Adit

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  1. A horizontal or nearly horizontal passage driven from the surface for the working or dewatering of a mine. If driven through the hill or mountain to the surface on the opposite side, it would be a tunnel. Syn: drift; adit level. See also: tunnel
  2. As used in the Colorado statutes, it may apply to a cut either open or undercover, or open in part and undercover in part, dependent on the nature of the ground.
  3. A passage driven into a mine from the side of a hill. Statistical Research Bureau
    Source: Dictionary of Mining, Mineral, and Related Terms


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