2021 Cigar Lake Licence Renewal

Total Page:16

File Type:pdf, Size:1020Kb

2021 Cigar Lake Licence Renewal Original CNSC Commission Member Document (CMD) CMD: 21-H2.1 Date Submitted: 05 February 2021 Reference CMDs: N/A Cameco Corporation Public Hearing Scheduled for: 28/29 April 2021 Request for a Licensing Decision: Regarding: Cigar Lake Operation Submitted by: Cameco Corporation Cigar Lake Operation Table of Contents Executive Summary ...................................................................................................... 1 1.0 Introduction ......................................................................................................... 3 1.1 Background ..........................................................................................................3 1.2 Summary of Application .......................................................................................6 2.0 Business Plan ..................................................................................................... 7 2.1 General ................................................................................................................7 3.0 Safety and Control Areas ................................................................................... 9 3.1 General ................................................................................................................9 3.2 Management System ......................................................................................... 10 3.3 Human Performance Management .................................................................... 12 3.4 Operating Performance ...................................................................................... 13 3.5 Safety Analysis .................................................................................................. 16 3.6 Physical Design ................................................................................................. 18 3.7 Fitness for Service ............................................................................................. 21 3.8 Radiation Protection ........................................................................................... 22 3.9 Conventional Health and Safety ......................................................................... 25 3.10 Environmental Protection ................................................................................... 30 3.11 Emergency Management and Fire Protection .................................................... 36 3.12 Waste Management ........................................................................................... 38 3.13 Security .............................................................................................................. 40 3.14 Safeguards and Non-proliferation ...................................................................... 41 3.15 Packaging and Transport ................................................................................... 41 4.0 Other Matters of Regulatory Interest .............................................................. 43 4.1 Indigenous Consultation..................................................................................... 43 4.2 Public Information Program ................................................................................ 43 4.3 Eastern Athabasca Regional Monitoring Program .............................................. 45 4.4 Community Based Environmental Monitoring ..................................................... 46 4.5 Cost Recovery ................................................................................................... 47 4.6 Decommissioning and Financial Guarantees ..................................................... 47 4.7 Other Regulatory Approvals ............................................................................... 47 5.0 Conclusions ...................................................................................................... 49 References ................................................................................................................... 50 CMD: 21-H2.1 i 05 February 2021 Cigar Lake Operation Executive Summary Cameco Corporation (Cameco) was granted renewal of the Canadian Nuclear Safety Commission (CNSC) licence for the Cigar Lake uranium mine (Cigar Lake Operation or Cigar Lake) following public Commission hearings on April 3-4, 2013. The current licence (UML-MINE-CIGAR.00/2021) is valid from July 1, 2013 to June 30, 2021. This Commission Member Document provides a high-level summary of the licensing basis and supports Cameco’s request for a renewal of the Cigar Lake CNSC licence for a 10- year term. The Cigar Lake Operation is the second largest high-grade uranium mine in the world and has been in commercial operation since 2015. During the current licence term, Cigar Lake successfully transitioned through the final stages of commissioning and ramped up to full operational status. Cigar Lake achieved this while consistently implementing our programs and protecting the health and safety of its workers and the public, as well as the environment. The following are some highlights of Cigar Lake’s performance over the current licence term: • External recognition for conventional safety programs on three occasions during the licence term, winning the regional John T. Ryan safety trophy for metal mines in 2018, 2019 and 2020. • Injury statistics have all trended downward. • Low effective doses received by workers. • Measures implemented to reduce treated water loadings to the environment during initial commercial production years. Cameco continues to build understanding and