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

Dominion Diamond’s Lynx Project Wek’eezhii Land and Water Board Technical Session Dec 3-4, 2013 1_ Dominion Diamond Ekati Corporation

Dominion Diamond is the NWT’s Largest Mining Company We are a Canadian owned Company Dominion owns: Most of the Part of the Ekati Diamond Diavik Diamond Mine (80%) Mine (40%) Lorem ipsum Dominion employs more Northerners than any other mining company in the NWT. 2_ Dominion Diamond Ekati Corporation

Ekati Diamond Mine 3_ Dominion Diamond Ekati Corporation

Location of Lynx Kimberlite Pipe 4_ 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 5_ Dominion Diamond Ekati Corporation

Lynx Waste Rock Management Extension to Misery WRSA and/or Crushing and use in future projects 6_ Dominion Diamond Ekati Corporation

Proposed Lynx Project 7_ Dominion Diamond Ekati Corporation

www.ddcorp.ca Ekati Lynx Project Technical Sessions Agenda Topic: WATER MANAGEMENT AND EFFLUENT QUALITY CRITERIA (EQC) 8

www.ddcorp.ca Ekati Lynx Project Technical Sessions Agenda Topic: EQC FOR DEWATERING TO LAC DE GRAS 9

www.ddcorp.ca EQC for Dewatering to Lac de Gras Main Topics of Discussion • Baseline water quality for Lynx Lake and Lac de Gras • Summary of additional 2013 sampling conducted in Lynx Lake 10

www.ddcorp.ca Water Management and Effluent Quality Criteria Lynx Lake Baseline Data Hammer Lake Lynx Lake 11

www.ddcorp.ca Water Management and Effluent Quality Criteria Lynx Lake Baseline Data Lynx Lake – looking North 12

www.ddcorp.ca Water Management and Effluent Quality Criteria 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 Water Sediment Benthic Fish Habitat Location Photos Bathymetry Phytoplankton Zooplankton Quality Quality Invertebrates Sampling 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 - - - - - 13

www.ddcorp.ca 2013 Aquatics Data Collection – Fish and Fish Habitat Lynx Lake Shoreline Aerial view of Lynx Creek mid reach 14

www.ddcorp.ca 2013 Aquatics Data Collection – Fish and Fish Habitat Lynx Lake Bathymetry Lynx Lake Substrate Types 15

www.ddcorp.ca Lac de Gras Baseline Water Quality • 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 16

www.ddcorp.ca Lynx Lake and Lac de Gras Baseline Water Quality Lac de Gras (Diavik AEMP) a Lynx Lake b Small Lakes c Lake Station Area Far Field 1 Far Field 2 all all EQC not pH 6.6 - 6.9 6.8 - 7.0 6.4 - 7.3 6.5 - 6.9 needed for hardness (mg CaCO3/L) 5.6 - 5.8 7.1 - 7.4 5.2 - 8.8 3.8 - 6.1 lake TDS (mg/L) 10 - 16 12 - 16 14 - 23 5 - 21 Aluminum ( µ g/L) dewatering 5.6 - 7.0 4.1 - 7.0 13.7 - 50.3 5.6 - 21.0 Arsenic ( µ g/L) 0.13 - 0.16 0.19 - 0.26 0.30 - 0.43 0.27 - 0.60 Copper ( µ g/L) 0.53 - 0.58 0.55 - 0.69 1.26 - 1.80 0.44 - 1.50 Monitor TSS Iron ( µ g/L) 5.0 - 7.0 5.2 - 24.0 53.0 - 274.0 20.0 - 229.0 Manganese ( µ g/L) 1.48 - 1.54 1.49 - 2.20 8.2 - 62.4 2.6 - 46.0 Molybdenum ( µ g/L) 0.11 - 0.14 0.43 - 0.56 <0.05 - 0.08 <0.05 - 0.06 Strontium ( µ g/L) 8.43 - 8.63 14.3 - 15.5 9.2 - 10.1 4.3 - 7.4 Uranium ( µ g/L) 0.024 - 0.030 0.058 - 0.910 0.032 - 0.044 <0.01 - 0.04 Zinc ( µ g/L) 0.3 - 0.9 0.2 - 4.4 1.0 - 8.1 0.8 - 3.2 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) 17 c = preliminary data Lakes C-L1 and D-L3 (August 2013) and lakes G-L2 and H-L1 (September 2013)

www.ddcorp.ca Lynx Lake Baseline Hydrology 18

www.ddcorp.ca Ekati Lynx Project Technical Sessions Agenda Topic: DEWATERING PLAN 19

www.ddcorp.ca Dewatering Plan 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 20

www.ddcorp.ca 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) 21

www.ddcorp.ca 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. • 22

www.ddcorp.ca Ekati Lynx Project Technical Sessions Agenda Topic: DESPERATION POND AND KING POND SETTLING FACILITY 23

www.ddcorp.ca Desperation Pond and King Pond 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 24

www.ddcorp.ca Misery Site Minewater Management Proposed to also include: • late stages of Lynx Dewatering • Lynx pit sump 25

www.ddcorp.ca King Pond Water Balance a Average Net Inflow to KPSF from Pumped Flow Average Natural from Average Pumped Flow Total Catchment and Desperation from Misery Pit Precipitation Pumped Flow Inflow Climatic Condition (mm) on Pond (m 3 ) Pond (m 3 ) from WRDP (m 3 ) (m 3 ) (m 3 ) Present Layout Average annual precipitation 338 107,000 114,000 55,000 108,000 384,000 Final Layout at End of Misery Expansion Increase: Average annual precipitation 338 107,000 33,000 55,000 161,000 356,000 ~87,000 m 3 /yr for 1-2 years 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. Storage Capacity of King Pond ~1M m 3 • 26

www.ddcorp.ca Misery Site EQC (2013 Water Licence Renewal) Future Prediction Past Performance Outcome current Response 2013 Parameters of Water Quality peak >100% benchmark? Assessed? peak >100% peak >75% Potential EQC King-Cujo Modelled? increasing Framework POI? Parameter benchmark? benchmark? parameter? trend? parameter? Interest are inclusive Y Y Y - Y - Y Y ammonia N (total) - aluminum Y Y N N Y - - - - of Lynx minewater arsenic Y Y N N Y - - - - copper Y Y Y - Y - - Y Y Y Y N N Y - - - - nickel chloride Y Y N N Y - - - - sulphate Y Y N N Y - - - - Y - - - Y N - Y potassium Y molybdenum Y Y N N Y - - - - strontium Y - - - Y N Y - Y uranium Y - - - Y N N - - Y - - - Y - Y phosphate-P (total) Y - nitrate-N Y Y Y - Y - - Y Y King Pond EQC remain protective for Lynx Project 27