adjective Mining.
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.

1910–15 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
One would think that open-pit coal mining would destroy fossils.
The fossil snake bones were found in an open-pit coal mine, along with its
  prey, which included turtles and crocodiles.
To get at the bitumen, the companies bulldoze wetlands to create vast open-pit
Where abundant capital is available, the preferred method is open-pit mining.
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