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SUMMIT ENGINEERING COI ENGINEERS & LAND SURVEYORS <br /> Mail: P.O. Box 1897 Alamosa, CO 81101 P: 719-589-6147 E: summitengco@gmaii.com <br /> Mining Plan <br /> This proposal for the Robins Rock Pit establishes three phases of development. <br /> Phase 1: Complete excavations in those areas within the existing pit boundary. <br /> Phase 2: Expand excavations to the West along the edge of mesa. <br /> Phase 3: Further expand operations northward into the mesa. <br /> The first phase of the Robins Rock Pit, as shown in the accompanying Mining Plan map <br /> in the previous exhibit, has already been stripped of"top soil," and mining excavations <br /> and deposit processing(s) are well underway. Materials being excavated undergo a <br /> cleaning process that will proceed as it has previously. All fine materials will be <br /> separated with a power screen, and this material will be added to the topsoil stockpile. <br /> The topsoil stockpile will be located in an area in the southeastern portion of the permit <br /> boundary near the location of the abandoned/filled irrigation pond as shown on the <br /> maps in the previous exhibit. Drilling operations in progress are based on a pattern of 3 <br /> feet by 5 feet drilled to a depth of approximately 18 feet. Drilling has resulted in a <br /> highwall along the north and west perimeter of the existing pit, so a barrier of large <br /> rocks has been placed along the perimeter to prevent livestock and human traffic from <br /> accidentally falling into the excavated area. This method will be used to protect any <br /> highwall areas that occur in the future as operations expand further. Both the loading <br /> area and rock processing areas are located at the bottom of the hill in the southeastern <br /> portion of the permit boundary mentioned previously. Product will be moved from the <br /> loading area to the nearby Conejos County Road H via an existing 20-foot wide gravel <br /> road. No further improvements to this haul road are anticipated. Mining operations are <br /> estimated to process approximately 50,000 tons per year. <br /> a) Mining in Phases 2 and 3 will commence in September, 2020 and should end by <br /> December, 2030. <br /> b) The operator commits to salvaging or importing fine materials from the Robins <br /> Gravel Pit (M-2002-014) for enough topsoil to replace 6 to 12 inches throughout <br /> the site during reclamation. This soil will be placed in separated stockpiles at the <br /> base of mesa in the southeastern portion of the site mentioned previously. <br /> c) There will be no overburden or waste rock after the initial topsoil is removed. <br /> d) It is anticipated that mining direction will be into the side of the mesa near the top <br /> cliffs of basalt rather than down into the ground. Excavation into the hill will be <br /> well within the permit boundary, and depth from the top of the hill should not <br /> exceed thirty (30) feet. Under no circumstances will excavation reach a depth <br /> below the surface of the irrigated field south of the permit boundary. <br /> Job # 1200710MP - A Page113of78 <br />