2002-02-07_REVISION - M1976020 (7)

Home Browse Search

MINING PLAN EXHIBIT D Up to the permit amendment in 2002, the permit allowed sand and gravel mining in the River itself. The 2002 amendment was made to allow one-time mining of an adjacent terrace to form a lake next to the river and reclaim three existing abandoned water treatment lagoons in the lake area. There- fore, the mining plan has been divided into two sections -river mining and lake mining. The entire revised permit area is 40.78 acres. The breakdown of this acreage is given below: Area Description Acreage 1. Extraction area in river 1.51 2. Non-extraction area in river 7.03 3. Undisturbed riverplain at southeast corner of permit area 0.24 4. Lake extraction area 4.74 5. Yard area, processing, stockpiles, on-site roads, topsoil, sediment sump, riverbank 27.26 Total 40.78 1. General Plan- River Mining Normal operation has been based on allowing spring thaw flows and summer thundershowers to deposit gravel in the west channel and partially fill in the main dredge hole also located in the west channel of the River (west of the dike) with gravel material. When flows were reduced in the late fall or early spring, the low flow of the river was directed to the east channel and gravel harvesting occurred in the west channel. The dredge hole has been filling in at a greater rate since mining stopped in 1998 but portions of the hole are still approximately 10 feet deeper than the bottom of the channel. At one time, the hole was 50 feet deeper than the channel upstream and downstream. As explained in the Introduction, this hole was the result of old gold dredge which operated on the Thomas Pit 2/02