Nah, mining is not bad for watersheds (full sarcasm)-
I just found out about this today. Treasure Canyon is a great run but apparently very polluted. Here is a quote and then a link from the Superfund report
"Ecological impacts from site contaminants are considerable, as the Alamosa River system below Summitville cannot currently support aquatic life. Studies have found potential adverse effects to agriculture and livestock from regular use of Alamosa River water."
"The chemicals of concern are heavy metals (copper, cadmium, manganese, zinc, lead, nickel, aluminum, iron) on-site and in the acid mine drainage."
Summitville Mine Superfund Site