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TABLE 2.7: CHARACTERIZATION METHODS <br /> Ore(Gypsurn) Greater than 850% gypsum as defined by a <br /> combined moisture test during exploration <br /> Pit backfill rock (Intraburden) See Waste Rock (Intraburden) <br /> Cap/cover materials (Growth Medium) I Visual observations and historical information <br /> 2.13'2 Approach/Procedure for Characterization <br /> During active mining, the rotomill grinds layers of gypsum and intraburden in approximately 6-inch <br /> layers. |ntraburden is typically intermixed with gypeunn, clearly identified by the distinct color <br /> variation. Gypaumn is vvhiha in color while introbunden is e darker tan/brown color. Equipment <br /> operators (reporting to the Mine Superintendent) are responsible for segregating materials into <br /> separate stockpiles within the active pit, which are loaded and hauled to American Gypsum's <br /> wallboard plant (gypsum) or used for progressive nadennation, access road construction, or <br /> stockpiled within inactive portions of the Lower Pit, Upper Pit. and East Pit for final reclamation <br /> (intnaburden/overburd*n). <br /> 2.13.3 Waste Rock (intraburden/Overburden) Management Plan <br /> Overburden is defined as material above the East Pit gypsum with little to no gypsum content, <br /> ranging in depth from 0 feet to 82 feet (using drilling data). Overburden would be removed during <br /> pre-production prior to active mining in the East Pit only. |ntnaburden is defined as inert, non- <br /> economic material to be removed during the East Pit and Upper Pit progression. <br /> 2~14 Quality Assurance Plan for Proposed Activities <br /> A Quality Assurance Plan (QAP) is included as Appendix C. The QAP covers activities associated <br /> with culvert installation (including bedding. baokfiUing, and erosion oortn]|s) and road <br /> construction. <br /> 2~15 Spill Contingency Plan <br /> Gypsum is processed into wallboard directly at the plant; there are no on-site processing facilities <br /> and therefore no processing chemicals or acid-producing materials used or stored at the Mine. <br /> During operations, care would be taken to ensure that no ni!, fuel, or lubricants are discharged <br /> onto the ground. Any spills or discharges would immediately be reported to the BLM, followed by <br /> prompt cleanup and nernadiatiVn. Spills would be reported and managed according toAmerican <br /> Gypsum's 8PCC Plan (Environmental Solutions, 2O19). <br /> 2~16 Monitoring and Inspections <br /> Monitoring (surface and groundwater quality and quantity, air quality, revegetation, stability, noise <br /> !eve|s, etc.) Would be conducted as required by existing approvals. <br /> Throughout operation, American Gypsum vvuu|d perform additional inspections according to <br /> Table 2.8. <br /> �s <br />