The figure shows coal mines (marked with an "x") and mineral minds (black dots) in the three study ecoregions.
Characteristics of the Northern Appalachian (NAP), Southern Appalachian (SAP) and Temperate Plains (TPL) ecoregions. 892 Ecoregion area is from US EPA's National Wadeable Streams Assessment (US EPA, 2006), and total stream length within each 893 ecoregion was determined from the NHDPlusV1 stream layer. Total number of mineral mines is from USGS Mineral Resources 894 Program (USGS, 2003), and total number of coal mines (minor and major) is from USTRAT database (USGS, 2012). Highest mine 895 density was calculated for network catchments. Average percentages of agricultural and urban land use and impervious surface within 896 each region were derived from the 2001 NLCD.