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Cross Gold Mine <br />December 2024 E-10 <br /> <br /> <br /> <br />Slopes will be reconfigured to Approximate Original Contour (AOC) or less and will blend in with the <br />surrounding topography or match the AOC. Table E-7 lists the reclamation areas of slopes steeper than <br />2:1 and 3:1. <br />Table E-7. Operations Area Slopes Steeper Than 2:1 and 3:1 <br /> Horizontal Surface Slope Surface <br />Zone Area Square <br />Feet <br />Acres Area Square <br />Feet <br />Acres % of total Average Slope <br />1 (flatter than 3:1 <br />within disturbance <br />area <br />123001.8 2.824 124578 2.860 68.8 12.8% <br />2 (between 3:1 and <br />2:1) <br />12953.6 0.504 23728.8 0.545 12.3 40.8% <br />3 (everything steeper <br />than 2:1) <br />33858.6 0.777 41595.6 0.955 18.9 69.6% <br />Total 178814 4.105 189902.6 4.360 <br />At the Idaho Tunnel hillside, the vertical slope is currently steeper than 3:1. However, as per approved <br />Technical Revision (TR) No. 9, the final reclamation of the hillsides will meet all slope requirements and <br />approximate original contour. If necessary, the stability of replaced topsoil on graded slopes will be <br />assured by roughing in final grading to reduce slippage zones. Runoff along slopes will be controlled <br />with erosion and sediment control structures to minimize rill and gully on slope. <br />Because this is an underground mining operation, there will be no highwalls to reclaim. No new portals <br />or declines are currently planned. The temporary sediment control measures implemented in <br />compliance with the mine Stormwater Management Plan will be maintained until DRMS certifies 70% <br />revegetation of applicable slopes. The sediment control measures associated with slopes will be <br />removed at that time. Grading will be conducted on the contour where it does not pose a safety hazard <br />to operators and equipment. <br />During site reclamation, Best Management Practice (BMP) storm water control practices will be in place <br />to control erosion and siltation. Slides and other damage should not be a factor because only small <br />areas will need to be graded. <br /> <br />The following mine components will remain after reclamation: <br />• Caribou Parking Area <br />• Potable Water Pipe <br />• Cross Parking Area <br />• Sanitary Water Pipe <br />• Subsurface Drinking Water Supply Line <br />• Caribou Management Office