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Petrology of Gold Ore-Bearing Carbonates of the Helen Zone, Cove Deposit, Lander County, Nevada

Pacanovsky, Aaron James
http://rave.ohiolink.edu/etdc/view?acc_num=akron1398682471

Abstract Details

2014, Master of Science, University of Akron, Geology.
The Helen Zone is located in the McCoy Mining District in the Battle Mountain-Eureka trend 32 miles southwest of the town of Battle Mountain, Nevada. The Helen Zone is a stratabound gold deposit composed of horizontal, bedding-replaced, Carlin-like mineralization in carbonate host rock. The Helen Zone is associated with steeply dipping, structurally controlled, high-grade ore shoots. Major alterations observed in the Helen Zone are hydrothermal decarbonatization of dolostone and decalcification of limestone. These hydrothermal alteration styles are often associated with high-grade gold mineralization. This study is based on the petrology of twenty-five samples that were selected from drill cores and outcrop samples. Samples were analyzed using inductively coupled plasma emission spectroscopy (ICP-ES), petrographic analysis, X-Ray diffraction (XRD), energy dispersive X-Ray analysis (EDAX), and cathodoluminescence (CL). ICP-ES data delineated a chemical trend and significant R2 values identified likely proxy elements for Au. Likely proxy elements for Au in the Helen Zone are: Ag, As, Sb, and Tl. Based on petrographic analysis, the Home Station Member (TRah) of the Helen Zone consists of dolostone, silty dolostone, and siltstone while the Favret Formation (TRfv) of the Helen Zone consists of fossiliferous limestone, limestone, silty limestone, and siltstone. Proxy elements for Au in the Helen Zone can serve as indicators in other areas of the Cove Deposit. The TRfv and TRah have been depicted as mostly limestone and dolostone in previous works, respectively, and detailed petrographic analysis defines a more accurate representation of lithologic compositions within both units.
LaVerne Friberg, Dr. (Advisor)
John Peck, Dr. (Committee Member)
John Szabo, Dr. (Committee Member)
249 p.
Geology; Mineralogy; Mining; Petrology
Cove Deposit; Helen Zone; carbonate gold; Carlin type; Nevada; McCoy Mining District; Home Station Member; Favret Formation

Recommended Citations

Citations

  • Pacanovsky, A. J. (2014). Petrology of Gold Ore-Bearing Carbonates of the Helen Zone, Cove Deposit, Lander County, Nevada [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1398682471

    APA Style (7th edition)

  • Pacanovsky, Aaron. Petrology of Gold Ore-Bearing Carbonates of the Helen Zone, Cove Deposit, Lander County, Nevada. 2014. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1398682471.

    MLA Style (8th edition)

  • Pacanovsky, Aaron. "Petrology of Gold Ore-Bearing Carbonates of the Helen Zone, Cove Deposit, Lander County, Nevada." Master's thesis, University of Akron, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=akron1398682471

    Chicago Manual of Style (17th edition)

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This open access ETD is published by University of Akron and OhioLINK.