Brine pit

a salt spring or well, from which water is taken to be boiled or evaporated for making salt.

See also: Brine

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
* Brine Pit Pipes: After more than a decade, inspection revealed no corrosion (even on bolt threads) on pipes treated with CleanWirx.
Originally salt was extracted from the ground by a series of natural brine pits.
Yet although "vast sums of money" was spent on sinking brine pits and erecting a salt works, the business, on the banks of the Worcester and Birmingham Canal, had proved to be a poisoned chalice.
But in the park there is a stone statue of St Richard of Chichester, who was born in Droitwich and according to legend blessed one of the brine pits when it ran dry.