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Some Unique Approaches to Tailings Management and Heap Leaching Adding Value. Delivering Results . GOLD TAILING STORAGE FACILITY DESIGN AND CONSTRUCTION Project Spotlight: Fort Knox Mine, Alaska GOLD TAILING STORAGE FACILITY DESIGN AND

  1. Some Unique Approaches to Tailings Management and Heap Leaching Adding Value. Delivering Results .

  2. GOLD TAILING STORAGE FACILITY DESIGN AND CONSTRUCTION Project Spotlight: Fort Knox Mine, Alaska

  3. GOLD TAILING STORAGE FACILITY DESIGN AND CONSTRUCTION Project Spotlight: Fort Knox Mine, Alaska • Large Embankment Dam converted • Excavated first into dam to re ‐ orientate to centerline raises the “engineered” zones and then re ‐ used Seal Zone material • Construction of first platform in deep water • High seismic and cold climate area • Rock fill separator dyke constructed also in deep water

  4. GOLD TAILING STORAGE FACILITY DESIGN AND CONSTRUCTION Project Spotlight: Fort Knox Mine, Alaska Recent second platform and step out on tailings beach

  5. GOLD TAILING STORAGE FACILITY DESIGN AND CONSTRUCTION Project Spotlight: Fort Knox Mine, Alaska

  6. GOLD TAILING STORAGE FACILITY DESIGN AND CONSTRUCTION Project Spotlight: Fort Knox Mine, Alaska

  7. GOLD TAILING STORAGE FACILITY DESIGN AND CONSTRUCTION Project Spotlight: Fort Knox Mine, Alaska

  8. GOLD TAILING STORAGE FACILITY DESIGN AND CONSTRUCTION 1 st construction to el. Project Spotlight: Fort Knox Mine, Alaska 1515’ over 2 nd BWP Construction of 2 nd BWP 2 nd construction to 1 st construction to el. 1515’ over 1 st el. 1488’ over 1 st BWP BWP Spigot discharge Spigot discharge

  9. Gold Tailings Storage Facility Within a Heap Leach Pad Project Spotlight: La Quinua Mine , Peru • Wrap around leach ore • Rotational deposition of thickened embankments provide tailings tailings to produce drained beaches containment • Separate fluids removal systems • Design for high seismic loading • 2011/2012 extensive geotechnical investigation to prove up earlier adopted design parameters

  10. Gold Tailings Storage Facility Within a Heap Leach Pad Project Spotlight: La Quinua Mine , Peru

  11. Gold Tailings Storage Facility Within a Heap Leach Pad Project Spotlight: La Quinua Mine , Peru Key Issues Leach ore embankments needed to provide the high level of security required of other major tailings dams However, the leach ore is placed in thick 16 m uncompacted lifts to maintain adequate permeability for leaching and is irrigated with a high solution rate (10 L/hr/m 2 ) Loose structure made static and dynamic liquefaction a key issue

  12. Gold Tailings Storage Facility Within a Heap Leach Pad Project Spotlight: La Quinua Mine , Peru Design Solution Provide the embankments with wide cross sections to support loading and leaching and thus wide shells Keep side slope leaching rates low (max. 3 L/hr/m 2 ) Thicken the tailings to reduce the amount of water entering the combined facility Use a rotational tailings deposition method from the inside crests of the embankments to build drained and stable beaches against the embankments

  13. Gold Tailings Storage Facility Within a Heap Leach Pad Project Spotlight: La Quinua Mine , Peru Design Approach Keep the ore that becomes saturated or near saturated when under leach well ‐ removed from the outer faces of the embankments and contained behind large unsaturated structural shells

  14. Gold Tailings Storage Facility Within a Heap Leach Pad Project Spotlight: La Quinua Mine , Peru 2011/2012 Geotechnical investigation consisted of: Sonic drilling to obtain leach ore samples SCPT testing to evaluate liquefaction potential, residual (post ‐ liquefaction) undrained shear strengths, and peak undrained shear strengths of the mill sands and leach ore SCPT testing and piezometers installations to fill in gaps from previous installations to evaluate pore pressure profiles within the mill sands and the leach ore embankments Assess potential borrow material for suitability for use in raise berm construction associated with expanding mill sands storage capacity

  15. Gold Tailings Storage Facility Within a Heap Leach Pad Project Spotlight: La Quinua Mine , Peru Some dilatant ore Some contractant ore

  16. Gold Tailings Storage Facility Within a Heap Leach Pad Project Spotlight: La Quinua Mine , Peru Leach Ore Post Liq Su/p’ = 0.1 Liquefaction of saturated ore Both findings consistent with is predicted previous information

  17. Gold Tailings Storage Facility Within a Heap Leach Pad Project Spotlight: La Quinua Mine , Peru

  18. Gold Tailings Storage Facility Within a Heap Leach Pad Project Spotlight: La Quinua Mine , Peru Maximum predicted MCE earthquake induced deformation = 0.3 m at toe

  19. Gold Tailings Storage Facility Within a Heap Leach Pad Project Spotlight: La Quinua Mine , Peru North Expansion Design Underway Consists of two new storage impoundments: • Stage 1 with a capacity of 18 Mt, and • Stage 2 with a capacity of 11 Mt.

