coal pit

a pit where coal is dug.

a place where charcoal is made.

Origin of coal pit

before 1050; Middle English colpytte, Old English collpytt

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

At Coal-pit Heath, seven miles from Bristol, his congregation numbered above two thousand.
The Life of the Rev. George Whitefield, Volume I (of 2)|Luke Tyerman
What useful little fellow is this, carrying his father's dinner to him at the coal-pit?
'Puffing Billy' and the Prize 'Rocket'|Helen Cross Knight
At St. Helen's one of the chain-men was laid hold of by a mob of colliers, and threatened to be hurled down a coal-pit.
The Life of George Stephenson and of his Son Robert Stephenson|Samuel Smiles
We record this month a signal act of heroism which took place a few years ago in a coal-pit near Dalkeith.
The Quiver, 2/1900|Various

"There is always risk, of a sort, down a coal-pit," replied her husband pontifically.
A Safety Match|Ian Hay