Mine Waste Management Presented by Cam Scott, SRK Consulting
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Transcript of Mine Waste Management Presented by Cam Scott, SRK Consulting
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Mine Waste Management
Presented by Cam Scott, SRK Consulting
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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
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Material Life of Mine Tonnage
Overburden Soils 1.6 million
Waste Rock 12.8 million
Low Grade Ore 1.6 million
Recovery Rejects 0.1 million
Processed Coarse Kimberlite (Coarse PK)
2.1 million
Processed Fine Kimberlite
(Fine PK)0.4 million
Mine Waste Materials
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Material Life of Mine Tonnage Tonnage in 1 Year (2002)
Overburden Soils 1.6 million 5.5 million
Waste Rock 12.8 million 41.2 million
Low Grade Ore 1.6 million -
Recovery Rejects 0.1 million -
Coarse PK 2.1 million 1.3 million
Fine PK 0.4 million 2.6 million
Mine Waste Materials
JERICHO EKATI
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Production Rates for Waste Materials
Fine PK
Coarse PK
Recovery Rejects
Low Grade Ore
Waste Rock
Overburden Soils
1 2 3 4 5 6 7 8 9 10
Years
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Layout of Waste Dumps and Stockpiles
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Foundation Conditions at Waste Dump/ Stockpile Sites
• Consist of either: Bedrock, or Bedrock with isolated soil deposits
• All sites underlain by permafrost
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Typical Section through Waste Dumps and Stockpiles
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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
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Recovery Rejects Dump 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
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Layout of PKCA
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PKCA Storage Capacity
El. 527: Top of Dams
El. 525: Top of Core
El. 523: Spillway
El. 517
Freeboard
Water
1,410,000 m3
Fine PK
≈ 380,000 m3
No Ice Entrainment
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PKCA Storage Capacity
El. 527: Top of Dams
El. 525: Top of Core
El. 523: Spillway
El. 517
Freeboard
Water
1,410,000 m3
Fine PK
≈ 380,000 m3
Extensive Ice Entrainment
El. 527: Top of Dams
El. 525: Top of Core
El. 523: Spillway
El. 519
Freeboard
Water
1,013,000 m3
Fine PK
≈ 760,000 m3
No Ice Entrainment
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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
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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
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Dam Design – Typical Section
Frozen core
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PKCA Construction
• Conventional ice core dam construction procedures using an experienced contractor
• Mainly waste rock and esker sand
• Winter construction
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Hazardous Materials
• Petroleum• Hazardous Materials• Hazardous Wastes• Ammonium Nitrate Storage
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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