340821-001 FINAL United Keno HHERA 4 May 2011

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Human Health and Ecological Risk Assessment for the Historic Keno Hill Mine Site Figure 2.2 Detailed Site Plan 340821-001 – FINAL – May 2011 2-3 SENES Consultants Limited
Human Health and Ecological Risk Assessment for the Historic Keno Hill Mine Site The Keno Hill area has four main water bodies: South McQuesten River, Christal Creek, Flat Creek and Lightning Creek. Christal Creek receives metal-laden inputs from the Galkeno 900 adit, the Galkeno 300 adit and various seepages from workings on the west face of Keno Hill, and also is the receiving water body for Christal Lake which receives wastewater from Galkeno 900 and Mackeno. In addition, there are tailings in the lake that were directly deposited in the past, and the Mackeno tailings pile lies adjacent to the lake. Christal Creek ultimately empties into South McQuesten River, as does Flat Creek which originates on Galena Hill and receives mine effluent from the Elsa Valley tailings facility and various discharges on Galena Hill. Several other smaller tributaries (Galena Creek, Brefault Creek, No Cash Creek, Sandy Creek, Star Creek, Porcupine Creek) originate on Galena Hill, receiving drainages from various adits on and around Galena Hill before emptying into Flat Creek upstream of South McQuesten River. Lightning Creek originates east of the site, flowing just south of Keno City before emptying into Duncan Creek. It receives drainages from various adits on the south side of Keno Hill and the north side of Sourdough Hill, and is also impacted by on-going placer mining activity unrelated to the Elsa/Keno mining developments. Duncan Creek is a tributary of the Mayo River, and both the South McQuesten and Mayo Rivers ultimately drain into the Steward River. 2.2 SUMMARY OF PREVIOUS INVESTIGATIONS A series of aquatic and terrestrial environmental assessment reports are available, documenting environmental monitoring data and site conditions. The major findings of the assessments are discussed briefly in the following sections. 2.2.1 Aquatic Environment The aquatic environment of the Keno Hill area has been described extensively in several reports, from 1985 through to 2010 (Table 2.1). Data have been collected from various locations, but have focused on Christal Creek, Flat Creek, Lightning Creek and South McQuesten River. Figure 2.3 provides a summary of the impacted and background/reference stations from where data are available. For clarity, adit and treatment pond stations are not shown. 340821-001 – FINAL – May 2011 2-4 SENES Consultants Limited
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340821-001 FINAL United Keno HHERA 4 May 2011

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