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iii iiiiiiiiiiiuiii <br />STATE C.~~ LULURADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Dcparlmenl ul N,tl urn Ke suurce5 <br />I l l l Sherman 51., Ruum 215 <br /> <br />Drover, Colorado RU203 <br />Y <br />~lij~ <br />Phunr: (31131 Rbfi-75h7 II <br />FA%. 131331 ti L~HIp6 <br /> DEPARTMENT OF <br /> NATURAL <br />DATE: March 30, 1998 RESOURCES <br />TO: Dave Berry aw Romer <br />FROM: Harry Posey cGe'°°` <br /> <br />RE: tames 5 Lnchhead <br />West Elk Geochemical Assessment: Observations and Interpretations E.ecu~ioe D rector <br /> Michael B. Lurg <br /> Division Direcmr <br />This report provides a simple model to explain the data surrounding the West Elk situation. <br />Unequivocally, Dr. Mayo's interpretation is not the only plausible explanation of the data, nor is <br />it the simplest. The current report's interpretations, if regarded, deserve at least some mass- <br />balance calculations as a check on their adequacy, but overall the report provides a reasonable <br />hypothesis which seems consistent with all the information. <br />To accept or dismiss Dr. Mayo's interpretations outright would require further sampling along <br />with clarification of some of the data we have already. Frankly, I do not think this is necessary. <br />Despite some of the shortcomings, West Elk and Dr. Mayo have developed an incredible data <br />set, and we have enough information already to make awell-supported interpretation. Although <br />I did not set out to do so, the alternative model supports the Division's interpretations that the <br />fault and sump waters are the source of the Edwazds Portal seep water. This interpretation seems <br />to incorporate more of the data, has multiple avenues of support, and is compatible with the <br />probable hydrologic consequences predictions. It is simpler because it requires only mixing of <br />the fault waters with meteoric water to explain the vaziations in chemical compositions between <br />the fault and seep waters. <br />This is a summary document only. If you wish, I can develop a background presentation on <br />isotope geochemistry and the mixing model that will help explain it further, but the report should <br />be readable to Dr. Mayo and others in its present form. If you would like to discuss any of the <br />work with me, or if you have edits, please let me know. I would look forward to a discussion of <br />the isotope data with the group, if you think that would help. <br />cc: Mike Boulay Jim Burnell <br />Susan McCannon Jim Pendleton <br />m:\m in\hhp\westelk2.doc <br />