ABSTRACT
The results showed elevated levels of antimony (>100 μg/L) and arsenic (>600 μg/L) in excess of the USEPA drinking water standard (EPA 2009), adjacent to eroded tailings piles. Highest metal concentrations were measured downstream of springs draining the base of the tailings on the western bank of the creek, which show characteristics of Acid Rock Drainage (ARD). Arsenic levels were rapidly diluted downstream from the tailings to background levels before its confluence with the Kuskokwim River.
