Mining and drilling control of distance to the coal-shale interf

Details Mining and drilling control of distance to the coal-shale interf Mining and drilling control of distance to the coal-shale interf

1977-03-31

1978-09-19

Smith, Alfred E.

Radiant energy

Geological testing or irradiation

175 41, G01V 500, E21B 4700

Patent

active

041156889

ABSTRACT:
A method for determining the distance from a given point in a coal seam to shale by sensing the thorium radiation from shale layers positioned about the coal seam. The invention is useful for maintaining a drill in a desired position in a coal seam and guiding the drill in response to the sensed radiation.

REFERENCES:
patent: 3940610 (1976-02-01), Dennis et al.

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