Geophysical Investigation of the
Sulphur Bank Mercury Mine Superfund Site, Lake County,
California |
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Authors: | R W Hammack J I Sams G A Veloski J S Mabie |
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Affiliation: | (1) National Energy Technology Laboratory, U. S. Dept of Energy, Pittsburgh, PA, USA |
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Abstract: | Abstract. Airborne geophysical reconnaissance was used to identify
potential flow paths for mercury-rich, acidic water entering
Clear Lake near the Sulphur Bank Mercury Mine. Airborne magnetic
and electromagnetic conductivity surveys were conducted over a
12.3 km2 (4.75
mi2) area that included the Oaks Arm
of Clear Lake and the old mine. These surveys identified four
magnetic and/or conductive anomalies that may represent
groundwater conduits towards or away from the Herman
Impoundment. An anomaly that extended from Herman Impoundment
through a waste rock dam and into Clear Lake was selected for a
more detailed ground electromagnetic conductivity survey. The
combined results of the airborne and ground surveys provided a
detailed, lateral depiction of conductive zones, the most
probable pathways for groundwater flow. These surveys also
identified near-surface areas that may contain elevated
concentrations of sulfide minerals that weather to produce acid
groundwater. |
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Keywords: | :" target="_blank">: electromagnetic surveys magnetic surveys Sulphur Bank Mercury Mine Superfund |
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