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The main processing area will be moved only to mine Phase 21. When this time comes, the <br /> processing area will be relocated to a previously mined phase adjacent to the main processing <br /> area or within the relocated rail loop. Location of the topsoil and overburden stockpiles, the <br /> processing area sediment settling pond and berms, the relocation of the rail loop, and drainage <br /> patterns as altered by the processing area move will all be addressed in a technical revision to the <br /> Division prior to any mining within the main processing area, also shown on Map C-2 as Phase <br /> 21. Additionally, movement of the processing area will require an amendment to the Huerfano <br /> County Conditional Use Permit as moving the rail loop will change the permit boundary of the <br /> CUP; the DRMS boundary will remain unchanged. <br /> Blasting and mining will reach a depth of approximately 30 feet below the pre-mine ground <br /> surface along the eastern extents of the mesa where overburden is minimal. Mining depths will <br /> reach approximately 90 feet deep along the western extents of the mesa as the target basalt sill is <br /> approximately 60 feet below the current ground surface and is covered by shale in those areas. <br /> Regardless of location, blasting and mining depths will reach the base of the basalt sill at that <br /> specific location. Prior to blasting, overburden will be pushed at a 3H:1 V slope to the adjacent <br /> area in reclamation. Blasting and mining will occur in 40 foot lifts until the target resource—the <br /> basalt sill — is reached. Therefore, the maximum active highwall will be 40 feet tall and 300 feet <br /> long after overburden is removed in a previous lift. New mining areas will be developed in <br /> approximately 15-25 acre phases that are detailed in Table D-1. The last mining phase, Phase <br /> 23, is only 10.8 acres and is constrained in size due to the nature of the permit boundary <br /> dimensions. It is anticipated that mining of phases will occur in numerical order; however, if test <br /> drill holes yield high shale and overburden thickness above the basalt sill, mining of deep <br /> resource phases (>80 feet to the basalt sill) may not occur until later in the mine life, if at all. <br /> Prior to mining a new phase, the advance phase will be stripped of topsoil and reclamation to be <br /> used in the previously mined phase for reclamation. <br /> Bradford Mesa Quarry (.n*,—xia s&d Assermwe.PJ AA <br /> January 2020 D-7 <br />