Answer:
The answer is Leaching.
Step-by-step explanation:
The cyanidation of gold is a metallurgical technique for the extraction of gold from low quality ore, which seeks to convert gold (insoluble in water) into complex metal anions of aurocyanide (soluble in water) through a process called leaching, which is a process in which a liquid solvent passes through a pulverized solid so that the dissolution of one or more of the soluble components of the solid occurs.