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<br /> <br /> <br />U. S. Department of Labor <br />Mite Satety and Health Administration <br />P.O. Box 25367 <br />Denver. Colorado 80225-0367 <br />Coal Mine Safety and Health <br />District 9 <br />~£a <br />E. Peter Matthies <br />President <br />New Castle Energy Corporation <br />7625 East Napa Place <br />Denver, CO 80237 <br />Dear Mr. Matthies: <br />RE: idine ID No. 05-03718 <br />Coal Ridge No. 1 Mine <br />30 CFR 75.400 <br />Underground Waste Rock Storage Plan <br />This is in response to your letters dated April 5 and May 21, 1990, <br />concerning the referenced underground waste rock storage plan at <br />the subject mine. Your inquiry to store incombustible materials, <br />such as tunnel rock, in underground areas of your mine, would be <br />allowed provided adequate safeguards are in place to protect the <br />health and safety of the mine personnel. <br />Your question concerning other mines in the country or world which <br />have permits to store waste materials underground can be answered <br />as follows: Several mines nationwide, both active and inactive <br />(abandoned) mines, have underground waste storage plans in <br />existence. <br />Mine waste storage plans are reviewed on a mine to mine basis <br />taking into account the mine's individual circumstances and what <br />safeguards are in place, before permission is granted to store mine <br />waste. <br />You are welcome to visit this office and discuss the mine waste <br />storage plan. If you have further questions, please contact this <br />office at 303/236-2743. <br />Sincerely, <br />Jerry K. Tay or <br />Acting District Manager <br />Exhibit 4.3-2 <br />