Effect of Apatite II Barrier on Metal Loading to Nine Mile Creek from the Success Mine Tailings Pile (USGS and the Idaho Department of Environmental Quality). Flow rates vary seasonally from 1 gpm to 50 gpm.

Metal Loading* Metal Loading

Prior to Barrier Emplacement After Barrier Emplacement

(lbs of metal per year) (lbs of metal per year)

Cd Pb Zn Cd Pb Zn

730 1,830 19,260 0.036 0.51 4.50

*based upon daily loadings measured in 1994 and 1995.

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