The Toronto Geological Discussion Group



Upcoming events

    • 18 Feb 2016
    • 4:00 PM - 5:00 PM
    • 2nd Floor, 20 Toronto St
    • 77

    Geology and Mineralization of the New Afton alkalic porphyry Cu-Au deposit

    Justin Tolman; Manager, Generative Exploration at New Gold

    The New Afton copper-gold mine is located near the city of Kamloops, British Columbia approximately 350 kilometres northeast of Vancouver. It is an underground block cave operation with new concentrator and tailings facilities situated adjacent to the historic Afton open pit which was operated by Teck between 1978 and 1997. As it is currently defined by drilling, the New Afton deposit extends along a southwesterly plunge for approximately 1.5 km from immediately beneath the Afton Mine open pit. Underground mining at New Afton began in June 2012 and the operation achieved commercial production ahead of schedule in July 2012. In 2015 the underground operation produced 105,000 ounces of gold and 86 million pounds of copper.

    The New Afton deposit is part of a larger alkalic copper-gold porphyry district within the Iron Mask batholith complex of the Quesnel Trough island-arc terrane. Regional scale fault zones act as the principal controls to the emplacement of the intrusions and related porphyry-style mineralization in the area. The New Afton deposit itself is localized in an dilatational fault jog, formed during regional sinistral transpression during the early Juassic. Mineralization is characterized by copper sulphide veinlets, clots and disseminations localized at the contact between altered porphyritic monzonites and volcanic country rocks belonging to the Triassic age Nicola Group sequence. Secondary chalcocite and native copper occur in the upper near-surface parts of the deposit, most of which was mined from the historic Afton open pit. Gold occurs as sub-micron grains associated with copper sulphides.

    The current mine schedule plans for production through to the year 2023. Since the start of the commercial production in 2012, exploration at New Afton has successfully extended the mineral resource below the current B-Zone block cave reserve. This work has resulted in the development of the C-Zone mineral resource which is currently the focus of a feasibility study which indicates the potential to add 5 more years to New Afton’s overall mine life. The C-Zone resource remains open to further growth both laterally and down plunge to the west. Site exploration is ongoing.

    Mr. Tolman has over 18 years of experience in the mining and exploration industry across a wide range of commodities and geographies.  Prior to joining New Gold in 2012, Justin worked as General Manager – Chile for Exeter Resources where he oversaw all technical and exploration activities. During this tenure, Exeter developed the 19 million ounce/4 billion pound Caspiche porphyry gold-copper deposit from discovery through to pre-feasibility stage.  Earlier, Justin led the team that discovered the 2.2 million ounce McPhillamy’s gold deposit for Newmont in New South Wales, Australia.
    Justin holds a 1st Class Honors in Applied Science – Economic Geology Major – from James Cook University, and a MBA from La Trobe University, both in Australia.
    Justin and his family will be relocating to Toronto this summer from Denver, Colorado.

Past events

10 Feb 2016 Murray Brook Polymetallic VHMS Deposit, Bathurst, New Brunswick
26 Jan 2016 From Sadiola to the recently discovered Boto Gold Deposit, 25 years of gold mining and exploration discovery in West Africa
15 Dec 2015 Mining Project Development Experience – Where Do Things Go Wrong and Why
18 Nov 2015 Mini-Symposium – Abitibi Gold: The next 135 million ounces
02 Nov 2015 TerraX Minerals Inc.
20 Oct 2015 Recent Advances in Ocean Mining
29 Sep 2015 55 Zone - A new high grade gold mine on the Yaramoko Property, Burkina Faso
14 Sep 2015 The Arrow Uranium Zone, a Rapidly Emerging Discovery - NexGen Energy Ltd.
05 May 2015 Brucejack Project,B.C.
18 Apr 2015 Mini-Symposium – Working Smart: Using the downturn in the economy as an opportunity
31 Mar 2015 The (geochemical) Hitchhikers’ Guide to Magmatic Ni-Cu Prospectivity in a Greenstone Belt
03 Feb 2015 Amaruq: The early days of a significant gold discovery
20 Jan 2015 The Renard Diamond Project: 13 Years From Discovery, Now Under Construction
09 Dec 2014 Facts and Fallacies: a personal commentary on the last 45 years of uranium exploration and development in the Athabasca Basin of northern Saskatchewan.
09 Dec 2014 Exploration for Deep VMS Ore Bodies: The Hudbay Lalor Case Study
19 Nov 2014 Mini-Symposium – Canada's Mineral Landscape: Aboriginal Rights and Related Issues
21 Oct 2014 The Geologic Framework and Potential for Deep Seated Deposits at the Superior Project, Ontario
07 Oct 2014 Hardrock Gold Project, Geraldton, Ontario: Structural and stratigraphic settings of the deposits
23 Sep 2014 Timing and Controls on Gold Mineralization in the Abitibi Greenstone Belt
15 Sep 2014 Deep Mineral Exploration - The Next Economic Geology Frontier
09 Sep 2014 The discovery of the Goldrush deposit, Cortez Camp, Nevada
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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