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(Permit Number M2001008). During final backfilling and grading of the sediment basins, slopes <br />will be graded to at least 3H:1 V. <br />Due to the timing and variability in available backfill for reclamation, Cells 2 and 4 and Cell 3 <br />will be reclaimed as groundwater lakes. As mining in the cells and side slope reclamation is <br />completed, the lakes will be allowed to fill, reducing the overall disturbed area. As additional <br />backfill material becomes available, the lakes will be backfilled and the groundwater lake area <br />will be reduced. It is anticipated that no more than 100 acres of groundwater lake will be <br />created. This area may be less depending upon the availability of backfill materials and the <br />mining operation schedule. Slope grading and backfilling for reclamation will be done <br />concurrently with mining. Slopes will be graded to a minimum 3H:1 V slopes. Once backfilling <br />and grading has been completed in an area, the area will be seeded as soon as practicable (based <br />on first available seeding season). <br />In order to gain an understanding of the extent of the mining operation, it is helpful to know the <br />acres disturbed by different aspects of the mining operation. Each aspect is listed in the <br />following table with associated disturbed area. The table illustrates a point in time when the <br />mining disturbance will be at its maximum. This occurs during the mining of Cell 4, prior to <br />mining in Cell 5. The mining disturbance will be at its greatest when the northern portion of <br />Ce114 has been mined out and the mining face is nearing the southern portion of the cell. At this <br />time, Cell 1 will be backfilled and the exterior walls of Cell 2 and Cell 3 will be graded and <br />seeded for the creation of groundwater lakes. Portions of Cells 2, 3, or 4 may also be in use as <br />sedimentation basins. Although reclamation along the exterior walls of Cell 4 will be in <br />progress, the mining face will at its greatest length. <br /> <br />As ect <br />Minin O eration Disturbed Area <br />acres <br />A Stri ed overburden and to soil in antici ation of minin 30 <br />B Active minin face with 1/2H:1 V slo e, 1000 ft x 20 ft 0.5 <br />C Exterior cell wall being backfilled and graded to 3H:1 V side slopes, <br />1000 ft x 65 ft <br />1.5 <br />D Top of slope and side slope above lake water level to be seeded, <br />1000Rx60ft <br />1.5 <br />E Roads and conve ors 1.0 <br />F Process ]ant site, office, and scale house 18.0 <br />TOTAL DISTURBED AREA 52.5 <br />Pla#e Malley Opera Non <br />OMG !12 Permit Amendmenf <br />Page 7 <br /> <br />