Modify Selection
- Mine locations, excavations, and structures:
- Boreholes
- Document types:
- Contract reports
Home Links
Results 1 - 2 of 2
-
9/1/1981 - Contract reportsThe purpose of this project was to enhance the Bureau of Mine's Cableless Electronic Survey System use to aid in the drilling of long boreholes in coal as part of the methane drainage program. The system that was ultimately developed was field tested an...
-
9/1/1978 - Contract reportsThis report describes the feasibility test of an electromagnetic method for locating boreholes, with or without casing, that have been drilled in conjunction with mining operations but without precisely known locations with respect to the tunnel.
Home Links
Content source: National Institute for Occupational Safety and Health, Mining Program