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Centennial Materials <br />INC. <br />September 23, 1997 <br />Division of Minerals and Geology <br />1313 Sherman St. Room 215 <br />Denver, Colorado 60203 <br />Re: M-83-060 Thornburg Pit <br />Dear Sir: <br /> <br />Attached herewith is the Thornburg Pit annual report. <br />Thank you for your assistance. <br />Sincerely, <br />Donald L. Opheim <br />Centennial Materials Inc. <br />1101 Topeka Way • Castle Rock, CO 80104 • (303) 688-1183 <br />AN EQUAL OPPO RTUNiTY EMPLOYER <br />