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EXHIBIT D <br />MINING PLAN (REVISED August 2004) <br />Mining will be accomplished in 6 phases as outlined below with stripping, backfilling, and quarrying <br />going on simultaneously. The overburden material consists of sandstone rock containing 50% SiOZ and <br />50% CAC03. This material does breakup and will generate considerable fines which will aid in <br />subsequent revegetation. The underlaying bed is again sandstone rock with the same chemical <br />composition as that of the overburden. The parting plane between the limestone and the underlying <br />sandstone is clearly defined, which results in a smooth hard floor after the limestone is removed. This <br />would be very close to the existing terrain which is rock outcropping. <br />Conventional open pit quarrying methods will be used in this operation. Both the sandstone overburden <br />and limestone will be drilled and blasted. The shot rock will then be loaded and hauled to the crushing, <br />screening, and stockpiling area. Necessary roads will be constructed as required to provide access to the <br />mining operations. The roads will be constructed primarily with the overburden material and covered <br />with 3" to 12" of 3/4" minus limestone. Roadways will not need to be constructed outside the disturbed <br />area and will be graded, covered or scarified to facilitate revegetation. <br />EXHIBIT D. (REV) MINE PLAN, ROBERTS QUARRY Aug. 2004, PAGE 1 OF 4 <br />