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• W2946817118 abstract "Research Article| May 16, 2019 Mineralogical Profile of Supergene Sulfide Ore in the Western Copper Area, Morenci Mine, Arizona Benjamin N. Schumer; Benjamin N. Schumer § University of Arizona, Department of Geosciences, 1040 E. 4th Street Tucson, Arizona 85721 USA §Corresponding author e-mail address: ben.schumer@gmail.com Search for other works by this author on: GSW Google Scholar Ralph J. Stegen; Ralph J. Stegen Freeport McMoRan, Inc., 10861 N. Mavinee Dr. Ste. 141, Oro Valley, Arizona 85737 USA Search for other works by this author on: GSW Google Scholar Mark D. Barton; Mark D. Barton University of Arizona, Department of Geosciences 1040 E. 4th Street Tucson, Arizona 85721 USA Search for other works by this author on: GSW Google Scholar J. Brent Hiskey; J. Brent Hiskey University of Arizona, Department of Mining and Geological Engineering 1235 James E. Rogers Way, Tucson, Arizona 85721 USA Search for other works by this author on: GSW Google Scholar Robert T. Downs Robert T. Downs University of Arizona, Department of Geosciences 1040 E. 4th Street Tucson, Arizona 85721 USA Search for other works by this author on: GSW Google Scholar Author and Article Information Benjamin N. Schumer § University of Arizona, Department of Geosciences, 1040 E. 4th Street Tucson, Arizona 85721 USA Ralph J. Stegen Freeport McMoRan, Inc., 10861 N. Mavinee Dr. Ste. 141, Oro Valley, Arizona 85737 USA Mark D. Barton University of Arizona, Department of Geosciences 1040 E. 4th Street Tucson, Arizona 85721 USA J. Brent Hiskey University of Arizona, Department of Mining and Geological Engineering 1235 James E. Rogers Way, Tucson, Arizona 85721 USA Robert T. Downs University of Arizona, Department of Geosciences 1040 E. 4th Street Tucson, Arizona 85721 USA §Corresponding author e-mail address: ben.schumer@gmail.com Publisher: Mineralogical Association of Canada First Online: 16 May 2019 Online Issn: 1499-1276 Print Issn: 0008-4476 © 2019 Mineralogical Association of Canada The Canadian Mineralogist (2019) 57 (3): 391–401. https://doi.org/10.3749/canmin.1800020 Article history First Online: 16 May 2019 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Benjamin N. Schumer, Ralph J. Stegen, Mark D. Barton, J. Brent Hiskey, Robert T. Downs; Mineralogical Profile of Supergene Sulfide Ore in the Western Copper Area, Morenci Mine, Arizona. The Canadian Mineralogist 2019;; 57 (3): 391–401. doi: https://doi.org/10.3749/canmin.1800020 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyThe Canadian Mineralogist Search Advanced Search Abstract The intergrowths and compositions of supergene copper sulfide minerals from drill hole MOR-4511 in the Western Copper area of the Morenci mine, Greenlee County, Arizona, have been examined by reflected light microscopy and electron probe microanalysis (EPMA) to better understand the formation of supergene sulfides with implications for hydrometallurgical processing. The supergene copper sulfides occur in three main textures: partial to complete replacement of chalcopyrite, partial replacement of pyrite, and partial to complete replacement of one another. Compositions of copper sulfides vary widely, but (Cu+Fe):S ratios of 1.80 ± 0.05, 1.92 ± 0.03, and 1.10 ± 0.10 are dominant. No stoichiometric Cu2S was found. At shallower depths in the supergene blanket and near/within faults, high (Cu+Fe):S phases (with ratios of 1.80 ± 0.05 and 1.92 ± 0.03) replacing primary chalcopyrite and pyrite or lower (Cu+Fe):S supergene sulfides are dominant, and near the base of the blanket low (Cu+Fe):S phases (with ratios of 1.10 ± 0.10) replacing primary chalcopyrite or higher (Cu+Fe):S supergene sulfides gradually become more dominant. This indicates high concentration of Fe3+, Fe2+, and Cu2+, necessary to form high (Cu+Fe):S phases, at shallower depths and near sources of unreacted fluid, such as faults. Formation of low (Cu+Fe):S phases directly from chalcopyrite or from high (Cu+Fe):S phases could be controlled by decreased concentrations of iron species and Cu2+ due to reaction with primary chalcopyrite and pyrite as fluids descend or migrate away from faults, reduced access to supergene fluids, and/or lower pyrite-chalcopyrite ratios. The compositional patterns of supergene copper sulfide minerals observed at Morenci are similar to those observed in other supergene enrichment blankets of porphyry copper systems worldwide and are even more similar to compositions seen in leaching experiments of synthetic copper and copper-iron sulfides. You do not have access to this content, please speak to your institutional administrator if you feel you should have access." @default.
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• W2946817118 date "2019-05-14" @default.
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• W2946817118 title "Mineralogical Profile of Supergene Sulfide Ore in the Western Copper Area, Morenci Mine, Arizona" @default.
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