1. Mine Waste Management Presented 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
Hazardous Materials
Highlights

3. Mine Waste Materials Overburden Soils 1.6 million Waste Rock
Life of Mine Tonnage
Overburden Soils
1.6 million
Waste Rock
12.8 million
Low Grade Ore
Recovery Rejects
0.1 million
Processed Coarse Kimberlite (Coarse PK)
2.1 million
Processed Fine Kimberlite
(Fine PK)
0.4 million

4. Mine Waste Materials JERICHO EKATI Overburden Soils 1.6 million
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 -
Recovery Rejects
0.1 million
Coarse PK
2.1 million
1.3 million
Fine PK
0.4 million
2.6 million

5. Production Rates for Waste Materials
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 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

11. Layout of PKCA

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

13. PKCA Storage Capacity No Ice Entrainment Extensive Ice Entrainment
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
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

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