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Memo to.PCPC, <br />Re:-,SUP No :1999-002 <br />September 13, 1999 <br />Page 12 - <br />Summary of Mining and Reclamation Plan <br />VVith a total thickness exceeding 30 feet, (actual thickness is variable due to <br />quality and erosion) the extraction of the Ft. Hays Limestone Unit will be <br />conducted by an open pit type operation. Mining activities will be conducted with <br />two shifts; per day, .based on an 8=hour shift period, with a six-day work-week. <br />Mobile equipment will be used `such as scrapers loaders, rock trucks, and water <br />trucks. An 8:26-acre box cut (1200 feet long by 300 feet wide by an average of <br />45 feet deep) will be completed to initiate the operation (See Exhibit 7 for <br />representation). This initial opening will remain open and contain the primary <br />crusher and conveyance system mostly below the normal surface elevation. <br />Overburden. and soil from this initial cut will be stored on-site and .stabilized to <br />prevent water and wind erosion.'. Erosion and sedimentation controls such as <br />impounds, silt fencing, and diversion ditches, will be established to prevent soil <br />erosion and siltation.of streams.' - <br />Mining of the Limestone and bottom sandstone will continue from this box cut in <br />a southerly direction. Production panels will be established running from <br />northwest to southeast along the formation strike (N49°W). The., dimension of the <br />weekly panels must be at least 24 feet wide by 600.feet long, using al 2'on <br />' center blasting pattern. It is anticipated that approximately 4,300 cubic yards of <br />soil overburden along.with.15,000 cubic yards of limestone will be removed in <br />weekly panels. The yearly panel dimension will be approximately 300 feet wide <br />by an average of 1800 feet long yielding about 1.5 million tons per year. The <br />total area affected by mining in a given yearwill be about 12.5 acres. <br />As the panels progress, topsoil will be removed from areas to be mined and <br />deposited in areas that.the limestone and sandstone have been removed from. <br />This 12.5-acre annual quarry area allows that less than 30 total acres of land will <br />he affected at any given time., <br />Prior to drilling and blasting, a scraper will -remove the soft organic surface soils <br />and subsoils to a storage area adjacent to the panel for easy reapplication to the <br />mined area. It is proposed that each 12.5-acre panel be fully reclaimed by <br />replacing the subsoil and surface organic soils or, the floor of the pit and <br />< reseeding with an approved seed mixtures. A roadway will remain open along <br />the length of the box cut panels to allow vehicle adcess to the active areas <br />during mining.