Dominion Diamonds Lynx Project Wekeezhii Land and Water Board - - PowerPoint PPT Presentation

1_Dominion Diamond Ekati Corporation

Dominion Diamond’s Lynx Project Wek’eezhii Land and Water Board Technical Session Dec 3-4, 2013

2_Dominion Diamond Ekati Corporation

Dominion Diamond is the NWT’s Largest Mining Company

Lorem ipsum

We are a Canadian owned Company

Dominion owns:

Most of the Ekati Diamond Mine (80%) Part of the Diavik Diamond Mine (40%)

Dominion employs more Northerners than any other mining company in the NWT.

3_Dominion Diamond Ekati Corporation

Ekati Diamond Mine

4_Dominion Diamond Ekati Corporation

Location of Lynx Kimberlite Pipe

5_Dominion Diamond Ekati Corporation

Lynx is Part of the Misery Site Activities:

• ~3 km road upgrade
• ~1 km new road
• dewatering and

minewater pipelines

• fish-out and dewatering
• ~1 year mining
• processed kimberlite

deposition

• reclamation

Lynx can provide ~4 months additional kimberlite to the Ekati process plant

6_Dominion Diamond Ekati Corporation

Lynx Waste Rock Management

Extension to Misery WRSA and/or Crushing and use in future projects

7_Dominion Diamond Ekati Corporation

Proposed Lynx Project

Ekati Lynx Project Technical Sessions

WATER MANAGEMENT AND EFFLUENT QUALITY CRITERIA (EQC)

Agenda Topic:

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Ekati Lynx Project Technical Sessions

EQC FOR DEWATERING TO LAC DE GRAS

Agenda Topic:

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EQC for Dewatering to Lac de Gras

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Main Topics of Discussion

• Baseline water quality for Lynx Lake and Lac de Gras
• Summary of additional 2013 sampling conducted in

Lynx Lake

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Water Management and Effluent Quality Criteria

Lynx Lake Baseline Data Hammer Lake Lynx Lake

Water Management and Effluent Quality Criteria

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Lynx Lake Baseline Data

Lynx Lake – looking North

Water Management and Effluent Quality Criteria

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Lynx Lake Baseline Data Sampling in 2013 for the Lynx Project included water and sediment quality, lower trophic levels (plankton, benthic invertebrates), and fish and fish habitat

2013 Aquatic Sampling for the Lynx Project

Location Photos Bathymetry Water Quality Sediment Quality Phytoplankton Zooplankton Benthic Invertebrates Fish Sampling Habitat Assessment Lynx Lake X X X X X X X X X Hammer Lake X X X X X X X X X Lynx Creek X

• X
• X

Hammer Creek X

• X

Lynx Lake Shoreline

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2013 Aquatics Data Collection – Fish and Fish Habitat

Aerial view of Lynx Creek mid reach

Lynx Lake Bathymetry

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2013 Aquatics Data Collection – Fish and Fish Habitat

Lynx Lake Substrate Types

• Considerable historical water quality data available for Lac de Gras
• Diavik has conducted an AEMP for >10 years which includes water chemistry in

Lac de Gras (as reported in the annual AEMP reports for Diavik)

• incorporates results from relevant SNP stations
• encompasses near-field (i.e., near the effluent diffuser), mid-field, and far-

field/reference sampling areas

• includes under-ice and open-water sampling
• results reported annually to the WLWB, and trends are monitored
• Therefore, suitable baseline Lac de Gras water quality exists for the Lynx Project

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Lac de Gras Baseline Water Quality

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Lynx Lake and Lac de Gras Baseline Water Quality

a = based on Diavik samples collected in the open-water period in 2011 (August 7 to 28) and 2012 (August 16 to 23) (Ref: Diavik

Diamond Mine Aquatic Effects Monitoring Program 2011 Annual Report, March 2012; Diavik Diamond Mine Aquatic Effects Monitoring Program 2012 Annual Report, March 2013)

b = preliminary data based on samples collected in the open-water period in 2013 (August and September) c = preliminary data Lakes C-L1 and D-L3 (August 2013) and lakes G-L2 and H-L1 (September 2013)

