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<br /> <br />CAPON DOLOPIITE QUARRY 77 37(0 <br />EXFIIBIT D - DIINING PLAN <br />Metallurgical dolomite with a true thickness of approximately 90 ft <br />lies at a dip slope of approximately 18°. The overburden is 0-2 ft thick <br />and is an alluvium material. The footwall consists of dolomite (Fremont <br />formations) and quartzitic sandstone (Harding formation). <br />The Quarry (Area 3 in Exhibit C) is worked from the top down in 28-ft <br />benches. Each bench takes about four years to work out. <br />The benches are constructed by drilling and blasting. Drill patterns <br /> <br />consist of 4-3/4" rotary drill holes in a 10' x 10' pattern. Holes are <br />usually shot straight on unless the shot pile needs to be placed in a <br />certain location in which case a "V" pattern or en echelon can be used. <br />The holes are loaded with a water-gel slurry as the bottom load with AN FO <br />as the top load. Electric blasting caps with 40-ft leg wires are used <br />to initiate shots with 25 ms delays between rows and SO ms delays between <br />the next-to-last and last row. <br />After blasting, the shot rock (dolomite) is loaded into 7 cu yd <br />C~ <br />haul trucks by a lz cu yd Bucyrus-Erie 38-B shovel and hauled to a screening <br />facility, (Area 6 in Exhibit C) which is located on the Quarry floor. <br />here the stone is crushed and screened into two products, a 4" x 2" and <br />a 2" x 3/8". The screened product is then hauled about two miles to a <br />railroad loading point for shipment to Pueblo. The -3/e" fine material <br />is discarded and placed on a fines dump in Echo Canyon (Area 5 in Exhibit <br />C) just north of the screening facility. Culverts will be installed / <br />beneath the dump to insure proper drainage when needed. <br />