The gold cyanide complex adsorb onto the carbon and is proposed to be reduced back to the metal.
[3] Leached pulp and carbon are transferred in a countercurrent flow arrangement involving a series of tanks, usually numbering 4 to 6.
In the final tank, fresh or barren carbon is put in contact with low grade or tailings solution.
The final loaded carbon is removed from the machinery and extracted with a hot alkaline solution of cyanide.
The cathodes (wire wool, now plated with gold and other metals) are removed and placed in sulfuric, hydrochloric, or nitric acid.