DE BEERS GAHCHO KU SUMMARY OF AMENDMENT APPLICATION Tree of Peace, - - PowerPoint PPT Presentation

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DE BEERS GAHCHO KU SUMMARY OF AMENDMENT APPLICATION Tree of Peace, - - PowerPoint PPT Presentation

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DE BEERS GAHCHO KU SUMMARY OF AMENDMENT APPLICATION Tree of Peace, Yellowknife 8:30-4:30 May 30-31, 2018 GAHCHO KU MINE Gahcho Kue is owned by a Joint Venture Partnership - De Beers (51%) - Mountain Province Diamonds (49%) Located

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Tree of Peace, Yellowknife 8:30-4:30 May 30-31, 2018

DE BEERS GAHCHO KUÉ SUMMARY OF AMENDMENT APPLICATION

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1 The De Beers Group of Companies

  • 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
  • 11.6 Years of Operation
  • 2 Years of Active Closure
  • 19 years of re-filling Kennady Lake

GAHCHO KUÉ MINE

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SLIDE 3

2 The De Beers Group of Companies

2005 Application for a Type A Land Use Permit and Water Licence 2006 Environmental Assessment and Environmental Impact Review 2010 Environmental Impact Statement submitted 2012 EIS Supplement 2013 Responsible Ministers approved the Project 2013 Updated Project Description 2013 Early Earthworks Land Use Permit 2014 Type A Land Use Permit and Water Licence 2017 Land Use Permit Amendment #1 for Jet Fuel 2017 Land Use Permit Amendment #2 for Fine PK Facility 2018 Water Licence Amendment #1 & Land Use Permit Amendment #3 for Mine Rock 2018 Water Licence Amendment #2 for water use (Bridging amendment)

REGULATORY HISTORY

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SLIDE 4

3 The De Beers Group of Companies

PROJECT OJECT DESCRIPTION DESCRIPTION Gahc hcho ho Kué Mi Mine ne

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4 The De Beers Group of Companies

  • A jo

join int is a break (fracture) of natural origin in the continuity of the rock

  • A jo

join int set set is a family of parallel, evenly spaced joints

  • When jo

join int sets ets are blasted, the blast pattern is affected

  • Rock is not only breaking along vertical blast lines, but

also along the joint sets

  • Result is a reduction of the catch benches – leading to a

safety issue for our workers below

  • 5034 Pit has joint sets on the eastern wall
  • Issue extends to Tuzo and Hearne
  • Necessary to re-design the slope walls to accommodate

the additional break-back

A NEW CHALLENGE – JOINT SETS IN ALL THREE PITS

BFA 85°

90°

BFA 70°

2m 6m 24m

Planned break-back Actual break-back

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SLIDE 6

5 The De Beers Group of Companies

BENCH WIDTHS MUST BE PRESERVED FOR SAFETY

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SLIDE 7

6 The De Beers Group of Companies

HOW WILL THE PITS CHANGE AS A RESULT?

Pit (Worst Case) 2013 3 UPD (ha) a) 2018 8 UPD (ha) a) 5034 41 50 Tuzo 43 50 Hearne 24 32 Total 108 132 Difference 24

  • Pit wall slopes will decrease
  • Planned case: 41-50°
  • Worst case: 41°east wall slopes
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SLIDE 8

7 The De Beers Group of Companies

WHERE TO PUT THE EXTRA ROCK?

  • Planned case = 65 Mt
  • Worst case = 100 Mt
  • Alternatives Analysis conducted to

examine each potential option

  • Parameters considered:
  • Feedback received from Aboriginal

Parties and during previous reviews

  • Containment within Controlled Area
  • Minimize footprint on land
  • Minimize footprint in water
  • Close to pits
  • Minimize height increase
  • Technical feasibility
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SLIDE 9

8 The De Beers Group of Companies

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 Key Features:

  • Footprint remains within

Controlled Boundary

  • Drainage watercourse

required at closure

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SLIDE 10

9 The De Beers Group of Companies

  • Sufficient space for

130 Mt

  • More impact on land
  • Close to pits
  • Less underwater

storage of PAG

  • Requires 1 drainage

watercourse to be constructed at closure

  • Close to Controlled Area

Boundary

  • Odd configuration

difficult for large trucks

  • Pile up to 35m higher

WEST MINE ROCK PILE – OPTION B

Op Option B Capacity 130 Mt Height increase 35 m Total height 155 m Proximity to pits Close Land increase 23.5 ha Water increase 40.4 ha Key Features:

  • Footprint within Controlled

Area Boundary

  • Drainage watercourse

required at closure

  • Odd configuration makes it

difficult for large trucks

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SLIDE 11

10 The De Beers Group of Companies

MINE ROCK COVERED COARSE PK PILE – OPTION C

Option

  • n 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 Key Features:

