shale pit

noun

noun

A quarry or mine where shale rock is mined.

While shale pits and their ancillary undertakings are being run down, and some finally closed, the Winchburgh oil factory is still in operation, with its own surface rail system bringing in shale from neighbouring pits.1958 September 23, Anthony A. Vickers, “The Winchburgh Shale Line”, in Railway Magazine, page 612:

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