DE BEERS GAHCHO KUÉ MINE ROCK WORKSHOP Tree of Peace, Yellowknife 8:30-4:30 December 13, 2017
MINE ROCK WORKSHOP AGENDA Time Item 8:45 Welcome and Introductions 9:00 Updated Project Description 2018 10:00 Break 10:30 Mine Schedule & Water Management 11:30 Summary of Changes 12:00 Lunch 1:00 Air Quality & Wildlife 1:30 Water & Aquatic Life 2:30 Break 3:00 Water & Aquatic Life, Offsetting 3:45 Summary & Regulatory Process 4:30 Adjourn The De Beers Group of Companies 1
REGULATORY HISTORY 2005 Application for a Type A Land Use Permit and Water Licence 2006 Environmental Assessment and Environmental Impact Review 2010 Environmental Impact Statement submitted 2013 Responsible ministers approved the Project 2013 Updated Project Description (screened) 2013 Early Earthworks Land Use Permit 2014 Type A Land Use Permit and Water Licence 2015 Various Inspector approvals for mine footprint adjustments 2017 Land Use Permit Amendment #1 for Jet Fuel (screened) 2017 Land Use Permit Amendment #2 for Fine PK Facility (screened) 2018 Water Licence and Land Use Permit Amendment for additional mine rock The De Beers Group of Companies 2
GAHCHO KUÉ MINE • Gahcho Kue is owned by a Joint Venture Partnership - De Beers (51%) - Mountain Province Diamonds (49%) • Located 280 km northeast of Yellowknife, 140 km from Lutsel K’e • Open Pit Mine - 5034 Pit - Hearne Pit - Tuzo Pit • 2 Years of Construction • 11 Years of Operation • 2 Years of Active Closure • 12-20+ Years of Re-filling Kennady Lake The De Beers Group of Companies 3
GAHCHO KUÉ MINE PLAN Fine PK Facility CPK West Mine Rock Pile Tuzo 5034 Hearne South Mine Rock Pile The De Beers Group of Companies 4
2017: YEAR 2 OPERATIONS UPDATE • Construction 2 years completed (2014-2016) • De-watering completed (18.65 Mm 3 /year) • Downstream flow mitigation initiated in 2017 • Operations Year 1 completed • AN Building under construction • Dyke construction continues • Mining in 5034 pit continues ~ 80m deep • Pre-stripping of Hearne Pit scheduled for 2018 • Annual discharge WMP to N11 (3.45 Mm 3 /year) The De Beers Group of Companies 5
PROJECT OJECT PROJECT OJECT DESCRIPTION DESCRIPTION DESCRIPTION DESCRIPTION The De Beers Group of Companies 6
A NEW CHALLENGE – JOINT SETS AT 5034 PIT • 5034 Pit has joint sets on the eastern wall BFA 70° BFA 85° • A jo join int is a break (fracture) of natural origin in the 6m 2m continuity of the rock Planned break-back • A jo join int set set is a family of parallel, evenly spaced joints • When jo join int set ets are blasted, the blast pattern is affected • Rock is not only breaking along vertical blast lines, but Actual break-back also along the joint sets 24m • Issue extends to Tuzo and Hearne • Result is a reduction of the catch benches – leading to a safety issue for our workers below 90° The De Beers Group of Companies 7
BENCH WIDTHS MUST BE PRESERVED FOR SAFETY The De Beers Group of Companies 8
HOW WILL THE PITS CHANGE AS A RESULT? • Pit wall slopes will decrease • Planned case: 41°-50° slopes Worst case: 41° east wall slopes • Pit it 2013 13 2018 18 (Worst Case) e) UPD UPD UPD UPD (ha) (ha) 5034 41 50 Tuzo 43 50 Hearne 24 32 Total 108 132 The De Beers Group of Companies 9
WHERE TO PUT THE EXTRA ROCK? • Planned case = 65 Mt • Worst case = 100 Mt • Alternatives Analysis conducted to examine each potential option • Parameters considered: - Containment within Controlled Area - Minimize footprint on land - Minimize footprint in water - Close to pits - Minimize height increase - Technical feasibility The De Beers Group of Companies 10
WEST MINE ROCK PILE – OPTION A Op Option A Capacity 130 Mt Height Increase 35 m Total Height 135 m Proximity to pits Close Land increase 7.8 ha Water increase 54.9 ha • Additional capacity for underwater PAG storage • Drainage watercourse required at closure The De Beers Group of Companies 11
WEST MINE ROCK PILE – OPTION B Option B Op • Sufficient space for Capacity 130 Mt 130 Mt Height increase 35 m • More impact on land • Close to pits Total height 155 m • Less underwater Proximity to pits Close storage of PAG • Requires 1 drainage Land increase 23.5 ha watercourse to be Water increase constructed at closure 40.4 ha • Close to Controlled Area • Additional capacity for PAG Boundary storage • Odd configuration makes it • Odd configuration difficult for large trucks difficult for large trucks • Drainage watercourse • Pile up to 35m higher required at closure The De Beers Group of Companies 12
