“Paredones Amarillos” is a proposed gold mine that would be located in the Sierra la Laguna Biosphere…If mining proceeds in this biosphere reserve…could become home to a toxic waste site...To extract gold…Vista Gold proposes, [a] process [that]…produces massive amounts of toxic waste...This type of open-pit gold mining can cause…toxic heavy metals to dissolve and drain into the watershed. The risk of acid mine drainage occurring in Sierra la Laguna is significant and the human and environmental cost would be tremendous: thousands of people and countless wildlife in the Sierra la Laguna desert rely on this water for survival.