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• 3.2 TOPSOIL REMOVAL AND STORAGE <br />See section 2.2.5 for the topsoil to be removed for the waste rock disposal area. <br />No topsoil was salvaged from the existing disturbances. During the life of the <br />mine minor amounts of soil sloughed off of the haul road slopes. This soil has been <br />stored in the topsoil stockpile area; as well as, on the mine bench (Figure 2.2-1). This <br />material is not topsoil but the Operator was permitted to store the material in the topsoil <br />stockpile area because analysis indicated it was suitable for reconstructive material. <br />Since no actual topsoil was salvaged, this material is the same as the material <br />that will be exposed when the road and mine site area re-contoured. The material <br />exposed at the surface of the mine disturbances has proven the ability to support <br />vegetative growth. The Operator will use the material that is stored in the topsoil <br />stockpiles on the mine site area. The topsoil and top dressing material will be also be <br />used as top dressing in areas where excessive rock is exposed on the surface after re- <br />contouring. <br />n <br />LJ <br />3.2.1 Depths of Suitable Topsoil Available for Reclamation <br />See section 2.2.5 for the topsoil to be removed for the waste rock disposal area. <br />The depths of material available for reclamation at the Munger Canyon Mine are <br />listed in Table 3.3.1 by map unit. The table lists the map unit, components of the map <br />unit, percent of map unit, horizon depths and ratings, recommended depth of stripping <br />and restrictive features. <br />Eight map units occur in the Munger Canyon affected area. Of these, six are <br />recommended for salvage (Table 3.2-1), including Glendive sandy loam (salvage to 24 <br />inches), Havre loam 0 to 6 percent slopes (salvage to 24 inches), Havre loam 2 to 8 <br />percent slopes (salvage to 24 inches), Nihill loam 5 to 35 percent slopes (salvage to 18 <br />inches), Rivra loam variant 0 to 8 percent slopes (salvage to 12 inches), and <br />Torriorthents 15 to 65 percent slopes (salvage to 6 to 18 inches as depths and slopes <br />permit). Units not recommended for salvage are Alluvial land (soils too thin and coarse) <br />and Rock Outcrop (soil mostly nonexistent). <br /> <br />3-4 <br />08/03 <br />Permit Rertewal <br />