EKATI Diamond Mine Interim Closure and Reclamation Plan - Closure - PowerPoint PPT Presentation

EKATI Diamond Mine Interim Closure and Reclamation Plan - Closure Options Evaluation Presentation Part 1: Overview

Presentation Overview • Part 1: Process to Date – Closure Plan Development Update – Community Suggestions and Concerns • Part 2: Closure Options Presentation – Discussion of Major Mine Components - Open Pits, Waste Rock Storage Area and Long Lake Containment Facility (LLCF). – Presentation of Closure Options for Panda/Koala/Beartooth/ Panda Diversion Channel (PDC), Misery and Fox Areas, and Long Lake Containment Facility – Risk Assessment Results (Advantages and Risks) • Part 3: Closure Options Evaluation Process • Part 4: Closure Plan Development - Remaining Work Closure Options Evaluation Meetings June 12, 2006

Closure Options Evaluation Meetings June 12, 2006

Community & Regulatory Input Summary • Community Input on Closure Suggestions and Concerns – Wekweti, June 6/05 - Community visit to EKATI – Rae/Edzo, June 7/05 - Community visit to EKATI – Kugluktuk, June 13/05 - Community visit to EKATI – Lutsel K’e, June 14/05 - Community visit to EKATI – IEMA ,October 28/05 meeting, and March 31/06 Letter to BHP Billiton – IACT (Regulatory – INAC, WLWB, GNWT, DFO, EC, IEMA) November 14/06 – Kugluktuk, 8 November/05 – Meeting in community – Lutsel K’e, 15 November/05 – Meeting in community – NSMA, 13 February/06 – Written correspondence • EKATI Interim Closure Plan Working Group – Community, Regulatory and IEMA input on Interim Closure Plan Terms of Reference, January-May/06 Closure Options Evaluation Meetings June 12, 2006

Community & Regulatory Concerns Summary Kugluktuk, Lutsel K’e, NSMA, Becho Ko, Wekweti, IEMA, IACT • Open Pits – Water ‘ Establish clean water habitat’ ‘Make sure water in pit is safe’ ‘Water quality, metals and contaminants is a concern’ – Fish and Animal Health ‘pits are too deep for fish’ ‘will the fish be good to eat’ ‘Keep all biological out’ ‘Animal safety’ ‘prevent animals falling into the pits’ – General ‘don’t want to see a big hole’ ‘put rock back in pits’ ‘If the lakes are flooded quickly, where will the water come from, and will there be enough available?’ Closure Options Evaluation Meetings June 12, 2006

Community & Regulatory Concerns Summary Kugluktuk, Lutsel K’e, NSMA, Becho Ko, Wekweti, IEMA, IACT • Waste Rock Storage Areas – Wildlife safety ‘ make it safe for caribou to travel over’ ‘allow wildlife access’…’wildlife ramps – not to encourage use but to allow them to get off’ ‘ we see caribou injured from big rocks’ – Water Quality ‘ is there any sign of anything bad coming from the waste rock?’ – General ‘restore to pre-existing environment’ ‘capping source for LLCF’ ‘what kind of vegetation will grow on the waste rock’ ‘how much erosion will there be from the rock piles’ Closure Options Evaluation Meetings June 12, 2006

Community & Regulatory Concerns Summary Kugluktuk, Lutsel K’e, NSMA, Becho Ko, Wekweti, IEMA, IACT • Long Lake Containment Facility – Animal Health ‘we do not want to get sick eating caribou that is sick – this is the future of our children’ ‘will the ice freeze the same, or will there be thin hidden thin spots – dangerous for traveling and caribou’ – Water Quality ‘this is our drinking water’ ‘Monitor the water that comes to the community’ – General ‘Physical stability (frozen or dry, erosion)’ ‘Plant vegetation’ ‘Don’t plant vegetation and attract wildlife’ ‘Erosion resistant cap’ ‘Tailings backfill into pits’ Closure Options Evaluation Meetings June 12, 2006

EKATI Diamond Mine Interim Closure and Reclamation Plan - Closure Options Evaluation Meetings Part 2: Closure Options Presentation

