On a proposed plutonic porphyry gold deposit model

Hollister, Victor F.

doi:10.1007/bf01782694

Cited by 15 publications

(8 citation statements)

References 7 publications

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“…In this study, the massive sulfide component is referred to as skarn and sulfides replacement, whereas the intrusive related low sulfidation epithermal gold deposit correspond to our vein‐controlled mineralization type. But the textures, styles of mineralization, alteration patterns, mineralogical association, geochemical anomalies, and metal distribution, as well as the composition of spatially associated igneous rocks, indicate the vein‐controlled mineralization from Nucleus shares similarities with various classes of magmatic–hydrothermal deposits including: (i) porphyry system (see Seedorff et al , ); (ii) reduced intrusion‐related gold systems (see Hollister, ; McCoy et al , ; Thompson et al , ; Thompson and Newberry, ; Lang & Baker, ; Maloof et al , ; Hart, ) and especially intrusion‐related Au–Bi deposits (cf. Baker et al , ), and; (iii) low sulfidation epithermal quartz–sulfide‐gold ± copper deposits (Corbett, ).…”

Section: Discussionmentioning

confidence: 99%

“…The Nucleus deposit, in the central Dawson Range, west central of Yukon is within the Dawson Range Cu–Au–(Mo) Belt portion of the Tintina Au province that spans from Alaska into the Yukon, NWT, and BC and hosts significant intrusion‐related gold (IRG) deposits (see Hollister, ; Sillitoe & Thompson, ; Thompson et al , ; Lang & Baker, ; Maloof et al , ; Marsh et al , ; Hart, ), such as Fort Knox (proven and probable reserves of 314.669 Mt at 0.43 g/t Au, Kinross Gold Corp, ), Donlin Creek (proven and probable reserves of 504.8 Mt at 2.09 g/t Au, http://www.novagold.com/_resources/donlin_gold), and Pogo (total reserve and resource of 12.332 Mt at 12.5 g/t Au, Sumitomo Metal Mining Co, Ltd., ) in Alaska, and Dublin Gulch (probable reserves of 92 Mt at 0.78 g/t Au, Victoria Gold Corp., May 29, 2015 news release) and Brewery Creek (indicated mineral resources of 14.1 Mt at 1.27 g/t Au, Golden Predator, November 12, 2014, News) in Yukon.…”

Section: Introductionmentioning

confidence: 99%

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The Nucleus Deposit: Superposed Au–Ag–Bi–Cu Mineralization Systems at Freegold Mountain, Yukon, Canada

2016

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In this paper we present titanite U-Pb (both single crystal CA ID-TIMS and in situ LA ICP-MS) data, coupled with ore and gangue mineralogy and geochemical (both lithogeochemistry and microanalysis) data from the Nucleus Au-Ag-Bi-Cu deposit, in the Yukon (Canada) portion of the Tintina Au province. Arsenic-bearing Au-Ag-Bi-Cu mineralization at Nucleus consists of two distinct styles of mineralization including: (i) reduced Au skarn and sulfide replacement; and (ii) a relatively shallow-emplaced (as supported by textures and temperature of formation), vein-controlled mineralization occurring mainly as veins and veinlets of various shapes (sheeted, single, stockworks, and crustiform), breccias, and disseminations. Whereas Au, Bi, and Cu mineralization from skarn is associated with hydrous retrograde alteration phases (actinolite, ferro-actinolite, hastingsite, cannilloite, and hornblende), numerous alteration types are associated with the vein-controlled style of mineralization and these include: biotite, phyllic, argillic, propylitic, carbonate, and quartz (silicification) alterations. The mineralization-alteration processes took place over a wide temperature range that is bracketed between 340 and 568°C, as indicated by chlorite and arsenopyrite geothermometers. The Au-rich Nucleus deposit is characterized by anomalously high content of As and Bi (as much as 1 %), and whereas Au moderately correlates with Bi (r = 0.40) in the skarn mineralization style (where native Au is spatially associated with native Bi and Bi-bearing sulfides), the two elements correlate poorly (r = 0.14) in the vein-controlled type, in which native Bi-and Bi-sulfide-bearing veins are locally observed. Sphalerite from the vein-controlled mineralized type is Fe-rich (9.92-10.54 mol % FeS) indicative of low sulfidation conditions, as well as high temperature, with the latter further supported by arsenopyrite geothermometry (up to 491°C), low Ag content (3-7 wt.%) in Au, and the high gold fineness (926-964). Whereas molybdenite Re-Os ages from quartz-molybdenite veins range from 75.8 to 76.2 ± 0.3 Ma, titanite from the skarn type mineralization recorded CA ID-TIMS and LA ICP-MS U-Pb ages of 182.6 ± 2.4 Ma and 191.0 ± 1.5 Ma, respectively, thus precluding any genetic link between the two spatially associated styles of mineralization from the Nucleus deposit area. The Au-Ag-Bi-Cu Nucleus deposit is therefore regarded as a superposed system in which two mineralization types, without any petrogenetic relationship, overlapped, possibly with remobilization of early-formed mineralization.Notes: TB 504, TB 398, and TB 309 are from vein-controlled mineralization type, and TB 352 is from sulfide replacement. AV, average; 1σ, standard deviation.Nucleus: superposed mineralized system

