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GEOCHRON LABORATORIES <br />a division of Krueger Enterprises, Inc. <br />711 CONCORD AVENUE • CAMBRIDGE, MASSACHUSETTS 02138-1002 • U . S . A <br />TELEPHONE: (617)876-3691 TELEFAX: (617)661.0148 E-MAIL: staff~geochronlabs.com <br />RADIOCARBON AGE DETERMINATION REPORT OF ANALYTICAL WORK <br />Our Sample No. GX-24794-PRI Date Received: 10/30/98 <br />Your Reference: Mountain Coal Company/West Elk Mine Date Reported: 1 1 /21 /98 <br />Submitted by: Mr. Erik C. Petersen <br />Mayo & Associates <br />710 East 100 North <br />Lindon, Utah 84042 <br />Sample Name: West Elk Mine: G-25 <br />•AGE = 3,530 t 420 14C years BP (1~C corrected). <br />(64.43 ± 3.33) % of the modern (1950) 14C activity. <br />Description: Sample of groundwater precipitate. <br />Pretreatment: The barium salt precipitate was rapidly vacuum filtered and immediately hydrolyzed, <br />under vacuum, to recover carbon dioxide from the barium carbonates for the analysis. <br />13C analysis was made on a small portion of the same evolved gas. <br />Comments: <br />S13CPD8 = -9.3 %. <br />Notes: This date is based upon the Libby halt life (5570 years) for 14C. The error stated is ± 1a as judged by <br />the analytical data alone. Our modern standard is 95% of the activity of N.B.S. Oxalic Acid. <br />The age is referenced to the year A.D. 1950. <br />CJ <br />SPECIALISTS IN GEOCHRONOLOGY 8 ISOTOPE GEOLOGY <br />