  • Insufficient space for

material

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11 The De Beers Group of Companies

NEW MINE ROCK PILE IN AREA 6 – OPTION D

Option

  • n D

Capacity 95 Mt Height Increase 95 m Total Height 95 m Proximity to pits Close to Hearne Land Footprint 60 ha Water Footprint 24 ha Key Features:

  • New mine rock pile
  • Insufficient space for

material

  • Permanent removal of Area 6
  • Would require long drainage

connection from E Lakes

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SLIDE 13

12 The De Beers Group of Companies

OTHER OPTIONS CONSIDERED – AREA 7

Are rea 7 Op Opti tion 1 South of Area 7 m mostly on l land nd Key Features

  • Limited height due to

airstrip flight obstacle limitation Area 7 Op Option 2 South of Area 7 c covering g both land and water Key Features

  • Permanent alteration of

Area 7

  • Limit Kennady Lake

reconnection at closure

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SLIDE 14

13 The De Beers Group of Companies

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 Key Features

  • Footprint within

Controlled Boundary

  • Drainage watercourse

required at closure

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14 The De Beers Group of Companies

HOW DOES THIS AFFECT OTHER ASPECTS OF MINE DEVELOPMENT?

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15 The De Beers Group of Companies

Ope peration ional al

  • Larger west mine rock pile
  • Increased footprint
  • Adjustments to planned discharge
  • Discharge from Water Management Pond to N11 for 1 additional year
  • Discharge from Area 7 to Area 8 periodically throughout Operations
  • Additional camp occupancy
  • Increased annual camp water intake
  • Additional mining equipment and operating hours
  • 7 months longer life of mine

Closure re

  • Longer to refill Kennady Lake
  • Watercourse required for closure to reconnect Watershed D to Kennady Lake

UPDATED PROJECT DESCRIPTION

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16 The De Beers Group of Companies

LARGER WEST MINE ROCK PILE DESIGN

Design gn Land d (ha) Water (ha) Total (ha) Height t (m) PAG <420.7 masl masl (Mt) t) 2013 41.7 39.6 81.3 100 3.4 2018 48.8 95.0 143.8 135 10.8 Difference 7.1 55.4 62.5 35 7.4

2013 2018

  • Close to the pits
  • Uses existing disturbance
  • Most footprint in WMP
  • Requires drainage channel

at closure

  • Two ramps incorporated

into design for wildlife access/egress

Drai rainag age e cha hannel el

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17 The De Beers Group of Companies

2013 UPDATED PROJECT DESCRIPTION FOOTPRINT

Year Purpose Area (ha) 2014 2014 UPD 2013 1172

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18 The De Beers Group of Companies

2017 APPROVED FOOTPRINT

Year Purpose Area (ha) 2014 2014 UPD 2013 1172 2015 2015 Dyke L haul road 5 2015 2015 Road to temporary laydown 1 2015 2015 Temporary laydowns 19.25 2014 2014 Airstrip re-alignment 17.5 2017 2017 ROM pad area 12 2017 2017 East pad extension 9 2017 2017 Jet fuel 0.25 2017 2017 FPKC expansion and AN building 30 Total 1266

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19 The De Beers Group of Companies

2018 UPDATED PROJECT DESCRIPTION FOOTPRINT

Year Purpose Area (ha) 2014 2014 UPD 2013 1172 2015 2015 Dyke L haul road 5 2015 2015 Road to temporary laydown 1 2015 2015 Temporary laydowns 19.25 2014 2014 Airstrip re-alignment 17.5 2017 2017 ROM pad area 12 2017 2017 East pad extension 9 2017 2017 Jet fuel 0.25 2017 2017 FPKC expansion and AN building 30 2018 2018 Mine Rock Amendment 26 Total 1292

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20 The De Beers Group of Companies

Dyke e G Dyke e H

WATER MANAGEMENT – OPERATIONS

  • Discharge water from WMP to Lake N11
  • Current W.L. = Annually for 3 years
  • Amendment = Annually for 4 years
  • Pump water from A1 to A8
  • Current W.L. = Annually
  • Pump water from Lake N11 to A8
  • Current W.L. = 3 out of 4 years
  • Pump Water from A7 to A8
  • Amendment = Periodically
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21 The De Beers Group of Companies

  • 1 Additional Year of Discharge to Lake N11 (Year 4)
  • Same annual allotment = 3.45 Mm3/ year
  • Option in water license (Part G, item 34)
  • EQC evaluation report submitted
  • Request annual discharge to carry over anniversary date
  • Discharge planned for Sept.1 to Nov.1

