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5. Slope Design and Stability <br /> The Colorado Division of Reclamation,Mining,and Safety(CDRMS) mandates specific regulations to ensure the safety <br /> and environmental integrity of non-coal mining operations across the state. These guidelines,which include the widely <br /> accepted 2:1 slope ratio (horizontal to vertical),are designed to prevent slope failures that could jeopardize human safety <br /> and cause environmental damage. The CDRMS's comprehensive regulations also encompass engineering and safety mea- <br /> sures such as benching and terracing,adequate drainage systems to mitigate slope instability,regular site inspections,and <br /> detailed compliance documentation. These measures are essential for maintaining slope stability and ensuring the well-be- <br /> ing of both the environment and mine workers. dust,managing noise levels,and ensuring that all workers have access to <br /> necessary personal protective equipment. <br /> 5.1 Slope Ratio and Design <br /> The recommended slope ratio for the project is 2:1 (horizontal to vertical),as it offers both stability and economic efficien- <br /> cy in excavation,particularly suited to Colorado's soil conditions. Geotechnical assessments will guide the slope design, <br /> taking into account soil particle size,cohesion,and moisture content to ensure structural integrity and prevent slope fail- <br /> ure. <br /> 5.2 Legal and Regulatory Compliance <br /> The West Side Placer Project will adhere to state and federal regulations to maintain safe and compliant mining practices. <br /> These guidelines,established by the Colorado Division of Reclamation,Mining,and Safety,mandate specific slope angles <br /> and other safety measures to protect both the environment and workers.Additionally,industry-standard safety codes will <br /> be integrated,outlining engineering practices such as benching and terracing to enhance slope stability throughout mining <br /> operations. <br /> • State Regulations:Adhering to the guidelines set forth by the Colorado Division of Reclamation,Mining,and Safety, <br /> which mandate specific slope angles and other safety measures to ensure compliance and safeguard the environment <br /> and workers. <br /> • Safety Codes: Incorporation of state and federal safety codes that specify engineering practices such as benching and <br /> terracing to stabilize slopes during mining operations. <br /> 5.3 Implementation Techniques <br /> The slope design for the West Side Placer Project follows the CDRMS guidelines,with a standard slope ratio of 2:1 (hori- <br /> zontal to vertical)in general excavation areas and a steeper 1.5:1 ratio for deep pit excavations,as permitted under Rule 6.5. <br /> Engineering techniques such as benching and terracing are implemented in accordance with Rule 3.1 to enhance stability <br /> and manage surface runoff. These measures comply with the geotechnical stability standards required by Rule 6.5,ensuring <br /> the structural integrity of all excavated areas. <br /> • Benching and Terracing:These methods will be employed to enhance slope stability,manage erosion,and control <br /> surface runoff effectively. <br /> • Drainage Control: Designing and implementing comprehensive drainage solutions to manage water flow,prevent <br /> 7 <br /> HARDROCK/METAL MINING REGULAR(112)APPLICATION Au Pt Industries LLC I PO Box 1424-Edwards,Colorado 81632 1970 306 1 784 <br />