shale pit

English

Noun

shale pit (plural shale pits)

1. A quarry or mine where shale rock is mined.
   • 1958 September, Anthony A. Vickers, “The Winchburgh Shale Line”, in Railway Magazine, page 612:

     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.