Scientific Investigations Report 2005–5265
Frohner Meadows lies in a low-topographic-gradient glaciated terrane near the headwaters of Lump Gulch, about 15 miles west of the town of Clancy, Mont., in the Helena National Forest. During the last 120 years, ore was extracted at two sites (the Frohner mine and the Nellie Grant mine) upstream from Frohner Meadows. Lead-zinc-silver veins in granitic rocks of the Boulder batholith were mined, and the ore was treated nearby. As a result, accumulations of mine waste and mill tailings were distributed downslope and downstream by anthropogenic and by natural processes.
This report presents the results of an investigation of the geochemistry of the wetlands, streams, and unconsolidated sediment deposits and of the hydrology, hydrogeology, and water quality of the area affected by these sources of ore-related metals. Ground-water samples from mostly shallow wells in the meadows contained...>>MORE
Supersedes OF 2004-1254
Posted March 2006
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