support for Cigar Lake through communications and engagement activities described in the Public Information Program. As part of this effort, there has been a particular emphasis on engagement with the rights- bearing Indigenous communities of the Athabasca Basin that are located in the vicinity of Cigar Lake in accordance with Cameco’s collaboration agreements. Although the three First Nations and four municipalities are the primary audience for Cigar Lake, additional engagement is also focussed on local Métis people, Cameco employees and long-term contractors as well as the general public of the Northern Administrative District of Saskatchewan. Engagement activities during the current licence term focused on providing members of the public with ongoing updates on the site’s future through presentations, including discussion on the surface and underground facilities that were built at Cigar Lake in order to support the transition to commercial production. Engagement events were held in the current licence term for northern Saskatchewan communities in relation to Cigar Lake activities, including efforts specific to this licence renewal. In support of the Public Information Program, Cigar Lake maintains a Public Disclosure Protocol that was developed in accordance with guidance provided by the CNSC. The CMD: 21-H2.1 1 05 February 2021 Cigar Lake Operation Public Disclosure Protocol describes the types of routine and non-routine information that Cameco is committed to providing to target audiences. Key to the transition to commercial production was the ability of Cigar Lake to successfully implement the technology of using large-scale freezing from surface to isolate mine infrastructure and workers from the high-grade ore and the water-saturated Athabasca sandstone. In this regard, Cigar Lake was able to safely commission the Jet Boring System (JBS) units to enable mining of the orebody. Cameco declared that the Cigar Lake Operation had met all criteria necessary to achieve commercial production in May 2015 and has been able to safely produce at or near the nominal annual licensed capacity since that time. In March 2020, Cameco and Orano Canada Inc. (Orano) announced a temporary suspension of production at Cigar Lake as a result of the Coronavirus (COVID-19) pandemic. Cameco’s priority is to protect the health and well-being of our employees, their families, and their communities. The proactive decision to suspend production was made to protect our employees and to help slow down the spread of the COVID-19 pandemic. Cameco developed and implemented exposure control measures for our northern Saskatchewan operations, including Cigar Lake. Cameco safely resumed production at Cigar Lake in September 2020. However, due to increasing risks posed by the pandemic and uncertainty regarding continuous access to qualified operational personnel, Cameco again suspended production at Cigar Lake in December 2020. Cameco believes that Cigar Lake has demonstrated strong performance throughout the current licence term through continuous improvement in our processes. Based on our performance during the current licence period, we have demonstrated that we are qualified to carry on the licensed activities planned for the proposed 10-year licence term and will, in doing so, make the necessary provisions for protecting the health and safety of workers and the public as well as the environment. CMD: 21-H2.1 2 05 February 2021 Cigar Lake Operation 1.0 Introduction 1.1 Background 1.1.1 Location The Cameco Corporation (Cameco) Cigar Lake Operation (Cigar Lake) is a uranium mine in the Athabasca Basin of northern Saskatchewan. It is located approximately 660 km north of Saskatoon at the south end of Waterbury Lake (Figure 1.1-1). The closest communities to Cigar Lake are Hatchet Lake First Nation and the Northern Settlement of Wollaston Lake, which are located about 80 km to the east by air. Cigar Lake is connected by an access road leading to Saskatchewan
Recommended publications
  • Cigar Lake Operation Northern Saskatchewan, Canada National Instrument 43-101 Technical Report
    Cigar Lake Operation Northern Saskatchewan, Canada National Instrument 43-101 Technical Report Effective Date: December 31, 2015 Date of Technical Report: March 29, 2016 PREPARED FOR CAMECO CORPORATION BY: C. SCOTT BISHOP, P. ENG. ALAIN G. MAINVILLE, P. GEO. LESLIE D. YESNIK, P. ENG. Table of Contents 1 SUMMARY ........................................................................................................................................... 1 1.1 Preamble .................................................................................................................................... 1 1.2 Introduction ................................................................................................................................. 2 1.3 Property tenure ........................................................................................................................... 2 1.4 Location and site description ...................................................................................................... 3 1.5 Geology and mineralization ........................................................................................................ 3 1.6 Exploration of Cigar Lake deposit ............................................................................................... 4 1.7 Mineral resources and mineral reserves ..................................................................................... 4 1.8 Mining ........................................................................................................................................
