Cyanidation of mercuryrich tailings in artisanal and
#0183;#32;Cyanidation occurs in agitated tanks, followed by either the MerrillCrowe process (the precipitation of gold from cyanide solutions with zinc) or the CarboninPulp process (the adsorption of gold from cyanide with carbon) (Veiga et al., 2009). Download : Download fullsize image; Fig. 1. Location of PortoveloZaruma and Ponce Enriquez.