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AREA /COMPONENT I HAZARD /CONTAMINANT I POTENTIAL RELEASE MECHANISMS <br />MINE <br />Open pit <br />Waste rock <br />stockpile <br />Mudstone dump <br />Overburden dump <br />sediment <br />ARD /metals (copper, mercury <br />and others) <br />Nitrates from explosives <br />physical <br />physical <br />sediment <br />ARD /metals, nitrates <br />physical <br />sediment, nitrates, metals <br />physical <br />sediment <br />surface runoff <br />surface runoff, seepage <br />surface runoff, seepage <br />slope stability <br />slope stability <br />surface runoff <br />surface runoff, seepage <br />slope stability <br />surface runoff <br />slope stability <br />surface runoff <br />Water management (ditches, <br />sediment ponds, holding <br />ponds) <br />Water treatment facility <br />Constructed wetlands <br />Effluent discharge <br />pipelines <br />sediment <br />ARD from pit and waste rock <br />stockpile <br />nitrates <br />mercury <br />ARD from pit and waste rock <br />nitrates, metals <br />mercury <br />nitrates, metals <br />mercury <br />surface runoff <br />breach, overflow <br />surface runoff <br />methylation <br />surface discharge <br />surface discharge, <br />seepage <br />methylation <br />surface runoff <br />methylation <br />Sewage treatment <br />Mine plant and explosive <br />storage <br />Haul roads, forest access <br />relocation <br />bacteria, nitrates <br />fuel, oils, nutrients <br />sediment, ARD <br />fuel, oils <br />mercury <br />surface runoff, seepage <br />surface runoff, seepage <br />surface runoff, <br />spills <br />methylation <br />1 <br />• <br />• <br />QUALITATIVE ENVIRONMENTAL RISK ASSESSMENT FOR MINE DEVELOPMENT <br />TABLE 1 <br />COMPONENT HAZARD IDENTIFICATION AND POTENTIAL <br />RELEASE MECHANISMS <br />