ADDITIONAL YEAR OF DISCHARGE TO LAKE N11 (YEAR4) Lake N11 Diffuser

Pipe Availability

Available Not Available

Water Quality

Adequate Not Adequate

M M A June A J O S N J F D

Available Discharge Period Sept.24

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22 The De Beers Group of Companies

  • Discharge from A7 to A8
  • Secondary source of downstream flow water
  • ~1.55 Mm3 as available during Life of Mine (~4 years)
  • To reduce volume of water reporting to WMP
  • EQC evaluation report submitted
  • Existing W.L. permits 1 year of discharge from WMP to A8
  • No discharge from WMP to A8 occurred to date
  • No discharge from WMP to A8 is planned
  • A7 as contingency storage area
  • WMP water may be temporarily stored in A7
  • WMP water would either be pumped back to the WMP or to a pit
  • If discharge to A8 is required, an EQC evaluation report to be

submitted

DISCHARGE FROM AREA 7 TO AREA 8 (PERIODICALLY)

A8

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23 The De Beers Group of Companies

Characteris risti tic 2013 (Upd pdate ted d Project t Descriptio iption) 2018 2018 (Mine Plan Upd pdate) e) Project ct Schedule ule

  • Construction: 2 years
  • Operations: 11 years
  • Closure (interim): 2 years
  • Closure: 12 to 23+ years
  • Construction: 2 years
  • Operations: 11.6 years
  • Closure (interim): 2 years
  • Closure: 19 + years

Mine sequence Hearne, 5034, and Tuzo 5034, Hearne, and Tuzo Produ duction tion rate 3 Mt of ore per year 3.15 Mt of ore per year Surface ce Disturb rbance e (mine footprin print) t) • Total = 1,172 ha

  • Total = 1,292 ha

Pit depth ths

  • Hearne Pit = 252 m
  • 5034 Pit = 310 m
  • Tuzo Pit = 360 m
  • Hearne Pit = 216 m (up to 252m)
  • 5034 Pit = 286 m (up to 310m)
  • Tuzo Pit = 373 m (up to 373)

Total Amount of Mine Rock Rock

  • 300 Mt
  • 400 Mt

Placement t of Mine Rock Rock

  • West Rock Pile = ~100 Mt
  • South Rock Pile = ~100 Mt
  • Mined-out 5034 Pit = ~85 Mt
  • Mined-out Hearne pit = ~15 Mt
  • West Rock Pile = ~228 Mt
  • South Rock Pile = ~100 Mt
  • Mined-out 5034 Pit = ~72 Mt
  • Mined-out Hearne pit as contingency storage area

Height t of Mine Rock Pile les

  • West Mine Rock Pile = ~100 m
  • South Mine Rock Pile = ~120 m
  • West Mine Rock Pile = ~135 m
  • South Mine Rock Pile = ~120 m

Categories ries of Processed sed Kimberlite berlite (PK)

  • coarse PK (including grits) = 0.25 to 6 mm
  • fine < 0.25 mm
  • No change

Total Amount of PK

  • coarse (plus grits) = 23.4 Mt
  • fine = 10.0 Mt
  • coarse (plus grits) = 23.7 Mt
  • fine = 12.7 Mt
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24 The De Beers Group of Companies

Characteris risti tic 2013 (Upd pdate ted d Project t Descriptio iption) 2018 2018 (Mine Plan Upd pdate) e) Pl Placem emen ent t of Fine e PK PK

  • Fine PKC Facility Area 2
  • Mined-out Hearne Pit
  • No change

Placement of Coarse PK

  • Coarse PK Pile
  • Dyke construction and reclamation
  • Mine Rock Piles
  • Mined-out 5034 and Hearne Pits
  • No Change

Dewatering ering of Kennady dy Lake

  • Water discharge to N11
  • Contingency for winter pumping
  • Dewatering of Kennady Lake completed in 2016
  • Winter discharge conducted

Water Diversio ions

  • De Beers has committed to look for opportunities to

restore Area 7 earlier in the mine plan

  • No Change

Water Management

  • Diversion of water from Lake N11 or other sources

(e.g., WMP, if quality is adequate) to augment Area 8 flow (i.e., downstream flow mitigation

  • Diversion of water from Lake N11 or other sources

(e.g. Area 7 if quality is adequate) to augment Area 8 flow (i.e., downstream flow mitigation) Infra rastr tructur ture

  • Variation in airstrip alignment
  • Designated waste management area
  • Slight variation in fuel storage area
  • Slight variation in the location and alignment of the

AN storage and emulsion plants

  • AN Building
  • Gymnasium
  • Dust extraction facilities
  • Tire shop and cold storage
  • Additional accommodation
  • Jet Fuel storage

