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999 'll <br /> GNdw Associefts Ina A <br /> 200 Union Boulevard.Suite 500 = = ld� <br /> Lakewood,CO USA 80228 �_ nW <br /> Telephone(303)980-0540 tWs <br /> Fax(303)985-2080 <br /> �uary 9, 1996 Our Ref: 933-2713.005 <br /> Sunnyside Gold Company M_ 7 7 — J 7 U <br /> P.O. Box 177 <br /> Silverton, Colorado 81433 <br /> Attention: Mr. William Goodhard Resident Manager <br /> RE: ,,ZESIGN CONCEPTS FOR CLOSURE OF THE LONGFELLOW KOEHLER <br /> MINE COMPLEX <br /> Dear Bill: <br /> Introduction <br /> Pursuant to our telephone conversation on January 3, 1996, concerning the design concepts <br /> for closure of Longfellow Koehler Mine Complex, Golder Associates Inc. (Golder) is <br /> pleased to present the following discussion of reclamation and passive treatment. <br /> Site Conditions <br /> Our current understanding of the site includes the following. <br /> The site consists of the Koehler Shaft and Portal, and the South Portal. <br /> The two portals are potential sources of acid drainage. The flow rates <br /> from the portals are unknown. <br /> Waste rock dumps lie adjacent to the Koehler Shaft and the South <br /> Portal. The waste dumps are sources of acid drainage due to reaction <br /> with surface water flow and direct precipitation. <br /> There is a surface water pond at the site which lies between the two <br /> waste rock dumps. <br /> The site is located at an approximate elevation of 11,160 ft. <br /> Closure Design Concept <br /> The closure approach for the Longfellow Koehler Mine complex is to reduce infiltration <br /> into the mines and waste rock dumps through surface water diversion, barrier layers, and <br /> reclamation. Following completion of the reclamation, residual seepage will be collected <br /> and routed through a three step passive water treatment process. The objective is to <br /> minimise acid drainage at the source, and passively treat the remaining seepage. <br /> OFFICES IN AUSTRALIA,CANADA,GERMANY,HUNGARY,ITALY,SWEDEN,UNITED KINGDOM,UNITED STATES <br />