The Toronto Geological Discussion Group



Upcoming events

    • 09 Sep 2014
    • 4:00 PM - 5:00 PM
    • Twenty Toronto Street, Toronto, ON M5C 2B8
    • 35

    The Discovery of the Goldrush deposit, Cortez Camp, Nevada

    The Goldrush complex is a Carlin-type sedimentary rock-hosted disseminated gold deposit located in the Cortez mining camp on the Battle Mountain-Eureka mineral trend, Nevada, USA. Goldrush is the third giant gold deposit (more than 300mt or 10 Moz gold) discovered in the district after Pipeline and Cortez Hills and brings the total  endowment of the Cortez camp to greater than 50 Moz gold. The discovery was the product of major advances in geologic interpretation and exploration focus in the Cortez district in the early 2000s.

    Stratigraphic studies based on field observations resulted in greater understanding of the carbonate shelf/slope facies host rocks in the district, which in turn led to new concepts of structural controls on mineralization. Remapping of the historic open pits and surface geology of the Cortez Window and relogging of selected drill holes provided additional support for reinterpreted structure and stratigraphy and the construction of new geologic models. Initial drill testing in the Horse Canyon area led to the discovery of the Red Hill system in late 2004 with an intersection of 61m @ 8.2 g/t gold (375m depth). Subsequent drilling in 2006-08 established continuity and expanded mineralization in the Red Hill area. In late 2009, a new discovery hole located around 1.7km south of the original Red Hill area intersected 20.5m @ 30.6 g/t (388m depth).

    This new discovery (Goldrush) together with Red Hill were the objects of a consistent, focused drilling effort coupled with geologic modelling; this program demonstrated that Goldrush was continuous with Red Hill and the entire system was renamed the Goldrush complex. The end of year 2013 resource for the Goldrush complex stands at 75.5 mt @ 4.52 g/t measured and indicated resources for 10 Moz gold, with an additional 39.5 mt @ 4.82 g/t for 5.6 Moz inferred resource. The system remains open in multiple directions and exploration is ongoing.

    Bio: Nathan Eck

    Nathan is a project geologist with Barrick Gold Exploration working on the Goldrush deposit. He graduated with a B.Sc. in geology from University of Wisconsin-Madison in 2008 and a M.Sc. in geology from University of Nevada-Las Vegas in 2010. Nathan began working with Barrick Gold Exploration in 2010 at the Goldstrike property. He has since worked on a variety of projects exploring for Carlin-type deposits ranging from grassroots exploration to near mine exploration. Last fall he began working with the exploration team on Goldrush, and most recently has been involved in modeling the stratigraphy and structure at Goldrush.

    • 15 Sep 2014
    • 4:00 PM - 5:00 PM
    • Seminar Room 2093, 33 Willcocks Street, Earth Sciences Building, University of Toronto: Salon I
    • 61


    Bio: Neil Williams

    Neil is one of Australia’s leading economic geologists. His distinguished career has spanned all aspects of mineral exploration, both in Australia and internationally, through his work in academia, industry, and government. He was a Research Fellow at the Australian National University and later worked in the mineral exploration industry for ten years, during which time he played a leading role in the Mount Isa Mines group’s exploration programs for gold and base metals.

    Through his industry experience he realised that successful mineral exploration was becoming increasingly reliant on the character and quality of the precompetitive geoscience survey work of government geological surveys. In 1991, he joined the Australian Public Service and has the distinction of being the longest-serving CEO of Australia’s national geological survey and topographic mapping agency, Geoscience Australia, which he directed from 1995 to 2010.

    Neil was President of the Society of Economic Geologists in 2008, and President of the highly successful 34th International Geological Congress held in Brisbane in August 2012.

    Since retiring from Geoscience Australia in 2010 Neil has been mentoring younger geoscientists as an Honorary Professorial Fellow at the University of Wollongong.

    Neil received his undergraduate training in geology at the Australian National University and his PhD in economic geology from Yale University. In the 2006 Australia Day Honours he received the Australian Public Service Medal for outstanding work in the provision of geoscientific advice to government, geoscience services, industry and the public. In 2014 he was awarded the Haddon Forrester King Medal by the Australian Academy of Science for his original and sustained contributions to earth and related sciences, which are vital to the discovery, evaluation and exploitation of mineral deposits, including hydrocarbons.

