society > occupation and work > industry > working with specific materials > working with metal > [noun] > extraction from ore > extraction of silver or gold (3)
(a) a method of extracting gold and silver from ores by treatment with a dilute solution of sodium or calcium cyanide (or, formerly, potassium…
The process of cyaniding gold or silver ores; the extraction of these metals from their ores by means of the cyanide process.