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blasts will not result in a failure and comply with the limitations of 4.08.4(10) at a 95 <br />percent level of confidence. (4.08.6(2)). <br />VII. Disposal of Excess Spoil <br />There is no permanent disposal of excess spoil proposed for the New Horizon Mine. <br />During excavation of the initial box cut in 1993, spoil was stockpiled adjacent to the <br />support facilities area in the southeastern corner of the permit area. This spoil will be <br />loaded and hauled for use as backfill in cuts at the western end of the mine area. <br />VIII. Coal Mine Waste Banks <br />There are no coal processing facilities nor are any proposed at the New Horizon Mine 2. <br />All of the coal is transported to the power station by a transportation contractor. No coal <br />mine waste banks are proposed for the New Horizon Mine. <br />IX. Coal Mine Waste <br />Reject rock from a rotary breaker at the power plant may be transported back to the mine <br />site and deposited at the pit at least 10 feet below the subsoil level. <br />X. Backfillin2 and Grading <br />A. The Division has approved the applicant's plan for disposal of acid - forming or toxic <br />materials in a manner designed to prevent contamination of ground or surface waters <br />(4.14.3(1)(a)). <br />B. Since this is a truck and shovel operation, backfilling and grading of the overburden <br />occurs simultaneous with overburden removal. The generation of excess overburden is <br />not anticipated. Map 2.05.3 -1 gives a cross - sectional view of the typical mining <br />process. <br />C. Permit details on Backfilling and Grading are provided in Section 2.05.4(2)(c). The <br />proposed post- mining topography is depicted on Map 2.05.4 -1. This map also <br />includes a series of cross sections which provide comparisons of the pre- mining <br />ground surface with the proposed post- mining elevations. <br />D. With PR-6, WFC compiled a detailed backfilling sequence for the remainder of the <br />mine area. The plan is graphically illustrated on Map 2.05.3(3) -1 -2, which correlates <br />with mass volumes tabulated in Attachment 2.05.4(2) -7. Overburden generated from <br />excavation of the first box cut was stockpiled at the southeastern corner of the Mine 2 <br />permit area, south of the support facilities. This stockpile will be used to offset <br />deficits in backfill material that would otherwise occur in the final series of cuts at the <br />western limit of the permit area. <br />.• <br />