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

Metadata Updated: October 29, 2023

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 in five boreholes from May 2-3, 2017 to identify geophysical properties, including the electrical properties and natural gamma emissions, which can be related to geologic materials behind casing. 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 conductivity, temperature and electromagnetic induction logs are provided in a series of files within a compressed (zip) file. Equipment used, measurement units and calibration information are described in the log files.

Access & Use Information

Public: This dataset is intended for public access and use. License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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Metadata Created Date June 1, 2023
Metadata Updated Date October 29, 2023

Metadata Source

Harvested from DOI EDI

Additional Metadata

Resource Type Dataset
Metadata Created Date June 1, 2023
Metadata Updated Date October 29, 2023
Publisher U.S. Geological Survey
Identifier USGS:5cc3d7dde4b09b8c0b7609bd
Data Last Modified 20200825
Category geospatial
Public Access Level public
Bureau Code 010:12
Metadata Context
Metadata Catalog ID
Schema Version
Catalog Describedby
Harvest Object Id 512d8bf3-8cd8-4413-bf13-b689da07502d
Harvest Source Id 52bfcc16-6e15-478f-809a-b1bc76f1aeda
Harvest Source Title DOI EDI
Metadata Type geospatial
Old Spatial -68.82514,44.32901,-68.79519,44.35651
Publisher Hierarchy White House > U.S. Department of the Interior > U.S. Geological Survey
Source Datajson Identifier True
Source Hash b72afd9b95cd84de3b93584979a8eb44ba9fc7016d196f7258c23438ca234766
Source Schema Version 1.1
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