U.S. EPA Contaminated Site Cleanup Information (CLU-IN)

U.S. Environmental Protection Agency
U.S. EPA Technology Innovation and Field Services Division

Search Result

Gerson, A.R., P.J. Rolley, C. Davis, S.T. Feig, S. Doyle, and R.S.C. Smart.
Nature: Scientific Reports 9:Article 4357(2019)

This paper demonstrates that standardized acid-base accounting (ABA) tests may not always provide the correct acid mine drainage (AMD) classification for commonly occurring waste rocks containing low-pyrite and -carbonate due to mineralogic assumptions inherent in their design. The application of these standard ABA tests at a copper mine site in South Australia resulted in the classification of a portion of its waste material as potentially acid forming in apparent contradiction to long-term field measurements. Full definition of the sulfide and silicate minerals enabled re-evaluation of the weathering reactions. The overall rate of neutralization due to silicate dissolution was found to always exceed the rate of acid generation, in agreement with field observations. Consequently, the waste rock was redefined as non-acid forming. This article is Open Access at https://www.nature.com/articles/s41598-019-40357-4.

The Technology Innovation News Survey welcomes your comments and suggestions, as well as information about errors for correction. Please contact Michael Adam of the U.S. EPA Office of Superfund Remediation and Technology Innovation at adam.michael@epa.gov or (703) 603-9915 with any comments, suggestions, or corrections.

Mention of non-EPA documents, presentations, or papers does not constitute a U.S. EPA endorsement of their contents, only an acknowledgment that they exist and may be relevant to the Technology Innovation News Survey audience.