USGS geologist breaks mineralized rocks for examination and sample collection
USGS geologist George Case breaks mineralized rocks for examination and sample collection at the Groundhog Basin Ag-Sn-Pb-Zn deposit. Summer field work at headwall of Nelson Glacier in Stikine River corridor on the Transboundary Waters Project. The purpose of this work is to understand the geochemistry, mineralization, and distribution of the rocks that contribute to the chemistry of streams in the Stikine River corridor.
Sue Karl, U.S. Geological Survey