Past events

13 May 2014 Alexkor and the Richtersveld Land Claim – A retrospective diamond mineral property valuation case study
29 Apr 2014 Advancing Canada's newest gold district: The Borden gold project
09 Apr 2014 Mini-Symposium – Mexico Exploration: Finding the Treasure of the Sierra Madre and more
18 Feb 2014 Geometallurgical Modelling of the Dumont Deposit
04 Feb 2014 The Pistol Bay Gold Project, Nunavut, Canada A new district of Archean gold deposits in a variety of rocks - not just iron formation!
21 Jan 2014 Deep Mining Exploration reveals Ancient Waters of the Precambrian Shield
10 Dec 2013 OSC Staff Notice 43-705: a fair reflection of the mining industry’s recent performance?
21 Nov 2013 Mini-Symposium – Applied Earth Modelling: Better Targeting Using 3D Exploration
05 Nov 2013 The Curraghinalt Orogenic Gold Deposit, Northern Ireland. A Pot of High Grade Gold at the End of the Rainbow
22 Oct 2013 A multidisciplinary approach to the Attawapiskat kimberlite field: accelerating the discovery to production pipeline
01 Oct 2013 Discovery of the Mesel, Batu Hijau, and Elang Deposits, Indonesia: Successful Greenfields Exploration
17 Sep 2013 Exploring and Developing the Hope Bay Project: Approaches Both Old and New
28 May 2013 Do Recent Changes to Ontario’s Mining Act Make the Province a Less Competitive Jurisdiction to Explore?
14 May 2013 Sabodala Gold Mine, Senegal
30 Apr 2013 Key Elements for Mineral Exploration Success: An Example from Neves-Corvo, Portugal
16 Apr 2013 The Rovina Valley Au-Cu Project, Golden Quadrilateral, Romania: New Discoveries in an Old Mining District
02 Apr 2013 Economic geology of black shale – hosted vanadium mineralization in Xiushui County, Jiangxi Province, southeastern China
26 Mar 2013 Mini-Symposium – Laterites or Laterwrongs: Making the Pieces Fit
19 Feb 2013 Anna Fonseca – Infrared Spectroscopy Applied to Alteration Mapping
05 Feb 2013 Joe Hinzer – Challenging Mineral Property Evaluations
22 Jan 2013 Jean-Francois Ravenelle – Geology of the Eleonore Gold Deposit
04 Dec 2012 Jeremy Niemi – The Romero gold discovery, Dominican Republic
08 Nov 2012 Mini-Symposium: The future of mining and exploration in Canada
23 Oct 2012 John Ryder – Paleoplacers – Are Archean/Proterozoic diamondiferous placers/paleoplacers potentially new sources of diamond supply to meet the looming diamond shortage?
09 Oct 2012 Warren Bates – Geology, alteration and Geophysics an the Manfo Gold Project, Sefwi Belt, Ghana
25 Sep 2012 Brent Cook – Exploration vs. Finance and the Low Odds of Success
11 Sep 2012 Hernan Ugalde – Geological Modeling of Geophysical Data: Beyond the 3D inversion black box, v2.0
18 Apr 2012 Hamid Mumin – Iron Oxide Copper-Gold Deposits in Genetic Context
03 Apr 2012 Sally Pehrsson – A new evolution and architecture for the Trans Hudson orogeny and its use in targeting for world class VMS, Nickel and Gold deposits
20 Mar 2012 Jim Mungall – Formation of iron oxide and phosphate tephra of the El Laco volcano, Chile from an Fe-P-O-S magma.
21 Feb 2012 Sergio Cattalani – Discovery and Development of the Canadian Malartic Bulk-Tonnage Gold Deposit, Southern Abitibi, Quebec, Canada.
07 Feb 2012 Workshop and Mini-Symposium on the Complexities of Grade Estimation
24 Jan 2012 Xiaodong Zhou – The Use and Limitations of Aster Satellite Imagery for Exploration

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