Laserfiche WebLink
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. <br />Your Reference: <br />Submitted by: <br />Sample Name: <br />•AGE _ <br />GX-24789-PRI <br />Date Received: <br />10/30/98 <br />Mountain Coal Company/West Elk Mine <br />Mr. Erik C. Petersen <br />Mayo & Associates <br />710 East 100 North <br />Lindon, Utah 84042 <br />West EIk Mine: SoW-1 <br />Date Reported: <br />11/21/98 <br />13,830 ± 970 ~ <C years BP (~ 3C corrected). <br />(17.87 t 2.15) 9'0 of the modarn (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 = - 9.9 %o <br />Notes: This date is based upon the Libby half 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 /> <br />SPECIALISTS IN GEOCHRONOLOGY & ISOTOPE GEOLOGY <br />