Wiktionary
cyanide process
n. 1 A method of extracting gold and silver from their ores with a solution of sodium cyanide 2 A process of case-hardening iron or steel by immersing it in molten cyanide and then quenching in water or oil
WordNet
cyanide process
n. an idustrial process for extracting gold and silver by treating ore with a sodium cyanide solution
Usage examples of "cyanide process".
The cyanide process of extraction ensured that the earth of the dumps was barren and sterile.