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Treatment of fluvially deposited streamside mine waste: material from Canyon Creek, Idaho.

Paulson AJ; Balderrama R; Zahl E
Spokane, WA: U.S. Department of the Interior, Bureau of Mines, RI 9633, 1996 Jan; :1-58
The effectiveness of size fractionation treatment on fluvially deposited streamside mine waste was examined with material from Canyon Creek, Idaho. Grab samples collected from the upper and lower areas of 80 pits were inspected for three types of mine waste contaminated materials. The size distribution of the metals in these samples was determined. The cutoff sizes for the alluvium, reworked tailings, and flood plain tailings samples were 2, 19.5, and 2 millimeters, respectively. Pit samples which contained a wide range of similarly patterned metals were chosen for composite samples. Damp and wet screening and column leaching tests were applied to the alluvium, reworked tailings, and flood plain tailings composites. Solutions were analyzed by inductively coupled plasma emission spectrometry. In the alluvium composite, both static and column leaching tests released more metals from the damp screened fraction than from the wet screened fraction. The weighted average concentrations of damp screened, segregated metals were slightly lower than those of the alluvium composite. For alluvium, reworked tailings, and flood plains tailings, markedly lower metal concentrations were released during the column leaching test than during the static test. In the reworked tailings composite, the metals were concentrated in the finer, mine waste fraction. Higher metal concentrations were found in the flood plains tailings composite than in either the alluvium or reworked tailings composites. Metal releases from the wet screened fraction were much lower than metal releases from either the composite or the damp screened fraction. The damp and wet screened gravel sand fractions were further separated. Higher metal concentrations were observed in the damp screened subfractions than in the wet screened subfractions. The authors conclude that size fractionation does not maximize the benefits of separating fluvially deposited tailings.
Metal-compounds; Metallic-minerals; Heavy-metals; Analytical-methods; Sampling-methods; Laboratory-techniques; Environmental-contamination; Analytical-processes; Spectrographic-analysis; Mining-industry; Environmental-factors
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Spokane, WA: U.S. Department of the Interior, Bureau of Mines, RI 9633
Page last reviewed: September 2, 2020
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