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D3411 - 5227 <br />UNITED STATES DEPARTMENT OF LABOR <br />MINE SAFETY AND HEALTH ADMINISTRATION <br />• TECHNICAL SUPPORT <br />MSHA BLASTING APPROVAL <br />TRINIDAD BASIN STRIP MINE <br />Trinidad Basin Mining Company <br />• Trinidad, Colorado <br />January 6, 1981 <br />by <br />Richard L. Fischer <br />Physical Scientist <br />• <br />Issuing Office <br />Industrial and Electrical Safety Division <br />Ibnald Hutchinson, Chief <br />• SAFETY AND HEALTH TECHNOLOGY CENTER <br />A. Z. Dimitroff, Chief <br />P.O. Box 25367, Denver Federal Center <br />Denver, Colorado 80225 <br />