Lake Lac de Gras (Diavik AEMP)a Lynx Lakeb Small Lakesc Station Area Far Field 1 Far Field 2 all all pH 6.6 - 6.9 6.8 - 7.0 6.4 - 7.3 6.5 - 6.9 hardness (mg CaCO3/L) 5.6 - 5.8 7.1 - 7.4 5.2 - 8.8 3.8 - 6.1 TDS (mg/L) 10 - 16 12 - 16 14 - 23 5 - 21 Aluminum (µg/L) 5.6 - 7.0 4.1 - 7.0 13.7 - 50.3 5.6 - 21.0 Arsenic (µg/L) 0.13 - 0.16 0.19 - 0.26 0.30 - 0.43 0.27 - 0.60 Copper (µg/L) 0.53 - 0.58 0.55 - 0.69 1.26 - 1.80 0.44 - 1.50 Iron (µg/L) 5.0 - 7.0 5.2 - 24.0 53.0 - 274.0 20.0 - 229.0 Manganese (µg/L) 1.48 - 1.54 1.49 - 2.20 8.2 - 62.4 2.6 - 46.0 Molybdenum (µg/L) 0.11 - 0.14 0.43 - 0.56 <0.05 - 0.08 <0.05 - 0.06 Strontium (µg/L) 8.43 - 8.63 14.3 - 15.5 9.2 - 10.1 4.3 - 7.4 Uranium (µg/L) 0.024 - 0.030 0.058 - 0.910 0.032 - 0.044 <0.01 - 0.04 Zinc (µg/L) 0.3 - 0.9 0.2 - 4.4 1.0 - 8.1 0.8 - 3.2

EQC not needed for lake dewatering Monitor TSS

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Lynx Lake Baseline Hydrology

Ekati Lynx Project Technical Sessions

DEWATERING PLAN

Agenda Topic:

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Dewatering Plan

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Main Topics of Discussion

• Information to be provided in the Dewatering Plan
• Timeline for preparing and submitting the

Dewatering Plan

• EQC and Response Framework for dewatering

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Dewatering Plan Requirements

Information requiring WLWB Approval:

• Volume of water to be dewatered from each source
• The expected quality of water to be discharged to the Receiving Environment
• A schedule of dewatering and daily discharge rates
• Pumping methods including locations of intake and outflow structures
• The design of any erosion protection structures in the discharge areas
• The description of procedures for visual inspection of any erosion along the

affected watercourse

• The frequency and locations of water quality monitoring as referred to in the

Surveillance Network Program

• The frequency, location and procedures for monitoring flow rates in the

discharge stream

• The design of the pipeline and related facilities
• The procedures and rates for dewatering during the winter months to minimize

erosion of the downstream watercourses, adjacent shorelines and damage to fish habitat

• The identification of any treatment that may be used to ensure that effluent

quality criteria are met, in accordance with Part G, Item 11(d)

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Lynx Lake Dewatering Plan

• Lac de Gras is the preferred location for dewatering discharge from Lynx Lake
• Only water which contains TSS less than the prescribed limit will be released to

Lac de Gras

• Water that cannot be discharged to Lac de Gras will be incorporated into the

Misery mine water system via Desperation Pond

• A Dewatering Plan will be developed based on previous Plans:
• water quality and erosion monitoring (see proposed SNP station)
• TSS limit for release to Lac de Gras (i.e., action level)
• Other details per the Water Licence
• Per previous, EQC for Dewatering are not required.

Ekati Lynx Project Technical Sessions

DESPERATION POND AND KING POND SETTLING FACILITY

Agenda Topic:

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Desperation Pond and King Pond

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Main Topics of Discussion

• Ekati’s current use of Desperation Pond and King

Pond Settling Facility

• Use of Desperation Pond for the Lynx Project,

including dewatering and mine water management

• Predictions of volumes to discharged to Desperation

Pond

• EQC

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Misery Site Minewater Management

Proposed to also include:

• late stages of Lynx Dewatering
• Lynx pit sump

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King Pond Water Balance

Climatic Condition Precipitation (mm) Net Inflow to KPSF from Natural Catchment and

• n Pond (m3)

aAverage

Pumped Flow from Desperation Pond (m3) Average Pumped Flow from WRDP (m3) Average Pumped Flow from Misery Pit (m3) Total Inflow (m3) Present Layout Average annual precipitation 338 107,000 114,000 55,000 108,000 384,000 Final Layout at End of Misery Expansion Average annual precipitation 338 107,000 33,000 55,000 161,000 356,000 Including Lynx Pit Sump Inflows (Draft) Average annual precipitation 338 107,000 147,915 55,000 161,000 470,915

a Assumes that all flows from Desperation Pond report to the KPSF – worst case in terms of total volume reporting to the KPSF. Increase: ~87,000 m3/yr for 1-2 years