Closure

  • De Beers has committed to look for opportunities to

restore Area 7 earlier in the mine plan

  • Refilling of Kennady Lake extended to approximately

12 years

  • No Change
  • Refilling of Kennady Lake extended to approximately

19+ years by using natural runoff and supplemental flows from Lake N11

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25 The De Beers Group of Companies

SUMMARY OF LUP AMENDMENT CHANGES

Topic LUP P Sectio ion LUP P 2005C0032 2014 2014 LUP P 2005C0032 2018 2018 Reference to UPD 2018 Part B Definitions Reference to UPD 2013 Reference to UPD 2018 Fuel storage inspections Part C Item 58 a Examine fuel storage tanks once per day Examine fuel storage tanks once per week month

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26 The De Beers Group of Companies

SUMMARY OF W.L. AMENDMENT CHANGES

W.L.

  • L. Reference

ce W.L.

  • L. 2005L2-0015

0015 2014 2014 W.L.

  • L. 2005L2-0015

0015 2018 2018 Scope and Definitions Part A, Scope and Definitions 1 a) Reference to UPD 2013 Reference to UPD 2018 Definition of Modification Part A, Scope and 2. Definitions Definition excludes ‘expansion’ Definition to not specifically exclude ‘expansion’ SNP Stations to be considered prior to discharge from WMP to Lake N11 Part G: EQC – Lake N11 Item 29 SNP 02 to Inspector prior to discharge SNP 02 to Inspector prior to

  • discharge. Allowance for

consideration of other SNP stations. Carry-over of discharge volume Schedule 3 Part D: Water Use Item 2b Annual discharge volume is 3.45Mm3 Annual discharge volume remains 3.45Mm3 but if it is not completed, it can carry over to the subsequent anniversary year

  • r alternatively water discharge

volumes could be measured on a calendar year

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27 The De Beers Group of Companies

SUMMARY OF W.L. AMENDMENT CHANGES

W.L.

  • L. Reference

ce W.L.

  • L. 2005L2-0015

0015 2014 2014 W.L.

  • L. 2005L2-0015

0015 2018 2018 Water Use for camp Schedule 3 Part D, Item 1. b 27,000 m3 45,000 m3 Source of downstream flow mitigation Scope i.v.) operational discharge of effluent from the Water Management Pond to Lake N11 and Area 8 of Kennady Lake xxii) operational discharge of water from Area 7 to Area 8 EQC for A7 Part G, Item 31 Specific to discharge from WMP to A8 Allowance for discharge from A7 to A8 EQC for Lake N11 Part G, Item 30, 34 Table of values Table of updated values incorporating extended discharge

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THANK-YOU

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29 The De Beers Group of Companies

TOPIC 1 – CAMP WATER USE

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30 The De Beers Group of Companies

CAMP OCCUPANCY HAS INCREASED

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

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) + periodic increases Total Capacity = 430 rooms

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31 The De Beers Group of Companies

INCREASED CAMP WATER INTAKE FROM AREA 8

  • Higher camp occupancy

results in higher water use

  • Construction = 60,000m3/y
  • Operations = 27,000m3/y
  • Anticipate exceeding limit in

August 2018

  • Bridging amendment =

35,000m3/y

  • Permanent amendment =

45,000m3/y

  • Water use is for camp only

GNWT ENR36, 37

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32 The De Beers Group of Companies

TOPIC 2 – SNP CHANGES

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33 The De Beers Group of Companies

  • Water licence requires provision of sample results from SNP-

02 to Inspector prior to discharge

  • SNP-02 is an in-line station that cannot be activated without

pumping

  • Pre-discharge samples are taken from the intake location at

Area 3 (SNP 20)

  • Mixing, particularly in the winter, is somewhat less at the

intake location - it’s a little bay

  • De Beers requested that additional samples from active SNP

stations within the WMP (e.g. SNP 06, SNP 05) are also permissible to provide to Inspector prior to discharge to inform his decision

  • Request is most relevant for winter discharge

GNWT- 2, 3, 4,5, MVLWB-7,-13

SNP STATIONS TO BE CONSIDERED PRIOR TO DISCHARGE TO LAKE N11

01 01 20 01 02 06 05 SNP Stations

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34 The De Beers Group of Companies

  • SNP-04 is an in-line monitoring station
  • SNP-03 is 3 stations located at edge of the mixing zone
  • SNP-03 was located at end of discharge pipe from A7 to A8

during de-watering

  • The operational diffuser will be used for discharge from A7

to A8, necessitating a re-location of SNP-03

  • SNP-04 location would move to in-line in new pipe
  • SNP-03 location would move to end of diffuser, again as 3

stations around the mixing zone GNWT- 2, 3, 4,5, MVLWB-7,-13

SNP STATION LOCATION ADJUSTMENT IN AREA 8

03 04 03 04

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SLIDE 36

THANK-YOU