Ore hearth

a low furnace in which rich lead ore is reduced; - also called Scotch hearth.
- Raymond.

See also: Ore

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
An 1847 document lists five roasting furnaces, ore bunkers, eight ore hearths, a refining furnace, two reducing furnaces, two calcining furnaces, two reverberatory furnaces, a slag hearth and a separating house with 18 pots.
The smelt mill was in production for 160 years and grew to have six ore hearths, a slag hearth, four furnaces and a de-silvering house.