1990-03-27_REPORT - C1981013 (5)

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represents less than one percent of the calculated runoff for each system. However, in those canyons which have surface entries into the coal (Ciruela and Apache) , seepage from shafts may add to the alluvial water loss. The mine inflow studies (Appendix 3) indicate that 27 . 5 gpm entering the Golden Eagle Mine comes from shafts located in Ciruela Canyon and 8 gpm entering the New Elk Mine comes from shafts located in Apache Canyon. These flows are significant when compared to the calculated runoff available for these two canyons; suggesting a localized impact on surface and alluvial flow of water at the mouth of each canyon. In terms of water quality of the Purgatoire River and associated alluvium, mine discharges and leachate from refuse contribute to higher ionization of the water and increased amounts of trace elements. The main parameters of interest are sodium and other dissolved salts which may effect downstream use of the water for irrigation. Obviously, these increases will have a greater impact as flows in the river are low. However, even at low flow conditions, effects of ionization caused by mining are insignificant when compared to the natural deterioration of water quality as the river flows to the east (see Introduction Discussion) . Also, installation of improved surface facilities will control water quality discharges from mining operations. Water quality in side canyons of the river should not be effected by mining operations because of limited surface disturbance contribut- ing to water quality deterioration. Assessments of springs and seeps (Appendix 4) and area water users (Appendix 5) indicate that mining at the New Elk and Golden Eagle Mines should not effect current uses of surface and ground waters. -20-