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Water quality and discharge data from draining mine tunnels near Silverton, Colorado 1988-2015 The American Tunnel, the Black Hawk mine, the Gold King mine, the Mogul mine, and the Red and Bonita mine are located in the Cement Creek watershed, tributary to the upper Animas River near Silverton, Colorado. All five sites have tunnels that drain groundwater from abandoned underground mine workings to the surface. This draining water has elevated concentrations of metals and degrades water quality in Cement Creek. Water quality (pH, and dissolved copper, manganese, and zinc concentrations) and discharge data were compiled from multiple sources to examine changes in these parameters through time. Copper, manganese, and zinc loads calculated from these data are included in the data files. Data are reported for... Categories: Data; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Colorado, Environmental Health, Geochemistry, Gladstone, San Juan, All tags... Silverton, USGS Science Data Catalog (SDC), Water Quality, Water Resources, abandoned mines and quarries, chemical analysis, environment, mine drainage, remediation, Fewer tags