2005-08-11_REVISION - M1977424 - Laserfiche WebLink

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Logan Wash Mino TR No. 7 applying a minimum 6-inch layer of topsoil or subsoil to the disturbed surface. This soil will be seeded, fertilized, and straw mulched in the same manner as described for the Upper Access Road. Upper Bench Road and Lower Bench Road Since initial development of the mine, a significant amount of vegetation has naturally established itself along the margins of the bench access roads including the small I to 2 foot earth berms on the outside (fill side) of the roads. Recent evaluations of storm water control at the mine (Technical Revision No. 5) concluded that preservation of the bench roads is important to erosion control at the mine. The roads and accompanying toe ditches on the inside (cut side) of the road channel storm water away from and prevent erosion on the steep outslopes (fill and natural slope areas). The road benches themselves consist of bedrock and shallow fill. Where bedrock is present, the full width of the road bench is needed to manage potential storm runoff. On the basis of these conditions, OOSI proposes to rip the road surfaces where unconsolidated material is present to a depth of no less than 1 foot and apply a minimum of 6-inches of topsoil. The soil surface will be seeded with a range drill using the approved seed mix for the mine (Attachment B). Fertilizer will be applied at a rate of 200 pounds per acre with the seed or before final disking of the surface. A balanced 18-18-18 nitrogen, phosphorus, potassium Fertilizer will be used. Certified weed-free straw mulch will be applied at rate of 2,000 pounds per acre and crimped into the surface following seeding using a mechanical disc technique (tractor with disc). Straw mulch will be applied manually or by a mechanical spreader, whichever is most feasible. The following table shows the reclamation materials proposed for use on reclamation of roads. Road Reclamation Materials Material Application Rate Ibs er acre Seed mix (Attachment B) 17.5 Straw mulch 2,000 Fertilizer (18-18-18 N-P-K) 200 4,2.2 Mine Benches (Area #2, Area #3, and Area #4) The mine bench areas include Areas 2, 3, and 4 as shown on Exhibit F (Attachment A). Area 2 is the Upper Bench, Area 3 is the Lower Bench, and Area 4 is the bench associated with the Research Mine. These areas include the bench production/staging area as well as all other flatter-grade ground above the waste-rock dump slopes. The existing area of the Upper Bench is approximately 2.3 acres in size, including the moderately sloped area below the Daylight Portal. The existing azea of the Lower Bench is approximately 5.5 acres. Area 4, the Research Mine bench, is an area of approximately 0.8 acres not including the mine access road over the bench. Western Water 8 Land, lnc. 5