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Accession Number:
ADA235416
Title:
Geophysical Surveys for Location of a Suspected Abandoned Mine Opening: Grays Landing Site
Descriptive Note:
Final rept.
Corporate Author:
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS GEOTECHNICAL LAB
Report Date:
1991-03-01
Pagination or Media Count:
37.0
Abstract:
Results of magnetic and electromagnetic surveys at the Grays landing Lock and Dam site on the Monongahela River near Waynesburg, Pennsylvania, are presented. the purpose of the surveys was to locate suspected abandoned mine openings in an area of the left abutment. Extensive subsurface mining of the Pittsburgh Coal has been carried out in this area since the mid-to-late nineteenth century. Old mine maps and records indicate an 1882 drift opening into the Alicia No. 2 Mine in the right abutment area which could be under water during a 100-year flood event. Exploratory drilling in the left abutment has failed to encounter the opening. The area surveyed is rugged topographically and contains considerable surface metallic debris which represents possible noise sources for the geophysical surveys. While the geophysical survey results are complicated, there are anomalies on both the magnetic and electromagnetic data profiles which are identifiable from one survey line to the next. An integrated geophysical anomaly map is presented. Three anomalous zones are identified which trend into a steep slope. One of these anomalous zones is consistent with the suspected location of the 1882 opening. Another anomalous zone may be associated with a concrete-lined drainage channel which is exposed on the riverward side of the slope and disappears into the slope this anomaly trends toward a more recent, known, sealed mine opening.
Distribution Statement:
APPROVED FOR PUBLIC RELEASE
