Acid Mine Drainage Biofilms and Water Verespatak and Horrorriver-2
Acid mine drainage in Verespatak central mine, and Horrorzone mine rivers (Transylvania) have surprisingly rich microbial ecosystems, incl. biofilms. Their pH is around 2.5 and have excess sulfate and dissolved metals like Al, As, Cd, Co, Cu, Fe,  Ni, Pb, Se, Zn.