a. The driving of advance exploring headings and up-and-down boring to establish the continuity and thickness of coal seams or other mineral deposits. See also: exploratory drilling
b. Extensions of a known ore deposit may be probed along its strike or dip in which shafts, drifts, or crosscuts may be driven. A study of the habits of known ore shoots, by mapping, surveying, and sampling, is a desirable preliminary to underground exploration. Nelson
Source:
Dictionary of Mining, Mineral, and Related Terms












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