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Mine Waste Management Presented by Cam Scott, SRK Consulting

Mine Waste Management Presented by Cam Scott, SRK Consulting. Content of Mine Waste Management Presentation. Overview of mine waste materials Waste dumps and stockpiles Layout adjustments Foundation conditions Design section Construction methodology PKCA

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Mine Waste Management Presented by Cam Scott, SRK Consulting

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  1. Mine Waste ManagementPresented by Cam Scott, SRK Consulting

  2. Content of Mine Waste Management Presentation • Overview of mine waste materials • Waste dumps and stockpiles • Layout adjustments • Foundation conditions • Design section • Construction methodology • PKCA • Layout & storage capacity • Foundation conditions • Design section • Construction methodology • Hazardous Materials • Highlights

  3. Mine Waste Materials

  4. Mine Waste Materials JERICHO EKATI

  5. Production Rates for Waste Materials 1 2 3 4 5 6 7 8 9 10 Years

  6. Layout of Waste Dumps and Stockpiles

  7. Foundation Conditions at Waste Dump/ Stockpile Sites • Consist of either: • Bedrock, or • Bedrock with isolated soil deposits • All sites underlain by • permafrost

  8. Typical Section through Waste Dumps and Stockpiles

  9. Dump/Stockpile Construction(except Recovery Rejects Dump) • To enhance physical stability: • Organic soils in toe area to be stripped • Material to be end-dumped in layers • Overall slopes to be about 21 degrees • To enhance geochemical stability • A frozen layer to be maintained in the base of the dumps/stockpiles • For the low grade and coarse tailings stockpiles, a layer of coarse, granitic waste rock will provide separation with any organic soils

  10. Recovery RejectsDump Design and Construction • Organic soils to be stripped • Compacted granitic waste rock to be used to develop a uniform base • Stockpile to overlie an HDPE (plastic) liner bedded on either side with esker sand • Overall slopes of about 21 degrees

  11. Layout of PKCA

  12. PKCA Storage Capacity No Ice Entrainment El. 527: Top of Dams El. 525: Top of Core Freeboard El. 523: Spillway Water 1,410,000 m3 El. 517 Fine PK ≈ 380,000 m3

  13. El. 527: Top of Dams El. 527: Top of Dams El. 525: Top of Core Freeboard El. 525: Top of Core Freeboard El. 523: Spillway El. 523: Spillway Water 1,013,000 m3 Water 1,410,000 m3 El. 519 El. 517 Fine PK ≈ 760,000 m3 Fine PK ≈ 380,000 m3 PKCA Storage Capacity No Ice Entrainment Extensive Ice Entrainment

  14. Foundation Conditions at PKCA • Consist of: • Bedrock, or soil overlying bedrock, on the abutments • Glacially deposited boulders/cobbles in a till matrix of silt, sand and gravel in the valley floor • Underlain by a fault • All dam sites are underlain by permafrost that extends well into bedrock

  15. PK Containment (Dam Design) • Facility classification: low consequence category • Containment provided by ice core dams • Dams at PKCA are 9 to 12 m high and the settling pond dam is 6 m high • Allows for significant ice entrainment • Allows for water management and flood storage • Design based on 2,475-year earthquake

  16. Dam Design – Typical Section Frozen core

  17. PKCA Construction • Conventional ice core dam construction procedures using an experienced contractor • Mainly waste rock and esker sand • Winter construction

  18. Hazardous Materials • Petroleum • Hazardous Materials • Hazardous Wastes • Ammonium Nitrate Storage

  19. Mine Waste Management Highlights • Waste dumps and stockpiles • Location of 3 dumps/stockpiles adjusted to stay in one catchment • Dump/stockpiles designed and constructed to enhance physical and geochemical stability • PKCA • Low consequence classification • Adequate storage capacity • Containment provided by the integration of ice core dams with permafrost foundation • Conventional construction methodology • Hazardous Materials • Handled using appropriate methods

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