Platinum-group elements in porphyry copper deposits: a reconnaissance study

Tarkian, M.; Stribrny, Bernhard

doi:10.1007/bf01161959

Cited by 89 publications

(59 citation statements)

References 24 publications

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“…It is consistent with the abundance of magnetite in all porphyry Cu-Au-Pd deposits of the Balkan Peninsula [14][15][16][17][18][19]. In contrast, "reduced" porphyry Cu-Au deposits, lacking primary hematite, magnetite, and sulphate minerals (anhydrite), contain abundant pyrrhotite, and are relatively Cu-poor, but Au-rich deposits [6].…”

Section: Physico/chemical Conditionssupporting

confidence: 59%

“…The average 890 ppb Au, 40 ppb Pd and 16 ppb Pt contents are higher in ore samples dominated by magnetite, bornite and chalcopyrite, compared to 460 ppb Au, 14 ppb Pd and 4 ppb Pt in samples consisting mainly of chalcopyrite and pyrite [16][17][18][19].…”

Section: Elatsitementioning

confidence: 99%

“…These precious metals belong to the platinum-group elements (Os, Ir, Ru, Rh, Pd and Pt or platinum-group elements (PGEs)), which are the most valuable elements, of strategic importance, due to their growing use in advanced technologies (medicine, electronics) and automobile catalyst converters. Although they are traditionally associated with mafic-ultramafic complexes, significant Pd and Pt contents were described in certain alkaline porphyry deposits, such as the Cordillera of British Columbia (Copper Mountain, Galore Creek), Allard Stock, La Plana Mountains and Copper King Mine in USA [12,13], Skouries porphyry deposit, Greece [14,15], Elatsite, Bulgaria [16][17][18][19], Santo Tomas II in the Philippines [20,21] and elsewhere ( Figure 1). …”

Section: Introductionmentioning

confidence: 99%

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Critical Factors Controlling Pd and Pt Potential in Porphyry Cu–Au Deposits: Evidence from the Balkan Peninsula

Eliopoulos

Economou-Eliopoulos

Zelyaskova-Panayiotova

2014

Geosciences

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Porphyry Cu-Au-Pd±Pt deposits are significant Au resources, but their Pd and Pt potential is still unknown. Elevated Pd, Pt (hundreds of ppb) and Au contents are associated with typical stockwork magnetite-bornite-chalcopyrite assemblages, at the central parts of certain porphyry deposits. Unexpected high grade Cu-(Pd+Pt) (up to 6 ppm) mineralization with high Pd/Pt ratios at the Elatsite porphyry deposit, which is found in a spatial association with the Chelopech epithermal deposit (Bulgaria) and the Skouries porphyry deposit, may have formed during late stages of an evolved hydrothermal system. Estimated Pd, Pt and Au potential for porphyry deposits is consistent with literature model calculations demonstrating the capacity of aqueous vapor and brine to scavenge sufficient quantities of Pt and Pd, and could contribute to the global platinum-group element (PGE) production. Critical requirements controlling potential of porphyry deposits may be from the metals contained in magma (metasomatized asthenospheric mantle wedge as indicated by significant Cr, Co, Ni and Re contents). The Cr content may be an indicator for the mantle input.

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Section: Physico/chemical Conditionssupporting

confidence: 59%

Section: Elatsitementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Critical Factors Controlling Pd and Pt Potential in Porphyry Cu–Au Deposits: Evidence from the Balkan Peninsula

Eliopoulos

Economou-Eliopoulos

Zelyaskova-Panayiotova

2014

Geosciences

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“…In fact, in Cu-(Au-Mo) and porphyry Au deposits, co-mingling of mafic with silicic magma had been reported to increase the Au budget of the deposits (e.g., at Bingham, Keith et al 1998;Tarkian and Stribrny 1999;Hattori and Keith 2001;Maughan et al 2002). Quartz textures also indicate that the dykes from the study area probably cooled rapidly.…”

Section: Implications For Dyke Emplacement and Ore Genesismentioning

confidence: 88%

The nature of “quartz eyes” hosted by dykes associated with Au-Bi-As-Cu, Mo-Cu, and Base-metal-Au-Ag mineral occurrences in the Mountain Freegold region (Dawson Range), Yukon, Canada

