A precious metals leaching technique in which granular activated carbon
particles much larger than the ground ore particles are added to the
cyanidation pulp after the precious metals have been solubilized. The activated
carbon and pulp are agitated together to enable the solubilized precious metals
to become adsorbed onto the activated carbon. The loaded activated carbon is
mechanically screened to separate it from the barren ore pulp and processed to
remove the precious metals and prepare it for reuse.
Source: Dictionary of Mining, Mineral, and Related Terms