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TABLE2.3: SOIL,WASTE,AND MINEABLE MATERIAL SUMMARY <br /> From 3 inches to Salvageable material would be <br /> Growth Medium 2 feet; assumed 0.4 stockpiled in locations shown on <br /> average of Drawings 06 and 08 (if necessary) and <br /> 6 inches used for progressive reclamation <br /> From 0 to 50 feet, Used to construct the East PitAccess <br /> Overburden (East Pit) assumed average 2.1 Road (overburden removal would be <br /> of accessed via existing roads until the <br /> 20 feet East Pit Access Road is constructed) <br /> Material used for Upper Pit progressive <br /> reclamation, access road construction, <br /> Intraburden-Upper pit[21 Varies 10.0 or placed/stockpiled within inactive <br /> portions of the Lower Pit and Upper Pit <br /> for final reclarn ati on <br /> Mineable Material Gypsum used at American Gypsum's <br /> (Gypsum)-Upper Pit[31 Varies 6.7 <br /> plant to manufacture wallboard <br /> Material used for East Pit progressive <br /> reclamation, access road construction, <br /> Intraburden - East Pit Varies 19.7 or stockpiled within inactive portions of <br /> the Upper Pit and East Pit for final <br /> reclamation <br /> Mineable Material Varies 13.2 Gypsum used at American Gypsum's <br /> (Gypsum)- East Pit plant to manufacture wallboard <br /> Notes: w Calculated *olum*o converted to ton nageo using 110U pounds per oubic foot(pof)for growth m*dumand <br /> 130pcf for overburden, intrebmniem.and gypsum. <br /> [21 Upper Pit material summaries do not include mining the Upper Pit to the approved limits,assumed to <br /> correlate with a pit floor elevation nf030O feet ams|. Material summaries include do*e|npmentassociated <br /> with the proposed Upper Pit expansion below 080O-footelevation. <br /> 2.9 Exploration Operations <br /> Drilling was performed in 2006 to determine the estimated depth of overburden in the East pit <br /> and the approximate extents and depth of gypsum in both the Upper Pit and East Pit areas. Due <br /> to limitations during drilling /am:esS, drilling nnathode/dh|| refuaa|\. the maximum gypsum depth <br /> within the Upper Pit and East Pit is unknown: additional drilling may be performed aothe Upper <br /> Pit and East Pit depths progreS9, within the approved pit disturbance |irnite, to refine the pit <br /> layouts. Additional drilling vxOu|d be performed using rotary or coring rnethodo, with borehole <br /> diameters varying from 3 to 8 inches and depths up to 200 feet. Drilling campaigns would include <br /> up to 100 holes per drilling program, and holes would be plugged as soon as practical after drilling, <br /> resulting in as many as 20 open holes at any given time. Drilling programs may also include <br /> boneho|em and sampling for geotechnico| data. Drilling permits (including drill hole plugging and <br /> reclamation) would be obtained prior to drilling and drill holes would be plugged in o manner <br /> appropriate to water conditions encountered during drilling. Potential areas for additional <br /> exploration drilling are identified on Drawings 00 and O8. <br /> zz <br />