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• ZINC HILU#1 BED CONTACT HIGHWALL <br />Mine development from the crusher bin northwest along the main haul road resulting in a .25:1 <br />highwall contact which must be reduced to a 1:1 slope based on closure criteria. This highwall <br />removal would include the haul road accessing Gold Hill from the crusher site and would affect <br />700 feet of highwall northwest starting from the area of the truck tum around at the crusher bin <br />dump point. <br />Section 600 3000 tons <br />Section 700 3800 tons <br />Section 800 4200 tons <br />Section 900 5000 tons <br />Section 1000 5600 tons <br />Section 1100 6800 tons <br />Section 1200 7000 tons <br />Total tonnage 35400 tons <br />Following the same strike and direction, the next highwall contact: <br />SENATORE HILUHANGINGWALL CONTACT HIGHWALL <br />This is the exposed gypsum rock bedding at a nearly vertical attitude which has had the <br />hangingwall limestone removed to app. 30 feet below the actual hangingwall contact. This <br />• mining development work had prepared the entire Senatore Hill mining level for gypsum <br />extraction. Under closure criteria, the vertical face must be reduced to a minimum 1:1 rock talus <br />slope via drilling and blasting. The following tonnages are those rock volumes that would be <br />drilled and shot to attain this end result. <br />Section 1300 4000 tons <br />Section 1400 4000 tons <br />Section 1500 3800 tons <br />Section 1600 4000 tons <br />Section 1700 4200 tons <br />Section 1800 4000 tons <br />Section 1900 4500 tons <br />Section 2000 4000 tons <br />Section 2100 4000 tons <br />Total tonnage 36500 tons <br /> <br />