Lined waste storage pond at the Bunker Hill mining complex, which contains low pH acid mine drainage awaiting treatment.
United States Environmental Protection Agency
2011-06-14
<a rel="nofollow" class="external text" href="http://yosemite.epa.gov/r10/cleanup.nsf/8065e3cf3d5268538825778300663abc/c0379664d0efcd368825690000774cdc!OpenDocument">"Bunker Hill Photo Gallery"</a>