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IIIIIIIIIIIIIIII1II STATE OF COLORADO DIVISION OF MINERALS AND GEOLOGY Dcparlmem of Natural Resuwces 1 31 .I Sherman 51 . Kuom ? I S Denver, Colorado (41120'4 I'honc 13031 R66 1R.: FA\:131131 f1 P_-H 1116 November 30, 1995 I~~~~ DEPARTMENT OF NATURAL RESOURCES u~rv Numcr r nn•~oi„ Mr Michael R. Neumann nn~~.,c ~n,nn~•arl TerraMatrix ~,;,I,,,~,,,, ~~„~ P.O. Box 774018 u.,.~.,~~o~n•~~„~ Steamboat Sprinqs, Co. 80477 Re: 1994 Annual Reclamation Report and Annual Hydrology Report, Hayden Gulch Mine, Permit No. C-80-003, Hayden Gulch Terminal Dear Mr. Neumann: The Division has reviewed the 1994 Annual Reclamation Report and Annual Hydrology Report for the Hayden Gulch Mine and has the following questions or comments: ANNUAL RECLAMATION REPORT 1. Rule 2.04.13 requires the submittal of an annual reclamation report that,~addresses specific topics for discussion. The 1994 ARR does not appear to specifically provide discussion of those topics. Please provide data that addresses Rules 2.04.13(1)(a) through 2.04.•13(1)(f). SECTION 2.0- HYDROLOGIC MONITORING 2. There are references made to well UC-2, on page 2 and in Exhibit, 4 of the 1994 ARR. However, Map 1 in Exhibit 8 shows the well as being UC-1. Please reconcile this difference. 3. Examination of the surface water data for UHG-1 and LHG-1 suggests that the effect of mining may have been to increase the sulfate and TDS concentrations substantially. On average, the sulfate concentration increased from about 233 mq/1 to 818 mg/1 for the years 1987 through 1994. For those same years, the TDS increased, on average, from 708 mg/1 to 1775 mg/1. Although the water at UHG-1 already exceeds the suspect level for domestic drinking water use, due to the high TDS, and is marginal for sulfate, the apparent effect of mining may have been to increase the difficulty for a homeowner, who uses an