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Bureau of Land Management Appendices <br /> Royal Gorge Field Office DOI-BLM-CO-F020-2020-0036 EA <br /> The obsidian is a massive deposit,with minimal At any point <br /> natural fractures.No predominant fracture in time the <br /> patterns or sets have been observed, and there is visual <br /> no stratification.The expanded pit is planned to inspection <br /> be mined in levels,with highwalls alternating documents <br /> with benches. Benches will be 10 ft wide highwall <br /> minimum,which is considered sufficient to instability, <br /> catch any raveling rock. The final highwalls will BLM will <br /> be 40(vertical)ft apart, with a slope surface of require a site <br /> 1H:IV,which is considered more than adequate specific <br /> to eliminate any raveling or movement of this engineered <br /> type of deposit. The overall slope of the pit, geotechnical <br /> e. Geotechnical re considering highwalls and benches,will be a Y N N report ort to <br /> stable 1.25H:1.OV. verify the <br /> Colorado Quarries, Inc has actively mined this stability of <br /> pit for the past 40 years. During this time the material <br /> vertical high walls have been exposed with no for a working <br /> slope failures. The geological makeup of the slope of 1:1 <br /> obsidian deposit has revealed no seams or slip and final 2:1 <br /> planes.All vertical walls have remained stable slope. This <br /> and there have been no safety issues. will be a <br /> The proposed final highwall configuration will stipulation <br /> be sloped,not vertical, and will be constructed attached to <br /> with horizontal benches to catch any raveling the issuance <br /> rock for long-term stability. of the <br /> f Cell phones will be used, between personnel contract. <br /> Communications onsite and for contacting offsite parties. This is _ N N <br /> system a surface mining operation, located close to - <br /> town with reliable cell phone service. <br /> g. Utilities All power needs will be supplied by the <br /> (include operator's diesel-powered generator and - N N - <br /> A-4 <br />