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Exhibit C <br /> 1 Mining Plan (Rule 6.3.3) <br /> The purpose of this mining plan is to supplement the existing approved mining plan. The sections in this <br /> mining plan conform describe how mining will affect the permit area for the duration of the operation. <br /> This plan is correlated to Exhibit E—Maps 2, 3 and 4: <br /> This is an on-going mining operation. Based on known reserves and mining at 70,000 tons per year,the <br /> operation could produce for up to 50 years. We do not anticipate periods of intermittent mining activity. <br /> 1.1 Potosi Shaft and Caribou 300 Level Portal Openings <br /> The Potosi Shaft will be accessed on foot from the main mine site and the Caribou 300 Level Portal <br /> already has an access road. No new roads will be constructed to these facilities. These openings are <br /> being secured with fencing and hazard sign posting to prepare for future use. We anticipate using the <br /> Potosi Shaft as an airway or secondary escape route if and when underground work locates the opening <br /> underground and after we evaluate its use from an engineering and economic perspective. In the <br /> intervening time we will stabilize the opening and prevent shaft entry or approach by the public. <br /> Similarly,the Caribou 300 Portal will be stabilized and the opening secured to prevent entry or approach <br /> by the public as we evaluate future use. <br /> 1.2 Topsoil <br /> As shown in Exhibit B, Section 1.1, soil in the permit application areas is composed of mostly of a thin <br /> layer of loam underlain by cobbly and stony loam and weathered and unweathered bedrock except for <br /> the Cryaquolls,which are silty loams on relatively flat to gentle slopes(0- 15 percent slopes). Other soil <br /> types are present on steeper slopes and transition to cobbly and stony within approximately 3 to 5 <br /> inches. There is little soil that can be salvaged at this site. There are no plant growth medium stockpiles <br /> on the site. <br /> No topsoil stockpile construction is expected as part of this Amendment.Areas proposed for disturbance <br /> have previously been disturbed as part of the site's historic mining operations. If topsoil of sufficient <br /> quantity is found, it will be stockpiled so that rehandling is minimized. If soil is stockpiled,topsoil <br /> stockpiles will be field identified or marked. On occasion,topsoil may be added or removed from the <br /> topsoil stockpile to salvage or replace topsoil during mining operations. <br /> Topsoil will be removed from the site of the proposed leach field and placed adjacent to the leach field. <br /> Once the leach field is constructed,the topsoil will be replaced, prepared for seeding, seeded with the <br /> approved seed mix and mulched. (Please see Exhibit D, Section 1.9). Mulching will only occur if the <br /> activity may be conducted without resulting in safety concerns on slopes. <br /> 1 <br />