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SmUOrn CmY Mln~ iii iiiiiiiiiiiiiiii 999 April 27, 1999 ~{ECEIVED Mr. Larry Routten Colorado Division of Minerals and Geology MAY 10 1999 Office of Mined Land Reclamation 1313 Sherman Street, Room 215 Division of MineralS~OeologY Denver, CO 80203 Re: Emergency Mine Dewatering, Minor Revision No. 51, Permit No, C-81-022 Dear Mr. Routten: As you are aware from our discussions during your site inspection last week and from correspondence with the Water Quality Control Division (attached), measurements of a borehole recently completed into Oxbow Mining, Inc.'s ("Oxbow") Sanborn Creek Mine have indicated that the water level is rising in the mined longwall panel. With the longwall equipment being threatened by the rising water levels, Oxbow requests a minor revision to begin pumping from the mine through the original water infusion borehole and discharge it through a new pond located along the river in NW1/4, SW1/4 Section 11, T13S, R90W, Sixth P.M. Oxbow has contracted the services of Mayo & Associates ("Mayo") to complete isotopic and solute chemistry analyses, as well as the analysis of certain metals as suggested by the Water Quality Control Division ("WQCD"). Mayo completed sampling and field parameter measurements on Wednesday and Thursday last week. The results of these in-mine sample analyses will be reported to you and WOCD as they become available. The field parameters are provided in the table below. ~ Temp. (C°) EC (µs/cm) pH Well 8 (in-mine) 26.9 >2,000 7.9 N. Fork Gunnison 7.9 160 8.2 River SC-3 13.1 650 7.6 SC-4 13.3 >2,000 12.5 The pond was constructed west of the emergency river water pumping site in an area previously disturbed by the road constructed to the river pump station per Minor Revision 50 ("MR50"). The bottom of the pond is located at 6,120' in elevation and the bottom of P.O. Box 535 3737 Highway 133 Somerset. Colorado 01434 USA TEL (970) 929-5122 FAX (970) 929-5177