EKATI Diamond Mine Panda / Koala / Beartooth / PDC Closure Options

Panda / Koala / Beartooth / PDC Mine Components Beartooth Pit Beartooth Pit Panda Waste Rock Panda Waste Rock Storage Area Storage Area Upper Panda Upper Panda Lake Lake Panda Pit Panda Pit Koala Waste Rock Koala Waste Rock Koala North Pit Koala North Pit Storage Area Storage Area Koala Pit Koala Pit Panda Panda Diversion Diversion Main Camp Main Camp Channel Channel Closure Options Evaluation Meetings June 12, 2006 Kodiak Lake July 2005 Image Kodiak Lake

Panda and Koala Open Pits and Underground Mines Closure Options Evaluation Meetings June 12, 2006

Panda, Koala and Beartooth Open Pits General Information Final Volume (m 3 ) Pit LOM Completion Beartooth 12M 2009 (Open Pit) Panda 37M 2010 (U/G) Koala 42M 2020 (U/G) • General Information – Bearclaw Pipeline redirects Bearclaw Lake flow around Beartooth Pit – Underground connections (3) between Panda and Koala – Panda Diversion Channel redirects flow around Panda and Koala Pits – Fish habitat loss has been compensated for Beartooth, Panda and Koala Lakes Closure Options Evaluation Meetings June 12, 2006

Panda / Koala / Beartooth Beartooth Pit Panda / Koala / Beartooth Beartooth Pit Waste Rock Storage Area Waste Rock Storage Area Processed Kimberlite Coarse Rejects Processed Kimberlite Coarse Rejects Panda Pit Panda Pit Koala Pit Koala Pit Drainage Direction Closure Options Evaluation Meetings Panda Diversion Channel June 12, 2006 Panda Diversion Channel

Panda / Koala / Beartooth Waste Rock Storage Area General Information • Physical Description – Waste Rock Area includes: – Coarse Rejects Pile – Landfill/Landfarm/Zone S/Contaminated Snow Containment Facility – Koala Lake Sediments – Waste granite • Inset lifts of 10-20m deep with natural rock face repose angles of approximately 35 0 . Overall slope angle of 25 0 . • Predicted final height 512m • Final height will be 50m above the highest point of land which falls within the planned waste rock storage area footprint • Fragmentation size encourages permafrost development Closure Options Evaluation Meetings June 12, 2006

Waste Rock Pile Construction • Rainwater and snowmelt flow into the pile and freeze Dry Permafrost Rock Dry Permafrost Rock Ice- -Saturated Rock Saturated Rock Ice Tundra Tundra • Large rocks at the base Winter Wind of the pile allow the pile to Supercool through Air Convection Convection Currents Tundra Tundra Closure Options Evaluation Meetings June 12, 2006

Panda Diversion Channel Panda Pit Panda Pit Koala Pit Koala Pit Panda Diversion Panda Diversion Channel Channel Closure Options Evaluation Meetings June 12, 2006

Panda Diversion Channel - General Information • Physical Information – Constructed in 1997 to divert flow around Panda and Koala pits, and as compensation for the loss of stream habitat during the development of EKATI. – 3.4 kms long. – The PDC receives water from North Panda, Grizzly and Buster lakes, and drains into Kodiak Lake. – In 2005 a total of 440 fish moved through the Channel’s Lower Fish Box (258 in and 182 out). A total of 254,051 eggs were estimated to have been deposited in the PDC during the spawning run, and a total of 3,519 fry were counted. – 2000 Approved A&R Plan states that ‘Upon closure, culverts will be removed, original streams re-established, and frozen core dam will be breached’. – DFO expectation that PDC remains open into perpetuity. Closure Options Evaluation Meetings June 12, 2006

Panda / Koala / Beartooth / PDC Closure Options Option Waste Rock Panda/Koala Pits PDC Beartooth Pit Storage Area Abandon Channel & A Natural Flooding and Recontour Natural Flooding Re-establish stream Reconnect (approved 2000 A&R flow Plan) B Backfill into Pits Waste Rock Backfill Leave Channel Open Waste Rock Backfill PK Disposal in Panda, followed with Wildlife Ramps and PK Disposal Followed C Leave Channel Open Pump Flooding Vegetation Islands with Pump Flooding Pump Flood Koala No Vegetation and D Pump Flooding Leave Channel Open Pump Flooding No Access Closure Options Evaluation Meetings June 12, 2006

Pit Wall Resloping 155 years Natural Flooding Recontour 70 years Waste Rock Pit Berms Constructed Prior to Flooding 42 years Abandon PDC, Redirect Flow Through Pit Lakes Upper Panda Natural Flooding Lake and Reconnect Closure Options Evaluation Meetings June 12, 2006