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the hole with soil material. <br />When mining is completed, the mine portals will be sealed to prevent access. Sealing <br />will involve fabrication of concrete block walls located a minimum of 25 feet inby the <br />portal openings. The outside surface of the block walls will be sealed with an MSHA <br />approved sealant to prevent <br />4.07 -1a <br />Revised 5/14/14 RN -06 <br />