Laserfiche WebLink
equal to 3H:1V while excavator pull-down walls result in a sub-vertical highwall. The crest of <br /> mining highwalls will be knocked down with a dozer to create the final 3H:1V reclamation <br /> slope. New mining areas will be developed in 40 acre phases. Prior to initiating a new phase, <br /> the previous phases will begin reclamation. <br /> Raw gravel material is loaded into a portable crusher/screen plant where various sizes of product <br /> will be created and sorted into separate size-dependent stockpiles. Maximum processing is <br /> approximately 3,000 tons per day. The crushing operation and processed stockpile locations <br /> may change during the mine life as mining proceeds across the mining area. Stockpiles include <br /> gravel reserves for the Southway Construction Company as well as Alamosa County. <br /> Normal groundwater levels are known to be greater than 100 feet below the current pit floor. No <br /> water will be encountered in the operation. However, in the unlikely event that water is <br /> encountered during mining, excavation will immediately stop and the area will be backfilled with <br /> at least 2 feet of overburden to cover the exposed water. No pit dewatering will take place, as the <br /> groundwater table is below the bottom of the pit elevation shown on Maps C-1 and C-2. <br /> Mining activities are expected to occur approximately 4 to 6 months per year and processing <br /> operations will occur concurrently and include screening and crushing of gravel. Mining of the <br /> deposit will occur to the limits shown on Map C-2. Expected annual average production is <br /> 70,000 tons. Actual production rates will fluctuate based on market conditions. Raw material will <br /> be sold as various products: crushed rock, chips, road base, concrete, and asphalt. "Naturals" or <br /> sandy fines from the screening operation will be mixed into overburden and are expected to <br /> make up approximately 10% of the raw material mined. <br /> Used asphalt pavement and concrete rubble is also imported and stockpiled on site to be used for <br /> future crushing and stockpiling for use as a recycled material in new construction. Additionally, <br /> imported concrete and asphalt may be used in the base layers of backfilling and will be <br /> thoroughly covered with overburden and topsoil as per the Reclamation plan. Occasionally, soil <br /> that is determined to be free of debris and is inert is brought to the site and stockpiled for use <br /> during reclamation. Stockpiles of road base material and crushed rock used by Alamosa County <br /> are stored in piles in the southern mined extent of the site. <br /> Garrett Pit 4.ee l,cwicki aw!Asaocia�ea,PI.f.[' <br /> February 2018 D-2 <br />