1984-01-12_PERMIT FILE - M1984008

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• MINING PLAN GENERAL The sand and gravel mining operation proposed in this lermit application will be a major disturbance. It is an expansion of the existing Barnhart Pit limited impact ( 110) permit io a regular ( 112) permit. The aggregates to be mined vary in thickness from 23 tc 27 feet averaging 25 feet and will be removed down to the unde lying shale, some 26 to 30 feet below surface elevation. Thl deposit contains approximately 2 .54 million tons of aggregate. (Pit run) Maximum anticipated mining rate will be 350,000 tons p r year resulting in a pit life of 7 .25 years. The exhibits a d timetables are predicated upon this extraction rate. he actual rate may vary from this due to market conditions and c stomer demand for the products. The sequence and relative ti ing presented in the plan will be followed. TOPSOIL • Topsoil within the affected area varies in thickness f om 0 to 84 inches averaging approximately 26 inches. All availab e topsoil will be removed from areas prior to any other disturba ce. This material will be stored in locations as shown on Map D 1 or, when possible, be placed in concurrent reclamation areas wi hout interim storage. Topsoil handling will be done with f ont-end loader and/or scraper. Topsoil in storage will be protected from erosion by d tching or berming around the sides of the piles. No material other than the immediate topsoil exists ov r the bearing aggregates. Therefore, no other stockpiles of non-product material will be required. MINING The high ground water level and proxiimity to the Arka sas River will yield a wet pit operation as demonstrated by prio oper- ations. Primary extraction will be done with a 1 -1 /2 ubic yard Northwest dragline. A minor amount of the aggregate m y be removed with front-end loaders. All final slopes will be left not exceeding a 3 to 1 slope. •