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Sunnyside Mine-AD- a Water Addition <br /> TECHNICAL MEMORANDUM <br /> Received <br /> DATE: 6 June, 1995 0 <br /> ►; � � 9QQ� <br /> TO: William Goodhard (Sunnyside Gold Corporation) Durango Field Office <br /> DM*io <br /> FROM: Mark J. Logsdon (Geochimica) 'cO yak a G„ology <br /> RE: TECHNICAL RATIONALE FOR ADDITION OF <br /> ALKALINE WATER IN BULKHEADED SUNNYSIDE <br /> MINE <br /> BACKGROUND <br /> Sunnyside Gold Corporation (SGC) has ceased operations at the Sunnyside Mine, San <br /> Juan County, Colorado, located on streams that are tributary to the Animas River <br /> above Silverton, Colorado. As part of mine closure, SGC intends to bulkhead the <br /> workings and allow the mine to re-saturate. Hydraulic and geochemical modeling <br /> predict that re-saturating the mine workings and forcing water to flow through the <br /> natural ground will limit acid generation and leaching of metals (Simon Hydro-Search, <br /> 1993). <br /> As part of their mine-closure strategy, SGC proposes to accelerate the hydraulic and <br /> geochemical processes by pumping water with excess alkalinity into the workings. <br /> ISSIIES <br /> 1. Compared to a base case of allowing the mine to re-saturate due to natural <br /> infiltration alone, what is the hydraulic effect of flooding the workings rapidly? <br /> 2. Compared to a base case of allowing natural geochemical processes to control the <br /> geochemistry during gradual re-saturation, what are the geochemical effects of <br /> flooding the workings rapidly, particularly with water to which excess alkalinity <br /> has been added? <br /> Geochindca, Inc. 1 ALKALINITYI&Jun-95 <br />