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

Project DescriptionThe airstrip will be connected to the overhead pole line and have a standby power diesel genset inthe event of a pole line failure.The control of the emergency power loads will be through the process control system. Thissystem will stagger starts, automatically start and stop loads to keep process tanks properlyagitated and run equipment such as lubrication pumps on the large Mills and underground minerequirements. The main requirements for standby power include:• Mine ventilation• Mine dewatering• Process plant critical loadsUninterruptible power supplies will be used to provide back-up power to critical control systems.The UPS equipment will be sized to permit operations to shut down and back up the computerand control systems to facilitate start-up on restoration of normal power.Emergency battery power packs will supply back-up power to the fire alarm system andemergency egress lighting fixtures.2.6.1.7 Fuel Storage and DistributionDiesel fuel will be pumped from the on-site tank farm by pipeline to day tanks at the powerstations. In accordance with environmental requirements, the generators will use Arctic grade,“ultra-low sulphur” diesel.2.6.1.8 Electrical and Control RoomsTo minimize installation costs, the electrical rooms will be distributed around the site and locatedas close as possible to the major electrical loads.All process electrical and control rooms will be modular units assembled off-site in a factory.The rooms will be installed outdoors on elevated steel structures adjacent to process areas orindoors on elevated structures. The rooms shall be self-supporting and designed for roadshipment, lifting and transporting to site.All electrical controls and instrumentation equipment will be installed, wired and completelytested before shipment to site.The rooms will be built to meet a one-hour fire rating. All openings will be sealed and madewater- and dust-tight by using approved fire-retardant materials.All electrical rooms will have two means of egress at opposite ends of the room. Doors to therooms will be supplied with panic exit type hardware. Each room will also have an equipmentdoor sized to permit the largest piece of equipment to be installed/removed without removing thedoor from its hinges. The floors of the rooms will be elevated a minimum of 200 mm above theadjacent process concrete floors. No liquid or fluid piping will be routed through electricalrooms.January 2008 Hackett River Project – Project Proposal Sabina Silver CorporationReport Version B.1 2–26 Rescan Environmental Services Ltd. (Proj. #833-2)