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Received <br />MINING PLAN APR p 1 2002 EXHIBIT D <br />Divisl~ ol~ FieAy DNice <br />erg g Geology <br />Up to the permit amendment in 2002, the permit allowed sand and gravel mining in the River itself. <br />r1 <br />The 2002 amendment was made to allow one-time mining of an adjacent terrace to form a lake next <br />to the river and reclaim three existing abandoned water treatment lagoons in the lake area. There- <br />fore, the mining plan has been divided into two sections -river mining and lake mining. The entire <br />revised permit area is 34.81 acres. The breakdown of this acreage is given below: <br />Area Description Acreage <br />1. Extraction area in river 1.51 <br />2. Non-extraction area in river 7.03 <br />3. Undisturbed riverplain at southeast comer of permit area 0.24 <br />4. Lake extraction area 4.74 <br />5. Yard area, processing, stockpiles, on-site roads, topsoil, sediment sump, riverbank 21.29 <br /> <br />Total 34.81 <br />1. General Plan- River Minint=. <br />Normal operation has been based on allowing spring thaw flows and summer thundershowers to <br />deposit gravel in the west channel and partially fill in the main dredge hole also located in the west <br />channel of the River (west of the dike) with gravel material. When flows were reduced in the late <br />fall or early spring, the low flow of the river was directed to the east channel and gravel harvesting <br />occurred in the west channel. The dredge hole has been filling in at a greater rate since mining <br />stopped in 1998 but portions of the hole are still approximately 10 feet deeper than the bottom of <br />the channel. At one time, the hole was 50 feet deeper than the channel upstream and downstream. <br />As explained in the Introduction, this hole was the result of old gold dredge which operated on the <br />Thomas Pit 2/02 6 <br />