    [Show full text]
  • + 2020 Annual Information Form
    Denison Mines Corp. 2020 Annual Information Form March 26, 2021 ABOUT THIS ANNUAL INFORMATION FORM This annual information form (“AIF”) is dated March 26, Table of Contents 2021. Unless stated otherwise, all of the information in this AIF is stated as at December 31, 2020. About this AIF .................................... 1 About Denison ................................... 6 This AIF has been prepared in accordance with Canadian Developments over the Last Three securities laws and contains information regarding Years ................................................. 8 Denison’s history, business, mineral reserves and The Uranium Industry ........................ 17 resources, the regulatory environment in which Denison Mineral Resources and Reserves 24 does business, the risks that Denison faces and other Mineral Properties ............................. 27 important information for Shareholders. Athabasca Exploration: Sampling, Analysis and Data Verification ........... 102 This AIF incorporates by reference: Denison Operations ........................... 107 Manager of UPC ................................ 111 Denison’s management discussion and analysis (“MD&A”) for the year ended December 31, 2020, Denison Closed Mines Group ........... 112 Environmental, Health, Safety and Denison’s audited consolidated financial Sustainability Matters ........................ 112 statements for the year ended December 31, 2020, Government Regulation .................... 114 Risk Factors ...................................... 120 both of which
    [Show full text]
  • Project Management for Decommissioning of Hope Brook
    Uranium Development & Exploration The Athabasca Basin, Northern Saskatchewan July 2020 | Corporate Update Cautionary Statements & References This presentation and the information contained herein is designed to help you understand management’s current views, and may not be appropriate for other purposes. This presentation contains information relating to other companies and provincial infrastructure, and the plans and availability thereof, derived from third-party publications and reports which Denison believes are reliable but have not been independently verified by the Company. Certain information contained in this presentation constitutes “forward-looking information”, within the meaning of the United States Private Securities Litigation Reform Act of 1995 and similar Canadian legislation concerning the business, operations and financial performance and condition of Denison. Generally, these forward-looking statements can be identified by the use of forward-looking terminology such as “plans”, “expects”, “budget”, “scheduled”, “estimates”, “forecasts”, “intends”, “anticipates”, or “believes”, or the negatives and / or variations of such words and phrases, or state that certain actions, events or results “may”, “could”, “would”, “might” or “will be taken”, “occur”, “be achieved” or “has the potential to”. In particular, this presentation contains forward-looking information pertaining to the results of, and estimates, assumptions and projections provided in, the PFS, including future development methods and plans, market prices, costs
    [Show full text]
  • Uranium in Saskatchewan
    Uranium in Saskatchewan Uranium in Saskatchewan Facts on the Industry for 2017 Attached are fact sheets containing information about the uranium industry in Saskatchewan, prepared by the Saskatchewan Mining Association. These fact sheets identify the companies, operations and projects involved in the uranium industry as well as the industry’s historical economic impact within the province. If you have any questions, please contact the appropriate person listed under Industry Contacts. If it is not clear whom you should contact, please call the media and public relations people listed. Uranium in Saskatchewan Introduction “Uranium in Saskatchewan” is a series of fact sheets produced annually by Saskatchewan’s uranium mining industry. The information contained has been gathered from corporations producing uranium in the province. The fact sheets represent the combined total of all efforts of the companies, their employees and contractors who produce this valuable source of energy used worldwide to generate electricity. Saskatchewan is a world leader in uranium production. The uranium industry provides many jobs and promotes investment and economic development in the province. The Saskatchewan uranium mining industry is one of the top employers of aboriginal people in Canada. The industry provides all of these benefits in an environmentally and socially responsible manner and is held accountable for its performance. Regular internal and external audits on the environment and safety of operations are ongoing and thousands of air, water and vegetation samples are taken annually. These samples demonstrate that the industry is protecting the environment. These fact sheets illustrate the magnitude of this industry and the benefits that accrue to the people of Saskatchewan.
    [Show full text]
  • 2017 Uranium Fact Sheet
    Uranium in Saskatchewan Uranium in Saskatchewan Facts on the Industry for 2017 Attached are fact sheets containing information about the uranium industry in Saskatchewan, prepared by the Saskatchewan Mining Association. These fact sheets identify the companies, operations and projects involved in the uranium industry as well as the industry’s historical economic impact within the province. If you have any questions, please contact the appropriate person listed under Industry Contacts. If it is not clear whom you should contact, please call the media and public relations people listed. Uranium in Saskatchewan Introduction “Uranium in Saskatchewan” is a series of fact sheets produced annually by Saskatchewan’s uranium mining industry. The information contained has been gathered from corporations producing uranium in the province. The fact sheets represent the combined total of all efforts of the companies, their employees and contractors who produce this valuable source of energy used worldwide to generate electricity. Saskatchewan is a world leader in uranium production. The uranium industry provides many jobs and promotes investment and economic development in the province. The Saskatchewan uranium mining industry is one of the top employers of aboriginal people in Canada. The industry provides all of these benefits in an environmentally and socially responsible manner and is held accountable for its performance. Regular internal and external audits on the environment and safety of operations are ongoing and thousands of air, water and vegetation samples are taken annually. These samples demonstrate that the industry is protecting the environment. These fact sheets illustrate the magnitude of this industry and the benefits that accrue to the people of Saskatchewan.