  20. Gold Tailings Storage Facility Within a Heap Leach Pad Project Spotlight: La Quinua Mine , Peru Leaching operations will end prior to the construction of the North Expansion.

  21. Gold Tailings Storage Facility Within a Heap Leach Pad Project Spotlight: La Quinua Mine , Peru

  22. Copper A Possible New Reclaim Water Barge Access Project Spotlight: Sierrita Mine , Arizona

  23. Copper A Proposed New Reclaim Water Barge Access Project Spotlight: Sierrita Mine , Arizona Using Aqua Barriers Filled with Water or Geotubes Filled with Tailings

  24. Copper A New Reclaim Water Barge Access Project Spotlight: Sierrita Mine , Arizona

  25. Copper A New Reclaim Water Barge Access Project Spotlight: Sierrita Mine , Arizona

  26. Copper A New Reclaim Water Barge Access Project Spotlight: Sierrita Mine , Arizona

  27. Copper Steep and In Places Unstable Slopes to Line Project Spotlight: La Granja Mine , Peru

  28. Copper Steep Slopes to Line Project Spotlight: La Granja Mine , Peru Side Slope Fills Also serve to provide access and water diversion platforms

  29. Copper Steep Slopes to Line Project Spotlight: La Granja Mine , Peru Step 1 Step 2

  30. Copper Steep Slopes to Line Project Spotlight: La Granja Mine , Peru Step 3 Step 4

  31. Copper Steep Slopes to Line Project Spotlight: La Granja Mine , Peru Step 5

  32. Copper Steep Slopes to Line Project Spotlight: La Granja Mine , Peru

  33. Copper Steep Slopes to Line Project Spotlight: La Granja Mine , Peru

  34. Copper Steep Slopes to Line Project Spotlight: La Granja Mine , Peru

  35. Copper Steep Slopes to Line Project Spotlight: La Granja Mine , Peru

  36. Gold Large Height and Cold Regions Heap Leach Facility Project Spotlight : Fort Knox , Alaska

  37. Gold Large Height and Cold Regions Heap Leach Facility Project Spotlight : Fort Knox , Alaska Largest height heap from toe to crest ‐ current design 800’ but planned to be expanded to 1100’ Maximum of 500’ above liner at any point In ‐ heap solution collection pond for winter operations Ore is competent granite ‐ free draining and high strength Leaching occurs all year including through very cold winters

  38. Gold Large Height and Cold Regions Heap Leach Facility Project Spotlight : Fort Knox , Alaska Underdrain System and PCMS Plan

  39. Gold Large Height and Cold Regions Heap Leach Facility Project Spotlight : Fort Knox , Alaska In Heap Pond and Solution Collection Pipework

  40. Gold Large Height and Cold Regions Heap Leach Facility Project Spotlight : Fort Knox , Alaska

  41. Gold Large Height and Cold Regions Heap Leach Facility Project Spotlight : Fort Knox , Alaska

  42. Gold Large Height and Cold Regions Heap Leach Facility Project Spotlight : Fort Knox , Alaska Performance to Date

  43. Gold Large Height and Cold Regions Heap Leach Facility Project Spotlight : Fort Knox , Alaska Liner system consistent with industry standard, and using best practice construction QA/QC Double lined area under In Heap Pond – LCRS flows are 0.01 gpm or 2 orders of magnitude less than permit levels PCMS system for the detection of leaks “located beneath the portions of the liner which have the greater potential for leakage” – nothing reported Groundwater drain system under the HLF that will intercept any seepage from it – any seepage will report to it – no impacts of CN reported Groundwater regime that is contained in the valley and drains to the TSF – seepage cannot exit anywhere else Extensive flow, head pressure and water quality monitoring give results to date that are equal to or better than design

  44. Gold Large Height and Cold Regions Heap Leach Facility Project Spotlight : Fort Knox , Alaska Stage 3

  45. Gold Large Height and Cold Regions Heap Leach Facility Project Spotlight : Fort Knox , Alaska Stage 5

  46. Gold Large Height and Cold Regions Heap Leach Facility Project Spotlight : Fort Knox , Alaska Stage 7

  47. Gold Large Height and Cold Regions Heap Leach Facility Project Spotlight : Fort Knox , Alaska

  48. Gold Large Height and Cold Regions Heap Leach Facility Project Spotlight : Fort Knox , Alaska

  49. Gold Large Height and Cold Regions Heap Leach Facility Project Spotlight : Fort Knox , Alaska

  50. Thank you Adding Value. Delivering Results .

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