Electromagnetic Induction, Gamma and Fluid Logs from Shallow Boreholes at the Callahan Mine Site: May 2017

From October 2016 to July 2018, the U.S. Geological Survey, in cooperation with the U.S. Army Corps of Engineers and Maine Department of Transportation, collected surface, marine and borehole geophysical surveys to characterize the subsurface materials on land and under the water at a former mine facility in Brooksville, Maine. Borehole geophysical logs were collected from May 2-3, 2017 in five boreholes to identify geophysical properties, including the electrical properties and natural gamma emissions. In addition, fluid electrical conductivity and temperature were collected through the water column in the well. Results can be used to identify the water level and the lithologic contacts in the subsurface. Natural gamma, fluid electrical [...]