Betsi¹,

Lentz

2012

J. Geosci.

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Various origins have been assigned to rounded to subrounded and elliptical quartz megacrysts ("quartz eyes") in dyke rocks associated with mineral deposits/occurrences worldwide. An exact interpretation of their nature is likely to tightly constrain the petrogenesis of the host rocks, and by association may be critical in evaluating genetic models for spatially associated ore minerals. ChromaSEM-CL imaging and electron probe microanalysis (EPMA) of "quartz eyes" within porphyry dykes associated with Au-Bi-Cu-As, Mo-Cu, and base-metal-Au-Ag mineral occurrences across the Northern Freegold Resources (NFR) property in the Dawson Range of Yukon Territory, Canada, reveals that the cathodoluminescence (CL) response of quartz is a function of its trace-element abundance(s). Bright blue luminescent growth zones are in most cases richer in Fe (up to 8839 ppm) and Ti (up to 229 ppm) relative to CL dark growth zones, with up to 41 times lower concentration of these elements. Assuming a TiO 2 = 1, the Ti-poor dull cores consistently recorded lower temperatures (mostly < 600 °C) compared to Ti-rich brighter blue rims (up to 860 °C). This suggests either overgrowth on xenocrystic cores or an increase in crystallization temperature. The temperature rise likely reflects magma mixing, and is therefore consistent with the phenocryst/phenoclasts having formed in a magma chamber rather than by secondary processes. Also, the great variability in composition and temperature of crystallization and/or reequilibration of brighter blue growth zones of two quartz crystals (660 °C and 855 °C) from a single sample suggests that multiple episodes of magma mixing and incremental growth of parental magma chambers occurred. Some "quartz eyes" are overprinted by variably oriented, bifurcating, and anastomosing fluid migration trails ("splatter and cobweb textures") of red to reddish-brown CL quartz that is in most cases of low-temperature origin, and trace-elements poor, thus implying interaction of deuteric fluids with quartz phenocrysts/phenoclasts. The presence of "quartz eye" crystals with broken and angular blue cores, overgrown by oscillatory-zoned rims in which the zoning pattern does not correspond with the crystal boundaries, further suggests that some quartz crystals had been explosively fragmented (phenocrysts) and are now hosted in a recrystallized tuffisitic groundmass. The volatile exsolution that likely accompanied both magma mixing and decompression (as suggested by dendritic quartz, fine-grained recrystallized tuffisitic groundmass, and corroded quartz grains) was probably an important process that could have favoured the ore formation.

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“…K-silicate and sericite alteration are overprinted by advanced argillic alteration (Gilmour and others, 1995). Mineralization consists of chalcopyrite, bornite, and molybdenite with minor sphalerite and tetrahedrite-tennantite (Tarkian and Stribrny, 1999).…”

Section: Kadjaran Porphyry Depositmentioning

confidence: 99%

Porphyry copper assessment of the Tethys region of western and southern Asia: Chapter V in <i>Global mineral resource assessment</i>

Zürcher¹,

Bookstrom²,

Hammarstrom³

et al. 2015

Scientific Investigations Report

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For more information on the USGS-the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment, visit http://www.usgs.gov or call 1-888-ASK-USGS (1-888-275-8747).For an overview of USGS information products, including maps, imagery, and publications, visit http://www.usgs.gov/pubprod.To order this and other USGS information products, visit http://store.usgs.gov.Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.Although this report is in the public domain, permission must be secured from the individual copyright owners to reproduce any copyrighted material contained within this report.Suggested citation: Zürcher, L., Bookstrom A.A., Hammarstrom, J.M., Mars, J.C., Ludington, S., Zientek, M.L., Dunlap, P., and Wallis, J.C., with contributions from Drew, L.J., Sutphin, D.M., Berger, B.R., Herrington, R.J., Billa, M., Kuşcu, I., Moon, C.J. ,and Richards, J.P., 2015, Porphyry copper assessment of the Tethys region of western and southern Asia: U.S. Geological Survey Scientific Investigations Report 2010-5090-V, 232 p., and spatial data, http://dx.doi.org/10.3133/sir20105090V. AbstractA probabilistic mineral resource assessment of undiscovered resources in porphyry copper deposits in the

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Platinum-group elements in porphyry copper deposits: a reconnaissance study

Cited by 89 publications

References 24 publications

Critical Factors Controlling Pd and Pt Potential in Porphyry Cu–Au Deposits: Evidence from the Balkan Peninsula

Critical Factors Controlling Pd and Pt Potential in Porphyry Cu–Au Deposits: Evidence from the Balkan Peninsula

The nature of “quartz eyes” hosted by dykes associated with Au-Bi-As-Cu, Mo-Cu, and Base-metal-Au-Ag mineral occurrences in the Mountain Freegold region (Dawson Range), Yukon, Canada

Porphyry copper assessment of the Tethys region of western and southern Asia: Chapter V in <i>Global mineral resource assessment</i>

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