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EXSIBIT D MIIiI11G PI.iAN Alpine Rock Company will erect a portable at the northwest end of the site. They gravel and haul finished product from the gravel processing plant will crush and screen site. The grave] supply exists in placer tailings stockpiles created by previous gold/silver mining. Gravel stockpiles vary in height but are approximately five to 15 feet high. The stockpiles will be removed to a depth that ties in with surrounding grades. The material ranges from cobbles to small gravel. There will be no excavation of material below the original ground level. Work will occur in previously disturbed areas along the Swan River. No mining activity will occur in the river or associated wetlands. Gravel will be moved by loader and trucks from the immediate stockpile area to the plant site. Processed material will be hauled off-site as the market dictates. Bulk fuel will be stored in a tank on-site outside the 100 year floodway. The majority of flood flows will be contained within the river channel. No diversions or impoundments will be needed. Existing roads will be used for all travel to and from plant sites. After one stockpile area has been exhausted, the area will be graded. The plant site will then be moved to process gravel in the next area. The site will be mined in 17 Phases allowing one to two years per phase for a total of approximately 20 years. Market demand will dictate time required for extraction. Mining will progress in the directions shown on Exhibit C. Mine areas will vary in size from five to ten acres. Major Disturbance The entire site is in a state of "major disturbance" due to the tailings stockpiles in the floodplain of the Swan River. Mining the gravel stockpiles will not create major disturbance. Moderate Disturbance Plant Site and Product Stockpiles 2 acres Internal Haul Roads 2.5 acres Mine Area 10 acres M'n r.Disturbance None '!O'P~I. DISTIIRei\IICE 14.5 11CRES D-1