Highest discharge Bonita Peak Mining District: 15,264,000 Zero containment highest discharge Ore Knob Mine 1,244,160 Ore Knob Mine Ashe County, N.C. Wash. County Lead Old Mines, Mo. Tar Creek Ottawa County, Okla. Ormet Corp. Hannibal, Ohio Barite Hill/Goldfields McCormick, S.C. Nelson Tunnel/Commodore Creede, Colo. Lava Cap Nevada City, Calif. Carpenter Snow Creek Neihart, Mont. Barker Hughesville Monarch, Mont. Pike Hill Copper Corinth, Vt. Sulpher Bank Mercury Clearlake Oaks, Calif. Upper Tenmile Creek Helena, Mont. Ely Copper Vershire, Vt. Wurtsboro Lead Mine Mamakating, N.Y. New Idria Mercury Mine Idria, Calif. Iron King/Humboldt Dewey-Humboldt, Ariz. Klau/Buena Vista Paso Robles, Calif. Basin Mining Area Basin, Mont. Captain Jack Mill* Ward, Colo. Standard Mine Gunnison Natl. Forest, Colo. Formosa Mine Riddle, Ore. Argonaut Mine Jackson, Calif. Madison County Mines Fredericktown, Mo. Blue Ledge Mine Rogue River-Siskiyou, Calif. 259,200 388,800 371,520 180,000 154,656 144,000 67,680 54,000 57,600 36,000 28,944 28,800 14,400 28,800 11,520 7,200 6,336 4,320 GALLONS PER DAY DISCHARGE Mine sites with zero containment, active treatment or storage of contaminated water 288-10,000 gallons 10,000-100,000 100,000-200,000 200,000-400,000 More than 400,000 0% 100% 90% 40% PERCENTAGE OF POLLUTED WATER DISCHARGE TREATED OR CONTAINED AVERAGE DAILY DISCHARGE VOLUME N.C. N.Y. OR S.C. TN MO OK VA VA S.D. OH CO CA MT VT AZ N.M. ID IN WA ME 1.06 million 1 million 1 million 455,040 134,640 *Had a temporary treatment system installed Dec. 2018. * 1.24 million