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XIX. Coal Exploration -Rule 4.21 <br />Coal exploration outside the Permit boundary is authorized by other than this Permit, and is not <br />addressed in this Finding. Coal exploration activity (resource confirmation) is found to be in <br />compliance with applicable portions of Rule 4.21. <br />XX. Concurrent Surface and Underground Mining -Rule 4.22 <br />No concurrent surface and underground mining is planned for the Permit renewal period. <br />XXI. Auger Mining -Rule 4.23 <br />No auger mining is currently proposed in the mine plan. However, auger mining was done in 1993 in <br />the Section 11 Pit. Further, highwall mining in the East Pit and West Pit has been approved. (PAP, <br />pages 2.05-38a and 4.23-1). No highwall mining has been approved for the South Taylor Pit. The <br />Division has placed a stipulation on the permit regarding highwall mining in the South Taylor Pit. <br />Based on the review of Permit Revision 02, the Division is adding the following one new stipulation <br />to the Colowyo permit regarding highwall mining: <br />STIPULATION 9 <br />PRIOR TO CONDUCTING ANY HIGHWALL MINING IN THE SOUTH TAYLOR PIT THE <br />COLOWYO COAL COMPANY SHALL SUBMIT A TECHNICAL REVISION TO THE <br />DIVISION INCLUDING A MINING PLAN AND SEQUENCE, A STABILITY ANALYSIS AND <br />A ZERO SUBSIDENCE ANALYSIS AND PLAN. HIGHWALL MINING MAY NOT BEGIN IN <br />THE SOUTH TAYLOR PIT UNTIL THE AFOREMENTIONED REVISION HAS BEEN <br />APPROVED BY THE DIVISION. <br />XXII. Operations on Alluvial Valley Floors -Rule 4.24 <br />The Permit was found to be in compliance with Rule 4.24. <br />Information on alluvial valley floors is found in Sections 2.04.7, 2.06.8 and 4.24; Exhibit 7; and <br />Maps 7, 11, 12, 12A, 32 and 37 of the Permit. Additional information pertinent to alluvial valley <br />floor investigations conducted in association with Permit Revision No. 2 is presented in Section <br />2.06.8 of Volume 12, as well as Maps 11A and 17 of Volume 14. A detailed summary of alluvial <br />valley floors identified during the original permitting of the Colowyo mine can be found in the <br />original findings document. <br />A. Designation of Alluvial Valley Floors <br />Stream Valley Segments Determined to be Alluvial Valley Floors <br />Proposed Decision and Findings of Compliance 4 May 2007 <br />Permit Revision 02 Page 61 <br />