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The deposit to be mined is a Miocene rhyolite expected to have a depth of>300 feet. Blasting <br /> and mining will reach a depth of approximately 8,300-foot elevation. This is below the pre-mine <br /> ground surface (Maps C-3 and F-I). Mining depths with respect to the highest undisturbed <br /> ground point are included on Tables 2 and 3. The highest pre-mining ground surface elevation is <br /> approximately 8,500 feet and the final post mine elevation is 8,300 feet. <br /> Table 2. Mining Depths, Phases 1 and 2 <br /> Starting Final Elevation <br /> Elevation Elevation Delta <br /> Bench tf (feet) (feet) (feet) <br /> 1 8400 8380 20 <br /> 2 8380 8360 20 <br /> 3 8360 8340 20 <br /> 4 8340 8320 20 <br /> 5 8320 8300 20 <br /> Table 3. Mining Depths, Phases 3 and 4 <br /> Starting Final Elevation <br /> Elevation Elevation Delta <br /> Bench It (feet) (feet) (feet) <br /> 1 8380 8360 20 <br /> 2 8360 8340 20 <br /> 3 8340 8320 20 <br /> 4 8320 8300 20 <br /> 6.4.4(f)(ii) <br /> The target rhyolite is underlain by Precambrian migmatitic gneiss; neither unit is sedimentary. <br /> 6.4.4(g) <br /> • <br /> • The primary material to be extracted is the green rhyolite stone for use as decorative stone, <br /> landscaping material, and pozzolan. Material will be crushed and further processed with respect <br /> Siskin Pit <br /> January 2024 D-7 Lcwicki & Associates <br />