The Toronto Geological Discussion Group



Upcoming events

    • 14 Sep 2015
    • 4:00 PM - 5:00 PM
    • Twenty Toronto Street, Toronto, ON M5C 2B8
    • 57

    The Arrow Uranium Zone, a Rapidly Emerging Discovery - NexGen Energy Ltd.

    *Note - this talk is on MONDAY September 14 at 4 pm

    The Arrow uranium zone (“Arrow”) was discovered in February 2014 by NexGen Energy Limited (“NexGen”) at its Rook I property in the southwest Athabasca Basin, northern Saskatchewan. A total of 60 diamond drill holes totaling approximately 48,000 m have been drilled into Arrow to date, 58 of these having intersected uranium mineralization. The highest individual geochemical assay of 70.0% U3O8 over 1.0 m in drill hole AR-14-44b continues to confirm the high-grade nature of uranium mineralization at Arrow. Arrow is a basement-hosted, structurally-controlled, and hydrothermally-altered system located within the Patterson Lake Conductive Corridor (“PLCC”). The PLCC constitutes a series of 4 to 5 “discrete” parallel northeast-trending electromagnetic (EM) conductors hosting the: Arrow discovery, Bow discovery, Spitfire discovery (Purpoint/Cameco) and the Triple R Deposit (Fission). Uranium mineralization at Arrow is associated with numerous sub-vertical graphitic mylonitic zones contained within a 635 m strike length, 215 m width, with a depth extent from 100 m below surface to 900 m below surface, and remains open in all directions.

    There are four sedimentary sequences uncomformably overlying the crystalline basement rocks: i) Quaternary glacial tills, ii) Cretaceous sandstone, mudstone and siltstone beds, iii) Devonian sediments of the La Loche Formation, and iv) Helikian-aged Athabasca sandstone of the Manitou Falls “A” member. The basement metamorphic assemblages are part of the Taltson Domain (e.g., East Lloyd Domain). The basement hosting Arrow mineralization is comprised of a major package of variable coarse-grained quartz-rich psammitic to semi-pelitic gneisses and granofels that are occasionally intercalated with relatively narrow graphitic mylonite zones. Uranium has been concentrated locally within the graphitic shears and on either side of the structures in splay offsets. Clay alteration is the most widespread alteration style observed at Arrow and proximal to high-grade mineralization. Hematite alteration is generally limited to a paleoweathering profile intersected immediately at the unconformity and down to approximately 50 m depth, or as local association with uranium mineralization as a part of redox fronts. Late hydraulic structures provide space for multiple dravite alteration events, with intermittent association of remobilized uranium mineralization.

    A variety of mineralization styles occur at Arrow, which include disseminated nodules and flecks, fracture face linings, micro-stockworks, quartz-carbonate-uranium network vein complexes, “worm rock” or redox fronts, and massive to semi-massive veins and pods. The main uranium-bearing mineral present is uraninite, which is frequently partially altered to coffinite. A minor late stage of coffinite also exists.

    Currently there is a 30,000 m drill program on-going on the Rook I property with focus on resource drilling on the Arrow Zone. The resource targeting has been aided by using the Devico Directional Drilling System operated by Tech Directional. The use of Devico has increased pierce point accuracy and the efficiency of drill meters all while minimizing the environmental footprint in achieving multiple pierce points from a single collar.

    The Arrow discovery shines a light on the currently emerging southwest Athabasca Basin while adding to the potential for additional high-grade uranium discoveries to be made along the numerous prospective EM conductive corridors within the southwest Athabasca Basin. 

    Adam Engdahl - NexGen Energy Ltd - Project Manager 

    Adam Engdahl is currently the Project Manager of Saskatchewan for NexGen Energy Ltd. Adam's industry experience began in 2007, and since then, he has worked extensively within Alberta, Saskatchewan, and Newfoundland & Labrador. He completed his undergraduate in Geological and Earth Sciences Geology in 2014. His geology experience ranges from greenfields programs to resource development programs. Adam was a key part of the initial resource and development of the Santoy Gap in 2012 (Claude Resources Inc.). He has worked on a variety of deposit types searching for gold, rare earths (REE), diamonds, platinum group elements (PGE’s) and most recently uranium.

    • 29 Sep 2015
    • 4:00 PM - 5:00 PM
    • Twenty Toronto Street, Toronto, ON M5C 2B8
    • 78

    Roxgold Inc. - Ben Pullinger

    • 20 Oct 2015
    • 4:00 PM - 5:00 PM
    • Twenty Toronto Street, Toronto, ON M5C 2B8
    • 48

    Recent Advances in Ocean Mining - Steve Scott


    Driven by a perceived decline in mineable deposits on land of significant grade, entrepreneurial explorers are moving into the deep sea. Here are known to exist vast deposits of seafloor massive sulfides (copper, zinc, lead, silver, gold), manganese nodules (copper, nickel, cobalt, molybdenum), phosphate (apatite) for fertilizer and iron-manganese crusts on seamounts (cobalt, nickel, PGE). The Australian-based Canadian company Nautilus Minerals is in an advanced stage of preparation for mining their Solwara 1 deposit at 1600 metres water depth in the Bismarck Sea of Papua New Guinea which is expected to begin in the first quarter of 2018. Three robotic mining machines are undergoing testing and a specialized ship is being constructed in China. There is renewed interest and activity in manganese nodules exploration with the entry of private companies, including Nautilus, partnering with Pacific island nations as is required by the International Seabed Authority. Phosphate deposits offshore New Zealand, Mexico and Namibia are being assessed for exploitation. None of these are without solvable environmental issues.


    Steve Scott is an Emeritus Professor of Earth Sciences at the University of Toronto and the Director of its Scotiabank Marine Geology Research Laboratory. He is a geologist /oceanographer specializing in mineral deposits that are forming on the ocean floor. Steve co-discovered with an Australian colleague the Solwara 1 base and precious metal hot spring (“black smoker”) massive sulfide deposit offshore eastern Papua New Guinea that will likely become the first deep-sea mining operation in the world by the Canadian company Nautilus Minerals. Steve holds an honorary degree from France, an honorary professorship from China, is a Fellow of the Royal Society of Canada and has received 8 prestigious awards for his research, the most recent in August 2015 being the Society of Geology Applied to Mineral Deposits’ SGA-Newmont Gold Medal. Although retired, Steve remains active in research and consulting (Marine Mining Consultants). He and his wife, Joan, live in Toronto and on the Brittany seacoast of France.

    • 02 Nov 2015
    • 4:00 PM - 5:00 PM
    • Twenty Toronto Street, Toronto, ON M5C 2B8
    • 79

    TerraX Minerals Inc. - Tom Setterfield

    • 18 Nov 2015
    • 1:00 PM - 6:00 PM
    • Twenty Toronto Street, Toronto, ON M5C 2B8
    • 80

    Mini Symposium - Gold in the Abitibi

    Stay tuned for more info. 

  • RPA

    • 15 Dec 2015
    • 4:00 PM - 5:00 PM
    • Twenty Toronto Street, Toronto, ON M5C 2B8
    • 79

    RPA - Graham Clow

    .... and Christmas Party! 

Past events

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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