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<br />has a moderately high compressive strength, and rock fall will be capture at the base of <br />the highwall with appropriate grading, then no further information would a required for <br />approval of the highwall. If there are adverse fracture sets, then some de ree of physical <br />testing and limiting equilibrium slope stability analyses may be required. <br />Please contact me at the DMG Durango Office, 701 Camino del Rio, Rooi <br />CO 81301, phone 1970) 247-5469, if you have any questions. <br />Sincerely, ' <br />~~.~~~~- <br />Wallace H. Erickson <br />Environmental Protection Specialist <br />References: <br />DMG memo dated 7/31/00, RE: High wall Stability, Gunnision Grave% <br />Permit No. M-78-301. <br />Abe% J.F., 1996, Preliminary Open Pit Slope Design, Kelsey Lake Mine: in <br />Minera/s and Geology Files, Denver, Colorado, 46 p. p/us appendices. (So <br />and figuresl. <br />Call, R.D., 1986, Cost-benefit design of open pit slopes: in Annals 1" <br />Pit Mining, Antofagasta, Chile, 18 p. <br />Enclosurels) <br />cc: Allen Sorenson, DMG <br />125, Durango, <br />Pit, <br />.ion of <br />of tab/e <br />on Open <br />L <br />3 <br />