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

Project DescriptionThe locations of the two diesel stations will minimize the distance to the major process loads,namely the grinding mills and the underground hoists.The complete diesel power station including generating units and associated equipment will besupplied in a modular arrangement, complete with fuel handling, lubrication, air handling,exhaust, starting equipment, electrical distribution switchgear, heat recovery systems, andancillaries. Provision will be allowed for the addition of one additional genset in each dieselpower station for future power growth. The stations will be housed in pre-engineered buildingsand incorporate outdoor areas for exhaust and (summer-use) radiators.2.6.1.2 Main SubstationThe main substation will be adjacent to the mill, where the largest loads are located, to minimizecabling costs and losses. The substation will include the following equipment:• Primary Distribution Center (PDC)• Metering transformersFeeders from the substation will be run in cable tray or on power lines to the area loads.2.6.1.3 Underground Mine Power SupplyThe primary power supply to the underground mine will be two 13.8 kV feeds from step uptransformers and powered from the main PDC located at the main substation. A third feeder willprovide power to the Mine Hoist requirements.Permanent electrical distribution centres will be provided at the shaft/hoist areas with lightingand small power receptacles and at the underground crushing, shops and mine dewateringfacilities.The underground substations will be low-profile, heavy-duty, skid-mounted units that arecomprised of: main incoming visible fused load break disconnect switch, surge arresters,transformer, neutral grounding resistor, modular LV distribution equipment and grounding andground check monitoring equipment. Cabling will be connected to the distribution gear withapproved grounding type receptacles.2.6.1.4 Process Plant and Ancillary Services Power SupplyThe process plant distribution voltage will be 4.16 kV obtained from the PDC switchgear in themain substation. This switchgear will feed the following equipment:AreaMain Process AreasPrimary Crushing and Reclaim and Pebble CrushingCamp, Maintenance Shops, WarehouseFresh Water System, Tailings Reclaim, Ancillary ServicesExplosives, Sewage, Paste Backfill and IncineratorElectrical DistributionCable in tray located in utilidors and/or routed through process buildingsCable in tray located in utilidors and/or routed through process buildingsand through conveyor galleriesCable in tray located in utilidors and/or routed through process buildingsDedicated 13.8 kV power linesJanuary 2008 Hackett River Project – Project Proposal Sabina Silver CorporationReport Version B.1 2–24 Rescan Environmental Services Ltd. (Proj. #833-2)