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  1. The work of excavating as mining goes forward in an entry and in driving rooms; to extract all or part of an area; first mining as distinguished from retreat. BCI
  2. Rate at which a drill bit penetrates a rock formation. Long
  3. Feet drilled in any specific unit of time. Long
  4. The linear distance (in feet or meters) driven during a certain time in tunneling, drifting, or in raising or sinking a shaft. Fraenkel
    Source: Dictionary of Mining, Mineral, and Related Terms

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