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III IIIIIIIIIIIIIIII <br />999 <br />STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Department of Natural Resources <br />1313 Sherman St., Room 215 <br />Denver, Colorado 80203 <br />Phone: 13031 866-3567 <br />FAX: (3031 832-8106 <br />DATE: December 5, 2994 <br />TO: Jim Pendleton <br />FROM: Erica Crosby ~ J~ <br />RE: Roadside Portal Mines (C-81-041) <br />Subsidence Issues <br />~~ <br />DEPARTMENT OF <br />NATURAL <br />RESOURCES <br />Roy Romer <br />Governor <br />lames 5. Lochhead <br />Executive Direcio~ <br />Michael 8. Long <br />Division Director <br />Jim, as I mentioned to you last week Powderhorn is now mining at <br />the Roadside North Portal Area (formerly known as the Cameo Mine). <br />Portions of the North Portal area are included in their 5-year mine <br />plan that was approved in January of 1993. After our discussion, <br />it appears that this area was never review for subsidence related <br />issues. <br />Attached, please find some old aerial photographs of that region, <br />a USGS topo map and the proposed mine plan map. Harry Ranney will <br />be flying over this area sometime this week. I will provide you <br />with the photos once they are developed. Since they are already <br />mining, I am requesting that you look over the potential subsidence <br />issues related to the North Portal Area as soon as possible. It <br />appears that they will be mining under Coal Creek and Jerry Creek <br />in 1995. <br />One final note, Powderhorn was stipulated in their permit to <br />conduct a semi-annual surface visual inspection encompassing the <br />areas to be undermined. These features must be documented and <br />photographed for historic record keeping purposes and submitted as <br />a report to the Division by December 31 of each year. This visual <br />inspection will be conducted at the North Portal Area in 1995. <br />Please let me know by January 13, 1994 if additional monitoring is <br />prudent, or if you have any concerns that need to be addressed by <br />Powderhorn. Thanks. <br />Enclosure (s) <br />c:\roadside\941205 <br />