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activities will occur. The table below summarizes the approximate timing in the mining areas <br /> and will vary depending on the nature of the deposit and market demands. <br /> YEAR MINING RECLAMATION <br /> 1 Phase 1 -- <br /> 2 Phase 2 -- <br /> 3 Phase 2 Phase 2 concurrent <br /> 4 Phase 2 Phase 2 concurrent <br /> 5 Phase 2 Phase 2 concurrent <br /> 6 Phase 2 Phase 2 concurrent <br /> 7 Phase 2 Phase 2 concurrent <br /> 8 Phase 2 Phase 2 concurrent <br /> 9 Phase 2 Phase 2 concurrent <br /> 10 Phase 2 Phase 2 concurrent <br /> 11 Phase 2 Phase 2 concurrent <br /> 12 Phase 2 Phase 2 concurrent <br /> 13 Phase 3 Phase 2 <br /> 14 Phase 3 Phase 2/Phase 3 <br /> Concurrent <br /> 15 Phase 3 Phase 3 Concurrent <br /> 16 Phase 3 Phase 3 Concurrent <br /> 17 -- Phase 3 <br /> 18 -- Phase 1 <br /> As discussed above, the ultimate timing will depend on market demand. The estimated times <br /> presented herein assumed mining occurs uninterrupted at a consistent pace. <br /> (fJ Use Mining Plan Map in conjunction with narrative to present: <br /> (i.) Nature, depth and thickness of the deposit and thickness and type of <br /> overburden to be removed <br /> Exploratory borings drilled at the site primarily in the Phase 2 and Phase 3 mine areas <br /> encountered approximately two (2)to twenty-two (22) (averaging nine (9))feet of <br /> overburden. The overburden described in the boring logs grades from clayey silt to silty <br /> sand. The overburden overlies approximately five (5)to twenty-seven (27) averaging <br /> nineteen (19)feet of sand and gravel overlying shale bedrock. The overburden is thickest <br /> on the southwest part of the site in an area that will not be mined. The bedrock depths <br /> encountered in the borings ranged from twenty-six (26)to twenty-nine 29) below the <br /> ground surface. <br /> (ii.) Nature of the stratum immediately beneath the material to be mined in <br /> sedimentary deposits <br /> The Site is located approximately 35 miles east of the eastern flank of the Rocky <br /> Mountain Front Range. Younger sedimentary strata dip eastward off the Pre-Cambrian <br /> igneous and metamorphic rocks that form the core of the Front Range. <br /> Martin Marietta Materials—Thunderbird Sand and Gravel—MLRB 112 Permit Application <br /> Exhibit D-4 <br />