Laserfiche WebLink
E. Ventilation Shafts <br />All surface structures at the ventholes will be removed. The cement pad will be <br />broken up and placed in the shaft. Then the shaft will be plugged using either <br />polyurethane foam with a thickness of 10 feet, or concrete with a thickness of 3 <br />feet, placed far enough down the hole that a minimum of several feet of mine <br />waste and one foot of soil cover can be placed on top of this plug. This cover <br />material will be slightly mounded so that after natural compaction there will be no <br />depression remaining to collect surface water. This area will then be scarified and <br />seeded. <br />F. Berms and Ponds <br />All rainwater containment structures will be left in place in order to discourage <br />contact with the waste rock and ore pad. All retention ponds will be seeded; <br />ditches will not be seeded. <br />G. Utilities <br />Portable toilets, water storage tank, generators and air compressor will be hauled <br />offsite. <br />Transformer stations and power lines are the property and responsibility of the <br />San Miguel Power Association. <br />H. Waste Rock Pile <br />The waste area configuration will be changing on an ongoing basis during mine <br />operations; therefore, less earth work will be required at the end of the mine life to <br />achieve the final contours. Maps F -1A & B show the final grading for the site. <br />Final grading of the waste area embankment will include grading the remaining <br />angle of repose slopes to 2H:1V or less steep, and providing proper drainage for <br />all areas. During ongoing mining operations, approximately 5,000 cy will need to <br />be re- graded. This will also be necessary at the end of the mine's life. The final <br />contours are shown on Map F -1 A and the cross sections are shown on Map C -3. <br />The waste embankment will be pocked after final grading has been completed. <br />This will encourage vegetation growth on the slope by capturing water and <br />holding snow in the winter months. Also, the pocking will prevent rills from <br />forming on the slope during storm events. <br />I. Ore Stockpile <br />All ore will be removed prior to reclamation. SPLP tests have shown that the ore <br />material onsite has the potential to leach radionuclides; therefore, the 2.0 feet of <br />E -4 <br />