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

Identification of Potential EnvironmentalEffects and Proposed MitigationThe water management plan will involve having all poor-quality water reporting to the TMF.This will include domestic wastewater, treated sewage effluent, runoff from around the mine site,and the tailings themselves. The impoundment facility will contain poor quality water that willbe high in metals.Proposed MitigationDust: Dust generation from the use of roads and the airstrip will be mitigated by either roadwatering or by using some other non-toxic, non-wildlife attractant substance to suppress dust.Drainage and sediment control structures will be used according to best management practicesduring construction.ANFO Use: ANFO will be stored in an enclosed building, and spillage around the storage andloading area will be minimized by having a solids management plan. Runoff from around thestorage and loading area will be directed away from surface waters by bunded storage surfaces.Nitrogen residues in pit sump water will be minimized to the extent possible. Best managementpractices will be used for the handling and use of explosives to minimize excessive residue andnitrogen loading.Runoff from Waste Rock Piles, Stockpiles, Roads: Poor-quality runoff from waste rock pilesand any ore stockpiles will be collected and diverted to the Tailings Management Facility. Theuse of non-reactive rock will be used for the construction of roads to the extent possible. Roadalignments will be sited along basin boundaries where possible, and avoid lakes and streamswhere possible.Lake Dewatering: Once the water quality of Camp Lake is no longer acceptable to be dischargedinto the receiving environment, water will not be discharged, but will be transported to the TMFor some other contained facility.Concentrate Fugitive Dust: As concentrate is the final product of the mine, great care will betaken to contain concentrate during storage, handling, and transport. Storage areas will alwaysbe covered and bunded, and transport will be by covered truck.Fuel Transport and Handling: Fuel storage and handling areas will be lined to contain anyhydrocarbon leakage.In-Stream Construction: Coffer dams will be used to facilitate the construction of dams.Draining and sediment control structures will be used according to best management practices.Environmental monitoring will be provided during construction to ensure compliance with anyfisheries authorizations, and to ensure the functioning of drainage and sediment controlstructures. The timing of in-stream construction will also comply with DFO regulations.Discharge of Tailings Management Facility (TMF): Poor-quality water from the mine will betransported to the TMF, including site runoff, camp wastewater, sewage effluent, and the tailingsthemselves. Having all of the liquid waste in one facility allows for better control andmanagement of the poor-quality water. The TMF will be designed as a zero discharge facilityJanuary 2008 Hackett River Project – Project Proposal Sabina Silver CorporationReport Version B.1 7–11 Rescan Environmental Services Ltd. (Proj. #833-2)