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Geotechnical Stability Exhibit <br /> Engineering Evaluation of Highwall Design for the South Quarry of the Morrison Quarry <br /> <br /> January 2024 | 17 <br />Table 8 – Summary of Petrographic Analyses <br />Boring Sample <br />Depth (ft.) <br />Thin <br />Section <br />Depth <br />(ft.) <br />Rock Type <br />HDR-002 106.0- <br />106.6 106.4 Intermixed Granitic Rock with Muddy Sedimentary Material <br />HDR-002 112.0- <br />112.4 112.1 Intermixed Granitic Rock and Quartzite with Sandy Sedimentary <br />Material <br />HDR-002 225.0- <br />225.6 225 Biotite Gneiss <br />HDR-003 53.0-53.6 53.2 Biotite Gneiss <br />HDR-003 284.0- <br />284.5 284.2 Biotite-Chlorite/Serpentine-Talc Gneiss <br />HDR-004 66.4-67.0 66.2 Biotite Gneiss <br />HDR-004 383.0- <br />383.9 383.2 Tal-Biotite-Hornblende Schist <br />HDR-005 115.0- <br />115.7 115.1 Chlorite-Biotite Gneiss <br />HDR-005 191.0- <br />191.8 191.5 Biotite Gneiss <br />HDR-G1 Surface -- Gneiss with Intermixed Sedimentary Material <br />HDR-G2 Surface -- Biotite-Muscovite-Kaolinite Gneiss <br /> <br /> <br />