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III IIIIIIIIIIIIIIII 999 STATE OF COLORADO DIVISION OF MINERALS AND GEOLOGY Department of Natural Resources 1717 Sherman St., Room 215 Denver. Colorado 80203 DIVISION OF Phone: (10 71 866-7 56 7 M[ N E RA L S FAX: (707) 832-8106 & GEOLOGY RECLAMATION MINING•gAFETY December 10, 1999 Bill Owens Ga~ernor ' Kathleen Welt Greg E. Walther Executive Director Envirotunental Supervisor F.tichael B. Long Oxbow Mining Inc. oi~is~on Director P.O. Box 535 Somerset, Colorado 81434 Re: 1998 Annual Hydrology Report, Sanbom Creek Mine, Permit No. C-81-022, Oxbow Mining Inc. Deaz Ms. Welt: The Division has reviewed the 1998 Annual Hydrology Report (AHR) for the Sanbom Creek Mine. The Division commends the operator for doing a good job in collecting and reporting the required water monitoring data in accordance with the approved plan. Only minor deviations from the approved water monitoring plan aze noted for the frequency of data collection. Mine inflow was mapped and reported for 1998. It.appeazs that inflow has decreased in the "B" and "C" Seams from a total of 201 gallons per minute (GPM) in 1997 to 160 GPM in 1998. No-new inflow locations were reported. The following aze specific comments on the 1998 AHR: 1. The Table of Contents on page vi lists all of the monitoring data as 1997, this should be changed to monitoring data for 1998. 2. On page 152, the report "Aquatic Impairment Study of the Sanbom Creek Mine Dischazge, Somerset, Colorado" is stated to be included in Section 6. This report was. not included in the AHR. If appropriate, please update the AHR to include a copy of this report. 3. There appeazs to be a significant increase in total dissolved solids (TDS) and conductivity at surface water monitoring location S-2, immediately upstream of the North Fork of the Gunnison River. Is this appazent increase the result of mine water dischazge to Sanbom Creek? Please provide a brief explanation of impacts, if any, to the North Fork as a result of this dischazge.