Evaluation of Copper Mine Tailings Using EPA Leaching Technology.
Vol II 5th Billings Symp on Dist Land Rehab Mt St Univ Recl Res Up 9003 3/25-30/90 Pp 5-12 II:5-12
The U.S. Bureau of Mines investigated three different Environmental Protection Agency (EPA) leaching procedures used to evaluate metal contamination in mill tailings. These procedures were the toxic characteristic leaching procedure (tclp), the extraction procedure toxic test (ep tox), and method 1312 (m-1312). Tclp and ep tox use acetic acid; m-1312 uses a 60-40 mixture of sulfuric and nitric acids. Samples from mill tailings from 12 mines located in 5 different Western States were used in the tests. The data from each mine were compared qualitatively by region and leaching procedure, and then the complete data set was compared statistically by leaching procedure. The results indicated that the three leaching procedures sometimes produced results that differed from each other. If differences were detected, the tclp usually produced higher concentrations of metals in the leachate than the other two methods.
Vol II 5th Billings Symp on Dist Land Rehab, Mt St Univ Recl Res Up 9003, 3/25-30/90, Pp 5-12