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• Surface Mine Backfill Areas <br />Several mine areas will be backfilled with overburden material to approximately <br />the ground surface (East Cresson Mine Area and Schist Island portion of North <br />Cresson Mine Area). Additional backfill will also be placed to cover the <br />highwalls in the Schist Island portion of the North Cresson Mine area. These <br />backfilled areas will be reclaimed in much the same manner as the OSAs. Slopes <br />on the backfill connecting to the surrounding terrain will be graded to an overall <br />slope of approximately 2.5H:1 V. Slopes will vary in steepness within this overall <br />slope to generate irregular landforms. Drawing F-1 and the financial warranty <br />calculations have been conservatively developed based on an overall 2.5H:1 V <br />slope criterion for all backfill materials. Portions of the Main Cresson backfill <br />will be graded and reclaimed at an approximate 2H:1 V slope due to placement <br />constraints. <br />Benches with varying widths, spacing, and grades may be developed along the <br />slopes to control erosion, facilitate access for revegetation, or provide sites for <br />tree and shrub plantings. <br />Growth medium will be used to cover the overburden placed as backfill to the <br />extent it is available. Section 11.2 discusses that about six inches of growth <br />medium is expected to be available to cover the areas upon reclamation. Other <br />• material containing fines will be used if stockpiled growth medium is not <br />available. The growth medium will be sampled to determine the need for <br />amendments. Vegetation will be established according to the revegetation <br />procedures presented in Section 11.3. <br />Backfilling is anticipated to occur to approximately the ground surface in the two <br />mine areas of the MLE: Schist Island portion of the North Cresson Mine Area and <br />the East Cresson Mine Area. Backfill has been rescheduled to cover the hi hwalls <br />in the Schist Island portion of the North Cresson Mine area The backfill <br />information presented in this discussion is based upon information available at the <br />time of submittal of this document. Actual backfilling may vary according to <br />economic and mining conditions, and other factors, over the life of the mining <br />operations. <br />Portions of Main Cresson Mine are expected to be partially backfilled as shown <br />Cripple Creek & Victor Gold Mining Company <br />Cresson Project Mine Life Extension <br />11-12 <br />0