    [Show full text]
  • 2Z Lake Project Athabasca Basin, Saskatchewan
    TSX-V: ISO OTCQX: ISENF IsoEnergy.ca 2Z Lake Project Athabasca Basin, Saskatchewan Whitewater East N Whitewater Fond du Lac ATHABASCA Alberta BASIN Manitoba Fond Du Lac Uranium Deposit Stony Rapids Saskatchewan Saskatoon Regina Black Lake Directors Edge Collins Bay Leigh Curyer, Chairman Larocque East Extension Hurricane Zone Horizon Craig Parry, President and CEO Christopher McFadden Larocque West Richard Patricio Full Moon Trevor Thiele Hawk Geiger Radio Eagle Roughrider Eagle Pt. Management Midwest Lake McClean ATHABASCA BASIN Lake Collins Bay McClean Sue Trend Craig Parry, President and CEO North Thorburn Rabbit Lake Natona Bay Madison Steve Blower, VP Exploration Thorburn Lake Sand Clover Cigar Lake Lake Janine Richardson, CFO Thorburn Tower Trident Keith Bodnarchuk, Corp Dev Manager Carlson Creek West Bear 2Z Lake Andy Carmichael, Senior Geologist Paul Bay 905 Cable Justin Rodko, Project Geologist McArthur River Ranger East Rim Contact Gryphon Milennium IsoEnergy mineral tenure Keith Bodnarchuk, Corp Dev Manager Spruce Phoenix Active or depleted uranium mine Discovery or mineral deposit [email protected] Gemini Evergreen Uranium mill T +1 778 867 2631 Town Key Lake Roads Mine and Mill 40 km IsoEnergy Ltd. The 2Z project is located 30 kilometers southeast of Cigar Lake mine and 11 kilometers 970 – 1055 West Hastings St. southeast of Sand Lake uranium deposit. The project consists of four mineral claims to- Vancouver, BC, Canada V6E 2E9 taling 354 hectares. The vertical depth to the unconformity is 60 to 100 meters. The Wolf
    [Show full text]
  • Denison Mines: 2020 Annual Report
    POWERING PEOPLE, PARTNERSHIPS AND PASSION 2020 Annual Report ANNUAL REPORT FOR THE YEAR ENDED DECEMBER 31, 2020 TABLE OF CONTENTS LETTER TO THE SHAREHOLDERS 2 MANAGEMENT’S DISCUSSION AND ANAYLSIS 3 PERFORMANCE HIGHLIGHTS 3 ABOUT DENISON 4 URANIUM INDUSTRY OVERVIEW 4 RESULTS OF OPERATIONS 9 OUTLOOK FOR 2021 33 ADDITIONAL INFORMATION 35 CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS 49 RESPONSIBILITY FOR FINANCIAL STATEMENTS 51 INDEPENDENT AUDITORS REPORT 52 ANNUAL CONSOLIDATED FINANCIAL STATEMENTS 58 LETTER TO THE SHAREHOLDERS A Year of Significant Project and Company De‐Risking March 23, 2021 Dear Shareholders, Confronted with the varied challenges of the pandemic, Denison’s resilient teams excelled in 2020 and early 2021 – accomplishing a significant de-risking of our flagship Wheeler River project and the Company’s balance sheet. At Wheeler River, our technical team achieved a key milestone, receiving an independent confirmation of ‘Proof of Concept’ for the application of the In-Situ Recovery (‘ISR’) mining method at the high-grade Phoenix deposit. We also completed an important trade-off study leading to the adoption of a freeze ‘wall’ design for containment of the ISR operation at Phoenix – a decision that is expected to be favourable from an environmental standpoint, reduce technical complexity and operational risks, allow for a phased mining approach with lower up-front capital costs, and strengthen project sustainability. With the Environmental Assessment process fully resumed and a $21.8 million budget (Denison’s share $19.4 million) approved and funded for evaluation and environmental assessment work at Wheeler River in 2021, the entire team is now focused on advancing Phoenix through the regulatory and community consultation process to support a future Feasibility Study (“FS”), with the objective of pairing Phoenix, the world’s highest grade undeveloped uranium deposit, with ISR mining, the world’s lowest cost uranium mining method.
