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2.0 INTRODUCTION <br /> As part of the mine closure plan for the Sunnyside Mine, Sunnyside Gold Corporation <br /> (SGC) proposes to install underground bulkheads in the American Tunnel, Terry <br /> Tunnel, and Brenneman Vein. The bulkheads are designed to contain mine drainage, <br /> fill the lower mine workings with water, and allow ground water to return to an <br /> approximation of pre-mining hydrologic conditions. Detailed analyses of the hydrologic <br /> and hydrogeochemical impacts of the proposed bulkheads are discussed in Evaluation <br /> of Hydraulic and Hydrochemical Aspects of Proposed Bulkheads, Sunnyside Mine, San <br /> Juan County, Colorado dated March 12, 1993 by Simon Hydro-Search, Inc. <br /> To differentiate natural water chemistry from the chemistry of waters which have <br /> passed through the Sunnyside Mine it has been proposed that a tracer be placed in the <br /> mine workings so that waters which have passed through the mine can be identified <br /> as such. Bromide was selected as the best choice for a ground-water tracer (Simon <br /> Hydro-Search, Inc. and Tracer Research Corporation, 1993). <br /> The Colorado Department of Health has expressed concern over the use of bromide <br /> as a tracer. This report addresses those concerns. <br /> 1AADMINMMIANE\BROMIDE.RPT 2 <br /> H.I HYDRO-SEARCHAnC. A Tetra Tech Company <br />