a.1.Yielding free gold or silver; - said of certain ores which can be reduced by crushing and amalgamation, without roasting or other chemical treatment.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
The majority of resource at Akoko North comprises shallow, free-milling oxide ore with high metallurgical recoveries, Goldcrest said.