The cyanide process is used for the extraction of

2 2 4 2 Ag S+4NaCN 2Na Ag CN +Na SO → 70. Cyanide process is used for the extraction of (a) barium (b) silver (c) boron (d) zinc The process of extraction in which cyanide is used is known as the Mac Arthur Forest cyanide process. In this process, leaching is done of precious metals like gold and silver is done. The fine powder of silver or gold is treated with a dilute solution of sodium or potassium cyanide, as a result, silver or gold gets to combine with - CN forming a soluble complex.