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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 | 20 <br /> <br />Figure 4: Suggested Value of D based on excavation method (Hoek, 2000) <br /> <br />Figure 5: Values of constant mi for intact rock by rock group (Hoek, 2000)