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RULE 4 PERFORMANCE STANDARDS <br />4.19 Protection of Underground Mining <br />Colowyo will conduct no coal mining closer than 500 feet to any point of either an active or abandoned <br />underground mine. Underground coal mines have been operated in the past as discussed in Section 2.04.4, <br />but their locations were on the-northern side of Streeter Draw well over 500 feet from present Colowyo <br />mining. <br />The surface mining activities of Colowyo have been designed so as not to endanger any present or future <br />operations of either surface or underground mining operations. As discussed in Section 2.05.3, Colowyo <br />has engineered its mining plan to maximize recovery of coal by current economical surface mining <br />methods. <br />Rule 4 Performance Standards 4.19-1 Revision Date: 6/23/08 <br />Revision No.: MR-91