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RULE 4 PERFORMANCE STANDARDS <br />__.. _w.. , ~__,.~ ~~ _.-y - -,~,~. ~,..~-.~ <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 <br />2.04.4, but their locations were on the-northern side of Streeter Draw well over 500 feet from present <br />Colowyo 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 />4.20 SUBSIDENCE CONTROL <br />Colowyo is conducting a surface coal mining operation. Therefore, the requirements of 4.20 are not <br />applicable to the Colowyo operation. <br />4.21 COAL EXPLORATION <br />All coal exploration activities within the South Taylor/Lower Wilson permit revision area will be <br />completed in accordance with the requirements and procedures outlined in the existing permit document. <br />4.22 CONCURRENT SURFACE AND UNDERGROUND MIlVING <br />• Colowyo does not currently plan to have concurrent surface or underground mining activities; therefore, <br />the requirements of this Section aze not applicable to this permit application. <br /> <br />South Taylor/Lower Wilson-Rule 4, Page 28 Revision Date: 3/30/07 <br />Revision No.: PR-02 <br />