Selected geochemical and petrographic data for characterizing the mineralized rocks of the Montezuma mining district, central Colorado

Neuerburg, George J.; Botinelly, Theodore

doi:10.3133/ofr77425

Cited by 3 publications

(3 citation statements)

References 2 publications

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“…There are small, local intrusions of pegmatite and Eocene quartz monzonite (Levering, 1935). Neuerburg and others (1977) indicate that these are Silver Plume Granite on Mount Edwards and quartz latite biporphyry farther east.…”

mentioning

confidence: 89%

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Locatable mineral reports for Colorado, South Dakota, and Wyoming provided to the U.S. Forest Service in fiscal year 1999

Wilson¹

1999

Open-File Report

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mentioning

confidence: 89%

“…These lands comprise 5118 acres, more or lesr, in Summit County, Colorado. (Wilson and LaRock, 1992) and a high angle east-west trending fault (Neuerburg and others, 1977).…”

mentioning

confidence: 99%

Locatable mineral reports for Colorado, South Dakota, and Wyoming provided to the U.S. Forest Service in fiscal year 1999

Wilson¹

1999

Open-File Report

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“…In the Geneva Creek Basin, streams and tributaries drain Proterozoic-age metamorphic and igneous terrain which has been intruded by Tertiary-age felsic dikes, sills, and stocks. Extensive pyritic alteration and mineralization is associated with the Tertiary intrusives [Levering and Goddard, 1950;Neuerburg et al, 1977]. Mineralization consists mainly of small lead-zinc-silver veins which occur mainly in the upper part of Geneva Creek within the Geneva Creek cirque.…”

Section: Introductionmentioning

confidence: 99%

Simulation of natural acid sulfate weathering in an Alpine Watershed

Bassett¹,

Miller²,

McHugh³

et al. 1992

Water Resources Research

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Streams with acidic sulfate compositions (pH less than 3.5) are naturally generated in the alpine Geneva Creek Basin of the southern Rocky Mountains, an area underlain by Proterozoic metamorphic and igneous rocks that are intruded by Tertiary felsic stocks with associated pyritic alteration. These naturally acidic waters are similar in composition to more familiar man‐made acid mine waters or to surface waters acidified by sulfate precipitation. Detailed study of the stream compositions has revealed the principal reactions driving the weathering process and was used to estimate the relative effects of snowpack ionic input versus the solute contribution from acid attack in soil zones and groundwater. In the Geneva Creek Basin, atmospheric sources of solute represent a minor component to the stream water composition, except for chloride, which can be used to determine the fraction of contribution. The weathering process is a balance between oxidation of sulfides, dissolution of silicates, formation of the clay minerals vermiculite, kaolinite, and smectite, carbonate neutralization, and precipitation of ferric and aluminum oxyhydroxides and aluminum sulfate. The chemical analyses of snow samples, multiple samples of water from Geneva Creek and its tributaries, and the composition of primary and secondary minerals identified in the basin serve as input to a mass balance geochemical model, which facilitates the interpretation of the principal geochemical processes.

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A comparison of rock and soil samples for geochemical mapping of two porphyry-metal systems in Colorado

Neuerburg¹,

Barton²,

Watterson³

et al. 1978

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Paired rock and soil samples were collected at widely spaced locations in large segments of the porphyry-metal systems of the Montezuma district in central Colorado and of a northwestward extension of the Summitville district into Crater Creek in southern Colorado. The paired samples do not covary closely enough for one sample medium to proxy for the other. However, the areal distributions of elements in both rocks and soils in these two districts conform to alteration zoning as defined by mineralogy. Differing geochemical patterns of rocks and soils reflect species-dependent responses to weathering. Soils appear to be statistically enriched in ore elements and depleted in rock elements as compared to the matching rocks. These differences are largely artificial, owing to different methods of sample preparation and chemical analysis for rocks and for soils. The distributions of metals in soils delineate the occurrence of ore-metal minerals, mostly from vein deposits, whereas the distributions of metals in rocks conform to zones of pervasive hydrothermal alteration and to the distribution of varied mineral deposits among these zones. Rock and soil samples are equally useful, of comparable map resoluton, and complement one another as a basis for geochemically mapping these porphyry-metal systems.

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Selected geochemical and petrographic data for characterizing the mineralized rocks of the Montezuma mining district, central Colorado

Cited by 3 publications

References 2 publications

Locatable mineral reports for Colorado, South Dakota, and Wyoming provided to the U.S. Forest Service in fiscal year 1999

Locatable mineral reports for Colorado, South Dakota, and Wyoming provided to the U.S. Forest Service in fiscal year 1999

Simulation of natural acid sulfate weathering in an Alpine Watershed

A comparison of rock and soil samples for geochemical mapping of two porphyry-metal systems in Colorado

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