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CM T <br /> QSAKE, INC. TECHNICAL <br /> r�11wkftko Ee�iaam d Cenw.di�r•Vmcr d+ , S E R V I C E S <br /> June 29, 2022 <br /> Mr. Bill Tezak <br /> Colorado Quarries, Inc. <br /> 270 South 15th Street <br /> Canon City, CO 81212 <br /> Subject: High Wall Stability Study <br /> Silver Cliff Obsidian Quarry <br /> Silver Cliff, Colorado <br /> Project No. 22.6084 <br /> Dear Mr. Tezak: <br /> A CMT Technical Services, Inc. (CMTTS) engineering geologist visited the Silver Cliff obsidian quarry <br /> located about 0.5 miles north of the Town of Silver Cliff, Colorado off Emery Street (Exhibit 1) on <br /> June 16, 2022 to address the highwall slope stability. <br /> Obsidian Quarryy Legend <br /> '� 03 <br /> 3 <br /> d- <br /> ,7�', '"r P, :, ; �,v .• to <br /> {r, <br /> r <br /> EXHIBIT 1. Vicinity map of the obsidian quarry project. <br /> SUMMARY <br /> 1. The high wall area of the obsidian quarry is an east-west striking cut face. The main <br /> fracture sets include northwest dipping, southwest dipping, and a vertical fracture set. <br /> The intersection of the fracture sets and the high wall cut face are stable (no wedge failure <br /> Corporate Office: 7108 South Alton Way, Building B Centennial,CO 80112 <br /> Locations: Centennial Frederick Silverthorne Salida/Crested Butte <br /> Phone 303-220-0300 www.cesareinc.com <br />