• Storage Capacity of King Pond ~1M m3

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Misery Site EQC (2013 Water Licence Renewal)

2013 Parameters of Interest are inclusive

• f Lynx minewater

Water Quality Parameter King-Cujo POI? Modelled? peak >100% benchmark? peak >75% benchmark? Assessed? peak >100% benchmark? current increasing trend? Potential EQC parameter? Response Framework parameter? ammonia N (total) Y Y Y

• Y
• Y

Y aluminum Y Y N N Y

• arsenic

Y Y N N Y

• copper

Y Y Y

• Y
• Y

Y nickel Y Y N N Y

• chloride

Y Y N N Y

• sulphate

Y Y N N Y

• potassium

Y

• Y

N Y

• Y

molybdenum Y Y N N Y

• strontium

Y

• Y

N Y

• Y

uranium Y

• Y

N N

• phosphate-P (total)

Y

• Y

Y

• Y

nitrate-N Y Y Y

• Y
• Y

Y Future Prediction Past Performance Outcome

King Pond EQC remain protective for Lynx Project

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Runoff Management

• Small catchment area reports

to Lynx Pit and dewatered Lynx Lake and limited surface runoff flows are expected

• Low height fill berms as

deflection structures and/or pumping sumps have been considered to direct runoff away from the open pit

• perations
• Detailed design of deflection

structures would be provided as required

Ekati Lynx Project Technical Sessions

MANAGEMENT PLANS

Agenda Topic:

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Management Plan Updates and Timing

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Main Topics of Discussion

• List of Plans requiring updates

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Requiring amendment for Lynx Project:

• Wastewater and Processed Kimberlite Management Plan
• Waste Rock and Ore Storage Management Plan
• Interim Closure and Reclamation Plan
• Wildlife Effects Monitoring Program
• Air Quality Monitoring and Management Plan (possible)
• Aquatic Effects Monitoring Program Design Plan (possible)

Not Requiring Amendment for Lynx Project:

• Waste Management Plan (Jan’14)
• Engagement Plan (Jan’14)
• Spill Contingency Plan (Oct’13)
• Response Framework (Jan’14)

Environmental Monitoring and Management Plans

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Water and Aquatics Monitoring

Need for additional AEMP Monitoring is unclear

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Waste Rock and Ore Storage Management Plan

Lynx Pit is in granite

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Waste Rock and Ore Storage Management Plan

Further geochemical characterization and operational monitoring is not required

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Waste Rock Seepage Monitoring (2013)

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Air Quality Monitoring and Management Plan

Snow and Lichen Sampling Dustfall Sampling

Ekati Lynx Project Technical Sessions

CLOSURE

Agenda Topic:

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The Lynx open pit, road and rock pile (if not used for construction) can be reclaimed according to provisions and goal of the existing Ekati Mine ICRP:

• the pit will be filled with natural runoff, precipitation, and water pumped from

Lac de Gras (~ 6 months to refill)

• An outlet from the final pit lake will be established to join natural flow channels
• Design of shallow zones will be considered according to the ICRP
• Water quality during and after flooding will be monitored
• All areas will be safe for people and wildlife

Reclamation Security can be estimated using the existing Reclaim model.

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Reclamation

Ekati Lynx Project Technical Sessions

LAND USE PERMIT

Agenda Topic:

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Proposed Lynx Land Use Permit Area

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Wildlife Effects Monitoring Program

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The Lynx Project is readily incorporated into the Ekati Mine WEMP

• Lynx area was included in the annual Wildlife Effects Monitoring Program

study area

• In 2013, this included monitoring wildlife habitat loss and alteration,

wildlife incidental observations and incidents, caribou behaviour, grizzly bear hair snagging, wolf den monitoring, North American Breeding Bird Survey

• In past years, has also included caribou aerial surveys and wolverine

hair snagging studies

• Ground-based survey of Lynx pit area and access road undertaken in 2013.

All wildlife and wildlife sign recorded

• No unique wildlife habitat or features (such as dens, nests, eskers, water

crossings) were observed

Lynx Access Road

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Caribou crossings will be constructed along Lynx access road , locations identified in discussion with Aboriginal communities

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Thank You