080121-08MN006-Sabina Hackett River Project Proposal ... - NIRB

Project DescriptionTable 2.6-1Production Equipment Fleet on SiteEquipment Unit Size -1 -1 1 2 3 4 5 6 7 8 9 10 11 12 13 14Production Drill 171 mm 2 3 3 3 3 3 3 3 3 2 2 2 2 2Production Loader 17 m 3 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1Hydraulic Shovel 18 m 3 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1Haulage Truck 180 tonnes 3 7 10 10 10 10 10 10 10 10 10 10 10 10 10 10Breaker Loader 6.5 m 3 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1Track Dozer 306 kW 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3Grader 233 kW 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2Rubber Tired Dozer 350 kW 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1Utility Backhoe 2.3 m 3 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1Water Truck 20,000 litre 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1Ancillary EquipmentEquipment Size QuantityTool Carrier 120 kW 1Blasting Skid Steer Loader 1Light Plants 7Lube/Fuel Truck 1Mechanics Truck and Welding Trucks 2Crewcab Pickups/Pickups/Blasters Truck 8Pumps 1 ton 4Manbus 40 man 1Ambulance and Fire Truck 2Compactor 114 kW 1Wardrop, 20072.7.1.2 Tailings and Water ManagementTailings from the process plant will be in slurry form, at a pulp density of about 50% solids byweight. The tailings will be pumped via a tailings pipeline to the TMF. The tailings pipeline willbe high density polyethylene (HDPE). From experience at other Arctic operations, the tailingspipeline will not require insulation or heating, as the tailings will have sufficient heat from themilling process to avoid freezing.The TMF will store all tailings produced over the life of the mine, and will also serve as areservoir for process water, which will be reclaimed from the pond. A sufficient depth of waterwill be maintained to allow reclaim throughout the winter and to allow ice formation over thewater pond. This assumption will require a depth of at least 4 m of water over the pond. Thiswater storage requirement will dictate that the tailings dams will be designed as imperviousstructures.All of the sites under consideration will have limited drainage areas, so that the volume of runoffand direct precipitation to the TMF will be small in relation to the volume of water that will besequestered in the voids of the tailings. Water balance modelling indicates that the tailings pondwill have a significant net water deficit. This is advantageous, as it shows that the TMF can beYearJanuary 2008 Hackett River Project – Project Proposal Sabina Silver CorporationReport Version B.1 2–31 Rescan Environmental Services Ltd. (Proj. #833-2)