that portion of the west area south of 45 N. latitude and east of 116 W. longitude included geologic mapping, and geochemical and geophysical studies, conducted during the CUSMAP study of the Challis 1 x2 quadrangle (Webring and Mabey, 1981;McDanal and others, 1984;Mabey and Webring, 1985).…”

Section: Mineral and Energy Resource Potentialmentioning

confidence: 99%

Mineral resource potential of National Forest RARE II and wilderness areas in Idaho

Nevins¹,

Oakman²

1988

Open-File Report

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Section: Mineral and Energy Resource Potentialmentioning

confidence: 99%

Mineral resource potential of National Forest RARE II and wilderness areas in Idaho

Nevins¹,

Oakman²

1988

Open-File Report

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“…Most of the clay minerals in soil developed in bedrock reflect the hypogene alteration of the parent bedrock. The clay minerals in soil (Leonard and Erdman, 1983) Leonard and Martin, 1982. ) are crudely central to the stockwork, and the montmorillonite and chlorite zones are peripheral.…”

Section: Vegetation and Soilsmentioning

confidence: 99%

“…Because contacts of the rock units are concealed at the surface by colluvium or, locally, by Quaternary debris, Leonard mapped the contacts by float. Details of the geology and ore minerals observed at Red Mountain are given in Leonard and Erdman (1983). For the purpose of this report the geology (fig.…”

Section: Geologymentioning

confidence: 99%

“…Details of the packborne magnetometer survey and of the specific anomalies are described in Leonard and Erdman (1983). Collectively the magnetic anomalies of the Red Mountain area show the categorical features of an oval (fig.…”

Section: Tungsten Distributionmentioning

confidence: 99%

“…The purpose of this report is to present the results of biogeochemical studies that were conducted in 1980-1981 in an attempt to better assess the mineral potential of the stockwork area. Parts of this paper have been taken from the open-file report by Leonard and Erdman (1983).…”

Section: Introductionmentioning

confidence: 99%

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A case for plants in exploration: Gold in Douglas-fir at the Red Mountain stockwork, Yellow Pine district, Idaho

Erdman¹,

Leonard²,

McKown³

1985

Open-File Report

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Evidence from this study indicates the presence of exploration targets beyond the Red Mountain stockwork not only for concealed deposits of Au, but also for Mo and W. The targets are new and, to a considerable degree, unexpected from other surface evidence. The biogeochemical anomalies that help define the targets are extensive, and the deposits that might be sought are presumably of low grade.Red Mountain, which lies on the western edge of the ring-fracture zone of the Eocene Quartz Creek cauldron, has been prospected for Au and Ag for at least 50 years. A biogeochemical study was conducted in 1980-81 in an attempt to better assess the mineral potential of the stockwork area. Bedrock contacts are concealed by colluvium, glacial deposits, and forest cover. Soil and plant samples were collected on 200 yd centers over an area of 3600 ft x 8400 ft. The wood of douglas-fir (Pseudotsuga menziesii) and the leaves of beargrass (Xerophyllum tenax) were used because they concentrate Au and Mo, respectively. Results of the soil sampling were insignificant, although they did indicate a W anomaly south of the stockwork. Analysis of ashed wood by instrumental neutron activation yielded Au values of 0.07-14.2 ppm and revealed two distinct Au populations. More importantly, the highly anomalous samples (>4 ppm) are concentrated in the southern quarter of the grid in an area that has no anomalous Au in the sampled soils, has not been prospected for Au, and lies within inclusion-bearing granodiorite, not stockwork. Beargrass samples, which typically contain 20 ppm Mo, contained <5 to >500 ppm. A belt of above-median values of Mo transects some part of every map unit except the quartz body at the summit of Red Mountain. The great extent and the continuity of this belt require some comparably extensive bedrock source of the Mo. The location, shape, and Mo content of the bedrock source remain conjectural, but the source must be large. Subsequent geomagnetic traverses confirmed the belt configuration.

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Memorial of Benjamin F. Leonard III, 1921-2008

Kile

Evans

2009

American Mineralogist

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Preliminary report on geology, geochemical exploration, and biogeochemical exploration of the Red Mountain stockwork, Yellow Pine District, Valley County, Idaho

Cited by 3 publications

References 9 publications

Mineral resource potential of National Forest RARE II and wilderness areas in Idaho

Mineral resource potential of National Forest RARE II and wilderness areas in Idaho

A case for plants in exploration: Gold in Douglas-fir at the Red Mountain stockwork, Yellow Pine district, Idaho

Memorial of Benjamin F. Leonard III, 1921-2008

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