1993-04-15_REVISION - M1977378 (2)

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999 SUNNYSIDE MINE 'M � / 7 - 379 NA Area Inventory of Seeps, Springs and Flowing Adits Pre-Bulkhead Placement 1993 s PURPOSE: �p D 4467 The purpose of this report is to address the site inventory requirement in Item #2 of the adequacy concern letter (TR-14) April 15 1993 from the Division of Minerals and Geology (Division) . xisting springs, seeps and draining adits within the study area were inventoried to establish area background data on existing water conditions prior to bulkhead placement for elimination of tunnel drainage from the Sunnyside Mine as proposed in TR-14. METHODS: ,-- Sunnyside Gold Corporation (SGC) based this survey upon the Simon Hydro-Search reports (Feb. 1992, March 1993) and information requested by the Division, Item #2 (TR-14) April 15, 1993. The basis of this report is field work conducted by SGC with the inclusion of applicable data from the Colorado Department of Health's Upper Animas Study and SGC data files. Each area inventoried was bounded by two elevations and/or a major drainage feature. The lower elevation was 10,5091 , which is the lowest elevation of the Sunnyside Mine (American Tunnel) and approximately equivalent to the confluence of Cement Creek and the South Fork of Cement Creek. The South Fork of Cement Creek and Cement Creek are major drainage controls as outlined by Simon Hydro-Search and agreed upon by the Division. Other drainage features considered as bounding the areas to be inventoried were; the South Fork of the Animas, Eureka Creek from its confluence with the South Fork of the Animas to Parsons Creek, Parsons Creek, West Fork of the Animas and the creek draining Placer Gulch. The areas inventoried include the Cement Creek drainage (the preferential flow direction as identified by Simon Hydro-Search) and the additional areas requested by the Division (Eureka Gulch, Placer Gulch, California Gulch and the Uncompahgre River Basin below Lake Como) . The upper boundary, 12,2001 , is the elevation of the maximum potential water pool due to topographic boundaries. USGS topographic maps with the study area boundaries outlined are included in the data section of this report along with aerial photographs of most of the study area with overlays outlining sample points and study area boundaries.