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_ �4 ti <br /> ,ate <br /> Y <br /> �.,. - <br /> J I r. <br /> L A <br /> Photo 2-2. Mafic dike as observed in the Central Quarry. <br /> 2.2.2 Structure <br /> The dominant bedrock structure throughout the South Quarry and the West Quarry is the <br /> undulating, sub horizontal foliation within the gneissic materials. The foliations are cut by <br /> numerous near-vertical joints as well as mafic dikes and isolated faults. <br /> Faulting <br /> An assumed fault/shear zone has been mapped near the Morrison Quarry and through the <br /> footprint of the South and West Quarries on published geologic maps (Scott, 1972) and is <br /> shown in Figure 2 and Figure 4 in the figures section of this report. Although this <br /> interpreted fault trace is not directly observed at the mine, other fault traces have been <br /> documented in previous geological field mapping and in samples collected during subsurface <br /> explorations. The faults are Precambrian in age and are not active. <br /> Faults are observed in the South Quarry highwalls on benches at El. 6,700 and El. 6,760. <br /> Where exposed, the fault dips at approximately 70 degrees (°)below horizontal to the south <br /> and an associated zone of weak rock and metasomatized gneiss extends approximately 150 ft <br /> on either side. Other observed and mapped faults typically have moderate (— 35°) dips to <br /> north and south, striking generally east-west and are visible in the South Quarry highwall. <br /> 7 <br /> Aggregate Industries—Morrison Quarry GEI Consultants, Inc. <br /> AM-07 Geotechnical Stability Exhibit November 2020 <br />