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FxhibirC <br />• years; however, exploration data indicate that the resource could potentially yield up to 100 years of <br />limestone reserves suitable for cement feedstock. Given the economic importance of the Fort Hays <br />limestone deposit and quantity of material available, Rio Grande expects to extend the life of mining and <br />processing beyond 50 years. Therefore, the mine plan prepared for this project incorporates the necessary <br />flexibility to accommodate future technological advances with respect to both mining and cement <br />production. <br />As discussed in Exhibit J, Vegetation Information, the site consists of flat rangeland with native <br />vegetation. The vegetation type is primarily short-grass prairie dominated by buffalo grass, blue grama, <br />and few low shrubs and forbs Ground cover was estimated at 60 percent grasses and approximately 10 <br />percent forbs in the summer of 2001. Observations made in the spring of 2002 suggest current ground <br />cover of 50 percent grasses and 10 percent forbs. Grazing has affected native vegetation in the project <br />area allowing the establishment of some weed species. <br />• <br />• <br />1180-Mine Perini[ Exhibits (Ju1.03.02)FNIAL C_2 <br />July 23, 2002 <br />