    [Show full text]
  • Cameco Extends Production Suspension at Cigar Lake Mine and Withdraws Outlook
    TSX: CCO website: cameco.com NYSE: CCJ currency: Cdn (unless noted) 2121 – 11th Street West, Saskatoon, Saskatchewan, S7M 1J3 Canada Tel: 306-956-6200 Fax: 306-956-6201 Cameco Extends Production Suspension at Cigar Lake Mine and Withdraws Outlook Saskatoon, Saskatchewan, Canada, April 13, 2020 . Cameco (TSX: CCO; NYSE: CCJ) announced today that it is extending the temporary production suspension at the Cigar Lake uranium mine in northern Saskatchewan as the effects of the global COVID-19 pandemic persist. Cameco announced on March 23 that the Cigar Lake operation was being placed in safe care and maintenance mode for four weeks, during which we would assess the status of the situation and determine whether to restart the mine or extend the production suspension. With the impact of COVID-19 continuing to escalate, we have determined that the Cigar Lake workforce will need to remain at its current reduced level for a longer duration. The precautions and restrictions put in place by the federal and provincial governments, the increasing significant concern among leaders in the remote isolated communities of northern Saskatchewan, and the challenges of maintaining the recommended physical distancing at fly-in/fly-out sites with a full workforce were critical factors Cameco considered in reaching this decision. Cameco will therefore keep the facility in safe care and maintenance for an indeterminate period. We will monitor the situation on a continual basis to determine when a safe, sustainable restart is possible. Cigar Lake ore is processed at Orano Canada Inc.’s McClean Lake mill, which is also presently in care and maintenance.
    [Show full text]
  • Cameco Corporation Cameco Corporation
    CMD 21-H6.6 File / dossier : 6.01.07 Date: 2021-08-16 Edocs: 6624597 Oral Presentation Exposé oral Written submission from Mémoire de Cameco Corporation Cameco Corporation In the Matter of the À l’égard de Orano Canada Inc., Orano Canada Inc., McClean Lake Operation Établissement minier de McClean Lake Application for licence amendment Demande de modification de permis pour for the expansion of the JEB Tailings l’agrandissement de l’installation de gestion Management Facility (TMF) at the des résidus (IGR) JEB à l’établissement de McClean Lake Operation McClean Lake Commission Public Hearing Audience publique de la Commission October 4, 2021 4 octobre 2021 Original CNSC Commission Member Document (CMD) Date Submitted: 16 08 2021 Reference CMDs: 2021-H-06 Cameco Corporation Public Hearing Scheduled for: October 4, 2021 McClean Lake Licence Amendment Regarding: Orano Canada Inc McClean Lake Licence Amendment Hearing Submitted by: Cameco Corporation McClean Lake Licence Amendment Hearing Date: October 4, 2021 Page 1 Introduction The McClean Lake mill operated by Orano Canada Inc. (Orano) has processed all uranium ore produced by the Cameco Corporation (Cameco) Cigar Lake mine (Cigar Lake) since production began in 2014. The tailings resulting from the milling of Cigar Lake ore are disposed of in the JEB tailings management facility (TMF) at McClean Lake. Orano is also a joint venture partner in the Cigar Lake operation and the two companies have worked together closely for nearly 40 years to develop the mine, prepare the mill to process the ore and effectively manage safety and environmental aspects of the two operations while engaging local communities.
    [Show full text]
  • Table of Cameco's Incidents
    TABLE OF CAMECO'S INCIDENTS Compiled by Dr Jim Green and Mara Bonacci – Friends of the Earth Australia Last updated: June 2017 Cameco is a uranium mining company based in Canada. This paper is posted at https://wiseinternational.org/nuclear-monitor/842/nuclear-monitor-842-26-april-2017 or: http://tinyurl.com/cameco-2017 "When you put the pieces together, they build a story of really fundamental issues about the competence of the company.'' − Prof. Christopher Barnes, geologist and Canadian Nuclear Safety Commission member, 2003 Date Location Description of Incident Sources 1981−89 Saskatche A total of 153 spills occurred at three uranium mines in Saskatchewan, MediaScan Canada 10/11/89; WISE Nuclear wan Canada from 1981 to 1989. Amoc Mining reported 62 spills, Cameco 48 and Monitor #323/324, 22/12/89 Key Lake 43. The spill totals were requested after Cameco's Rabbit Lake http://scott-ludlam.greensmps.org.au/let-the- mine reported a spill of two million litres of radium- and arsenic- facts-speak contaminated water. 1989 Rabbit In November 1989, around two million litres of radioactive and heavy metal Moody, R, 1992, The Gulliver File : Mines, People Lake, (radium, arsenic and nickel) -bearing fluids burst into Collins creek, which and Land ‒ A Global Battleground. Minewatch Canada itself flows into Wollaston Lake. The seepage occurred from a faulty valve on (London, UK), p.894. a 10 km long pipeline carrying runoff and seepage from the Collins Bay mine: loss of pressure in the pipe was recorded by monitoring equipment but not noticed until 14 hours after the rupture.