MINE ROCK COVERED COARSE PK PILE – OPTION C Option on C Capacity 35 Mt Height Increase 70 m Total Height 100 m Proximity to pits Far Land Footprint 32.4 ha Water Footprint 14.3 ha • Insufficient space The De Beers Group of Companies 13
NEW MINE ROCK PILE IN AREA 6 – OPTION D Option on D Capacity 95 Mt Height Increase 95 m Total Height 95 m Proximity to pits Close Land Footprint 60 ha Water Footprint 24 ha • New mine rock pile • Insufficient space • could not restore natural drainage from E lakes during closure The De Beers Group of Companies 14
OTHER OPTIONS CONSIDERED – AREA 7 Ot Other er Op Opti tions at Ar t Area ea 7 Option 1: South of Area 7 -majority on land Option 2: South of and including Area 7 -cover both land and water • Limited height due to airstrip flight obstacle limitations Option 2 would limit • Kennady Lake reconnection at closure • Both Option 1 and 2 are “No - go” options The De Beers Group of Companies 15
WEST MINE ROCK PILE – FINAL SELECTED AND REFINED OPTION Selecte ted and Refined ed Op Option Capacity 130 Mt Height increase 35 m Total height 135 m Proximity to pits Close Land increase 7.1 ha Water increase 55.4 ha • Options A/B Additional capacity for • underwater PAG storage • Drainage watercourse required at closure The De Beers Group of Companies 16
HOW DOES THIS AFFECT OTHER ASPECTS OF MINE DEVELOPMENT? The De Beers Group of Companies 17
KNOCK-ON EFFECTS Ope peration ional al • Larger west mine rock pile • Increased footprint • Adjustments to planned discharge - Discharge from Water Management Pond to N11 in Year 4 - Discharge from Area 7 to Area 8 periodically • Additional mining equipment and operating hours • Additional camp occupancy - Increased annual camp water intake • 7 months longer life of mine • Adjustments to scheduling Closure re • Longer to refill Kennady Lake at Closure (19 years +) • Watercourse required for closure to reconnect Watershed D to Kennady Lake The De Beers Group of Companies 18
LARGER WEST MINE ROCK PILE DESIGN 2013 2018 Design gn Land (ha) a) Water (ha) a) Total (ha) Height ght (m) m) PAG <420 20.7 .7 masl masl (Mt) t) 2013 41.7 39.6 81.3 100 3.4 2018 48.8 95.0 143.8 135 10.8 The De Beers Group of Companies 19
INCREASED FOOTPRINT 2012 Footprint = 1,235 ha 2013 Footprint = 1,172 ha 2017 Approved Footprint = 1,265 ha 2018 Proposed Footprint = 1,288 ha 2018 LUP Amendment = 23 ha Footprint within the Controlled Area Expansion of Mine Rock Pile managed mostly within the existing footprint The De Beers Group of Companies 20
ADJUSTMENTS TO PLANNED DISCHARGE • Discharge from WMP to N11 in Year 4 - 3.45 Mm 3 / year - Option exits in water license (Part G, item 34) - Amendment application will include an EQC Evaluation report • Discharge from A7 to A8 - 1.1Mm 3 four times during Life of Mine - Described in UPD 2013 - May require adjustment to Water Licence to specify discharge location - Amendment application to propose EQC from A7 to A8 Lake N11 Diffuser The De Beers Group of Companies 21
ADDITIONAL MINING EQUIPMENT AND OPERATING HOURS 2013 13 2018 18 Equip ipment ment Assessm essment ent Assessm essment ent Type pe Hours Hours Haul Trucks 74,391 122,006 Shovels 11,200 24,060 Other 155,970 173,433 Total 241,561 319,499 The De Beers Group of Companies 22
CAMP OCCUPANCY 2013 Updated Project Description anticipated 170 people at site during Operations (372 FTE) 2017 Operations currently requires 334 people at site (due to ongoing construction projects) 2019 Peak Operations planning for 339 people at site (665 FTE) *currently have 389 rooms at site; re-configuring site to create another 41 = 430 rooms Total by Labour Source 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 De Beers Canada Employees 417 482 484 484 484 484 481 438 417 377 314 220 Long Term Contractors 145 143 143 143 143 143 143 139 126 122 112 76 Temporary Contractors 48 38 38 38 38 38 38 38 38 38 38 38 Total 609 663 665 665 665 665 662 615 581 537 464 334 Camp Occupancy 312 338 339 339 339 339 337 315 299 278 240 177 The De Beers Group of Companies 23
INCREASED CAMP WATER INTAKE • W.L. Limit = 27,000 m 3 /year • W.L. Amendment ~36,000 m 3 /year • Increase ~9,000 m 3 The De Beers Group of Companies 24
MINE SCHEDULE ADJUSTMENTS & WATER MANAGEMENT The De Beers Group of Companies 25
OPEN PIT MINING SCHEDULE AND MINE ROCK TONNAGE UPDATE The De Beers Group of Companies 26
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