Laserfiche WebLink
XVIL Protection of Underground Mining - Rule 4.19 <br />Colowyo will conduct no coal mining closer than 500 feet to any point of either an active or <br />abandoned underground mine. Underground coal mines have been operated in the past, as <br />discussed in Section 2.04.4, but their locations were on the northern side of Streeter Draw, well <br />over 500 feet from present Colowyo mining. The surface mining activities of Colowyo have <br />been designed so as not to endanger any present or future operations of either surface or <br />underground mining operations [Rules 4.19(1) and 4.22.4(1)]. <br />XVIIL Subsidence Control - Rule 4.20 <br />The Permit was found to comply with Rule 4.20. <br />Colowyo is mainly a surface coal mining operation. A small area was auger mined (see XXI <br />below). Subsidence over the auger mining was not considered a significant concern. The <br />possibility of large scale pillar failure over an area sufficient to produce surface effects was <br />considered very low. (CTL /Thompson, Inc., Auger Mining Analysis, February 5, 1996). No <br />renewable resources or structures overlie the augered area. (PAP, page 4.23 -2) [Rules 2.05.6(6) <br />and 4.20]. There is no current requirement for monitoring of subsidence by Colowyo at the <br />Colowyo Mine. <br />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) within the permit <br />area is found to be in 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 />XXL Auger Mining - Rule 4.23 <br />No auger mining is currently proposed in the mine plan. However, auger mining was done in <br />1993 in the Section 11 Pit. Further, highwall mining in the East Pit and West Pit has been <br />approved. (PAP, pages 2.05 -38a and 4.23 -1). No highwall mining has been approved for the <br />South Taylor Pit. The Division had previously placed Stipulation No. 9 on the permit regarding <br />highwall mining in the South Taylor Pit. <br />XXIL Operations on Alluvial Valley Floors - Rule 4.24 <br />The Permit was found to comply with Rule 4.24. <br />Colowyo Coal Mine C1981 -019 PR -03 69 April 10, 2013 <br />