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Meaning of open-pit

o•pen-pit

Pronunciation: (ō'pun-pit"), [key]
— adj. Mining.
  1. noting or pertaining to a type of surface mining in which massive, usually metallic mineral deposits are removed by cutting benches in the walls of a broad, deep funnel-shaped excavation.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.