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Nucleus Deposit: Superposed Au–Ag–Bi–Cu Mineralization Systems at Freegold Mountain, Yukon, Canada

2016

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“…[Deposit models based on Cox and Singer (1986) and Bliss (1992). The plutonic porphyry gold deposit model is based on Hollister (1992). For grade and tonnage data for specific models, refer to Root, Scott, and Selner (1997)] Deposit model Description Major metals…”

Section: Results Of the Assessmentmentioning

confidence: 99%

1998 Assessment of Undiscovered Deposits of Gold, Silver, Copper, Lead, and Zinc in the United States

2000

Circular

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“…IRG deposits are characterized by low sulfide contents, a predominance or arsenopyrite over pyrite, a gold-bismuth-tellurium±tungsten association at deeper levels, and elevated antimony-arsenicmercury ± tin (Baker, 2003) at shallower levels. The "plutonic porphyry gold" model of Hollister (1992) as well as the Fort Knox, Pogo, and Dublin Gulch deposits (Flanigan and others, 2000;Baker, 2003) represent the deeper levels of the IRG system. Previous assessments (U.S. Geological Survey, 2000) referred to some of the shallower deposits, which we include here in the IRG-SIL model as "peraluminous granite porphyry gold" (Bundtzen and Miller, 1997).…”

Section: Rationale For Model Choice and Tract Delineationmentioning

confidence: 99%

Undiscovered locatable mineral resources in the Bay Resource Management Plan Area, Southwestern Alaska: A probabilistic assessment

Schmidt¹,

Light²,

Drew³

et al. 2007

Scientific Investigations Report

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The Bay Resource Management Plan (RMP) area in southwestern Alaska, north and northeast of Bristol Bay contains significant potential for undiscovered locatable mineral resources of base and precious metals, in addition to metallic mineral deposits that are already known. A quantitative probabilistic assessment has identified 24 tracts of land that are permissive for 17 mineral deposit model types likely to be explored for within the next 15 years in this region. Commodities we discuss in this report that have potential to occur in the Bay RMP area are Ag, Au, Cr, Cu, Fe, Hg, Mo, Pb, Sn, W, Zn, and platinum-group elements. Geoscience data for the region are sufficient to make quantitative estimates of the number of undiscovered deposits only for porphyry copper, epithermal vein, copper skarn, iron skarn, hot-spring mercury, placer gold, and placer platinum-deposit models. A description of a group of shallow-to intermediate-level intrusion-related gold deposits is combined with grade and tonnage data from 13 deposits of this type to provide a quantitative estimate of undiscovered deposits of this new type. We estimate that significant resources of Ag, Au, Cu, Fe, Hg, Mo, Pb, and Pt occur in the Bay Resource Management Plan area in these deposit types. At the 10 th percentile probability level, the Bay RMP area is estimated to contain 10,067 metric tons silver, 1,485 metric tons gold, 12.66 million metric tons copper, 560 million metric tons iron, 8,100 metric tons mercury, 500,000 metric tons molybdenum, 150 metric tons lead, and 17 metric tons of platinum in undiscovered deposits of the eight quantified deposit types. At the 90 th percentile probability level, the Bay RMP area is estimated to contain 89 metric tons silver, 14 metric tons gold, 911,215 metric tons copper, 330,000 metric tons iron, 1 metric ton mercury, 8,600 metric tons molybdenum and 1 metric ton platinum in undiscovered deposits of the eight deposit types. Other commodities, which may occur in the Bay RMP area, include Cr, Sn, W, Zn, and other platinum-group elements such as Ir, Os, and Pd. We define 13 permissive tracts for 9 additional deposit model types. These are: Besshiand Cyprus, and Kuroko-volcanogenic massive sulfides, hot spring gold, low sulfide gold veins, Mississippi-Valley Pb-Zn, tin greisen, zinc skarn and Alaskan-type zoned ultramafic platinum-group element deposits. Resources in undiscovered deposits of these nine types have not been quantified, and would be in addition to those in known deposits and the undiscovered resources listed above. Additional mineral resources also may occur in the Bay RMP area in deposit types, which were not considered here.

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On a proposed plutonic porphyry gold deposit model

Cited by 15 publications

References 7 publications

The Nucleus Deposit: Superposed Au–Ag–Bi–Cu Mineralization Systems at Freegold Mountain, Yukon, Canada

The Nucleus Deposit: Superposed Au–Ag–Bi–Cu Mineralization Systems at Freegold Mountain, Yukon, Canada

1998 Assessment of Undiscovered Deposits of Gold, Silver, Copper, Lead, and Zinc in the United States

Undiscovered locatable mineral resources in the Bay Resource Management Plan Area, Southwestern Alaska: A probabilistic assessment

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