    [Show full text]
  • Cameco Suspending Production at Cigar Lake Mine
    TSX: CCO website: cameco.com NYSE: CCJ currency: Cdn (unless noted) 2121 – 11th Street West, Saskatoon, Saskatchewan, S7M 1J3 Canada Tel: 306-956-6200 Fax: 306-956-6201 Cameco Suspending Production at Cigar Lake Mine Saskatoon, Saskatchewan, Canada, March 23, 2020 . Cameco (TSX: CCO; NYSE: CCJ) announced today that it is temporarily suspending production at its Cigar Lake uranium mine in northern Saskatchewan and placing the facility in safe care and maintenance mode due to the threat posed by the Coronavirus (COVID-19) pandemic. There are no confirmed cases of COVID-19 among Cameco’s workforce at the present time. The operation will be ramped down over the coming days and placed into care and maintenance for four weeks. During this time, Cameco will assess the status of the situation and determine whether to restart the mine or extend the care and maintenance period. Cigar Lake ore is processed at Orano Canada Inc.’s McClean Lake mill, also located in northern Saskatchewan. The decision to suspend production at Cameco’s Cigar Lake mine was made in conjunction with Orano to suspend production at their McClean Lake mill. As of March 21, 2020, total packaged production from these operations for 2020 was about 4 million pounds U3O8 (100% basis, Cameco’s share 50%). “We are in unprecedented and challenging times,” said Cameco President and CEO Tim Gitzel. “In the face of great uncertainty, our first priority is to protect the health and well-being of our employees, their families and their communities. Our leadership team took a measured approach and weighed many factors in assessing the situation both globally and locally to make this decision, which takes into account the specific and unique circumstances at Cigar Lake, a remote, isolated fly-in/fly-out northern Saskatchewan operation.” “We are all in this together,” said Orano Canada Inc.
    [Show full text]
  • Unconformity-Associated Uranium Deposits of the Athabasca Basin, Saskatchewan and Alberta C.W
    UNCONFORMITY-ASSOCIATED URANIUM DEPOSITS OF THE ATHABASCA BASIN, SASKATCHEWAN AND ALBERTA C.W. JEFFERSON1, D.J. THOMAS2, S.S. GANDHI1, P. RAMAEKERS3, G. DELANEY4, D. BRISBIN2, C. CUTTS5, D. QUIRT5, P. PORTELLA5, AND R.A. OLSON6 1. Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario K1A 0E8 2. Cameco Corporation, 2121 - 11th Street West, Saskatoon, Saskatchewan S7M 1J3 3. MF Resources, 832 Parkwood Drive SE, Calgary, Alberta T2J 2W7 4. Saskatchewan Industry and Resources, 2101 Scarth Street, Regina, Saskatchewan S4P 3V7 5. AREVA Resources Canada Inc., P.O. Box 9204, 817 - 45th Street W., Saskatoon, Saskatchewan S7K 3X5 6. Alberta Geological Survey, Energy Utilities Board, 4th Floor, Twin Atria, 4999 - 98 Avenue, Edmonton, Alberta T6B 2X3 Corresponding author’s email: [email protected] Abstract This review of the geology, geophysics, and origin of the unconformity-associated uranium deposit type is focused on the Athabasca Basin. Pods, veins, and semimassive replacements of uraninite (var. pitchblende) are located close to unconformities between late Paleo- to Mesoproterozoic conglomeratic sandstone basins and metamorphosed basement rocks. The thin, overall flat-lying, and apparently unmetamorphosed but pervasively altered, mainly fluvial strata include red to pale tan quartzose conglomerate, sandstone, and mudstone. Beneath the basal unconformity, red hematitic and bleached clay-altered regolith grades down through chloritic altered to fresh basement gneiss. The highly meta- morphosed interleaved Archean to Paleoproterozoic granitoid and supracrustal basement gneiss includes graphitic metapelitic that preferentially hosts reactivated shear zones and many deposits. A broad variety of deposit shapes, sizes and compositions ranges from monometallic and generally basement-hosted veins to polymetallic lenses located just above or straddling the unconformity, with variable Ni, Co, As, Pb and traces of Au, Pt, Cu, REEs, and Fe.
    [Show full text]