Toronto Geological Discussion Group



Upcoming events

    • 04 May 2016
    • 4:00 PM - 5:00 PM
    • 2nd Floor, 20 Toronto St
    • 57

    Integrating multiple lines of evidence to define the exploration target range for the Castelo de Sonhos Paleo-placer gold Project in Brazil

    Castelo de Sonhos, a gold deposit in Pará State, Brazil, has seen several phases of exploration since the mid-1990s. These programs have provided drill hole data, surface mapping of outcrops, geophysical surveys, geochemical surveys of soil samples and preliminary metallurgical test work. But 20 years after the deposit was first drilled, its resource potential was still not well quantified. The first 43-101 resource estimate created the impression that the project had only a modest resource potential … unfortunate for a deposit where the drilling has not yet encountered the edge of mineralization in any direction, and where only 25% of the strike length of the mineralized unit, a conglomeratic band, has been drilled.

    This year, a new approach has been taken to quantifying the project’s risk and its potential. All available data from the exploration programs have been integrated with recent advances in paleo plate reconstructions, in modeling fluvio-deltaic systems, in geostatistical simulation, and in data mining. This integration of ideas and methods from the petroleum industry, from geostatistics, from classical statistics and from plate tectonics makes it possible to quantify the exploration target in the manner required by National Instrument 43-101: as a range of possible tonnages and grades. Although preliminary resource estimates for the project had already been reported, defining the exploration target has the benefit of establishing an appropriate understanding of the scale of the project. Not only does this improve scoping studies and preliminary economic assessments, but it also assists in financing a project once regarded as being too small by many mining companies. 

    The talk will discuss the benefits of quantifying the exploration target range. It will present the exploration concept for Castelo de Sonhos, showing how it is well-grounded in data, in field observations and science. After explaining the multiple lines of evidence that contribute to the exploration target, the talk will discuss how this conceptual model is testable through drilling and surface trench sampling, concluding with a discussion of the next phases of exploration.

    Mohan Srivastava, Vice President, TriStar Gold

    R. Mohan (“Mo”) Srivastava is a geologist who knows enough about numbers to be called a geostatistician. He once planned on being a sedimentary geologist in the petroleum industry, but ended up becoming a resource estimation specialist after he broke his leg in a motorcycle accident. For the past 30+ years, he has been regarded as high-risk borrower by banks, who take the view that if you’re self employed then you’re unemployed. He remedied this problem late in 2015 by becoming Vice President for TriStar Gold, the junior mining company that is developing the Castelo de Sonhos project.

    Mo has a B.Sc. in Earth Sciences from MIT, and an M.Sc. in Geostatistics from Stanford University. He is a co-author of the widely-used textbook An Introduction to Applied Geostatistics. In the 32 years since he last had a real job, Mo has provided consulting services to a wide range of mining projects throughout the world. In his consulting work with the petroleum industry, he developed the fluvio-deltaic modeling tools that have now found use in establishing the exploration target range for a hard rock gold project.

Past events

19 Apr 2016 Mini-Symposium - The Big Bang: Understanding the Magmatic Controls of Mineral Deposits
05 Apr 2016 Alturas – A Recent High Sulphidation Gold Discovery on the El Indio Belt, Chile
18 Feb 2016 Geology and Mineralization of the New Afton alkalic porphyry Cu-Au deposit
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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