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2019 Plan of Operations Modification American Gypsum Company, LLC <br /> TABLE 6.3: SOIL,WASTE,AND MINEABLE MATERIAL SUMMARY <br /> Thickness Quantity Details on Use, Stockpiling, . <br /> Material (feet) (Million Method of Disposal <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 Pit Access <br /> Overburden (East Pit) assumed 2.1 Road (overburden removal would be <br /> average 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 reclamation <br /> Mineable Material Varies Gypsum used at American Gypsum's <br /> es 6. <br /> (Gypsum)—Upper Pit[3] 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: M Calculated volumes converted to tonnages using 100 pounds per cubic foot(pcf)for growth medium and <br /> 130 pcf for overburden, intraburden,and gypsum. <br /> [2)Upper Pit material summaries do not include mining the Upper Pit to the approved limits, assumed to <br /> correlate with a pit floor elevation of 6900 feet amsl. Material summaries include development associated <br /> with the proposed Upper Pit expansion below 6900-foot elevation. <br /> 6.9 Exploration Operations <br /> Drilling was performed in 2006 to determine the estimated depth to 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 (access, drilling methods/drill refusal), the maximum gypsum depth <br /> within the Upper Pit and East Pit is unknown; additional drilling may be performed as the Upper <br /> Pit and East Pit depths progress, within the approved pit disturbance limits, to refine the pit <br /> layouts. Additional drilling would be performed using rotary or coring methods, 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 /> boreholes and sampling for geotechnical data. Drilling permits (including drill hole plugging and <br /> reclamation) would be obtained prior to drilling and drill holes would be plugged in a manner <br /> appropriate to water conditions encountered during drilling as described in Section 7.1. Potential <br /> areas for additional exploration drilling are identified on Drawings 06 and 08. <br /> Am Gypsum Poo Mod ISSD 20190909 September 2019 [281 <br />