Selected geochemical data for the Dillon BLM Resource Area, including the Virginia City mining district, Madison and Beaverhead Counties, southwest Montana : mineral-resource and mineral-environmental considerations
Abstract:Geochemical data on rocks associated with mineral occurrences provide signatures that aid in recognition of the types of mineral deposits that may be present in an area. They also indicate metals, minor elements, or trace elements that may be mobilized from rocks to soils or to waters as rocks are exposed to natural (weathering, landslides) or human-induced (surface disturbance such as road construction or mining) processes. As part of an ongoing study to provide federal land managers with a perspective on the… Show more
“…Sample 96JH67 is a grab sample of a moderately serpentinized, pyroxene-rich ultramafic body mapped by Hadley (1969). Refer to Hammarstrom and Van Gosen (1998) for sample locations, analytical techniques, and complete analyses.…”
Section: Index To Geologic Mappingmentioning
confidence: 99%
“…Most of the prospects (table 1) and the most detailed studies have focused on the ultramafic rocks of the Ruby Range. Geochemical data for mafic and ultramafic rocks in map areas B (Wolf Creek pluton) and F (Virginia City mining district) were sampled for this study (table 2); see Hammarstrom and Van Gosen (1998) for exact sample locations and analytical techniques.…”
Section: Ultramafic Rocks In the Study Areamentioning
confidence: 99%
“…Berg (1995) reported gold (8 ppb or less), platinum (5 ppb), and palladium (all <2 ppb) values for four samples of ultramafic rocks from the Wolf Creek pluton in the area of the Elk Creek vermiculite deposit. Hammarstrom and Van Gosen (1998) reported on the major and trace element chemistry of two pyroxene-rich ultramafic rocks from the same area (table 2) as well as samples of biotite-rich schist and amphibolite that developed at the metasomatic reaction contact that localized the vermiculite deposit. Chromium concentrations are typical (about 2,000 ppm Cr) for ultramafic rocks, but nickel concentrations are relatively low (<1,000 ppm) for ultramafic rocks (Hawkes and Webb, 1962).…”
Section: Southern Ruby Range (Map Area B)mentioning
Prospect or mineral occurrence reporting chromium, nickel, or platinum-group elements-Number indexed to Table 1 belowAreas of exposed Precambrian ultramafic rocks located within the study area "Jake Creek ultramafic body" in the center of the Blacktail Mountains-Described and mapped by
“…Sample 96JH67 is a grab sample of a moderately serpentinized, pyroxene-rich ultramafic body mapped by Hadley (1969). Refer to Hammarstrom and Van Gosen (1998) for sample locations, analytical techniques, and complete analyses.…”
Section: Index To Geologic Mappingmentioning
confidence: 99%
“…Most of the prospects (table 1) and the most detailed studies have focused on the ultramafic rocks of the Ruby Range. Geochemical data for mafic and ultramafic rocks in map areas B (Wolf Creek pluton) and F (Virginia City mining district) were sampled for this study (table 2); see Hammarstrom and Van Gosen (1998) for exact sample locations and analytical techniques.…”
Section: Ultramafic Rocks In the Study Areamentioning
confidence: 99%
“…Berg (1995) reported gold (8 ppb or less), platinum (5 ppb), and palladium (all <2 ppb) values for four samples of ultramafic rocks from the Wolf Creek pluton in the area of the Elk Creek vermiculite deposit. Hammarstrom and Van Gosen (1998) reported on the major and trace element chemistry of two pyroxene-rich ultramafic rocks from the same area (table 2) as well as samples of biotite-rich schist and amphibolite that developed at the metasomatic reaction contact that localized the vermiculite deposit. Chromium concentrations are typical (about 2,000 ppm Cr) for ultramafic rocks, but nickel concentrations are relatively low (<1,000 ppm) for ultramafic rocks (Hawkes and Webb, 1962).…”
Section: Southern Ruby Range (Map Area B)mentioning
Prospect or mineral occurrence reporting chromium, nickel, or platinum-group elements-Number indexed to Table 1 belowAreas of exposed Precambrian ultramafic rocks located within the study area "Jake Creek ultramafic body" in the center of the Blacktail Mountains-Described and mapped by
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