Carbon in Pulp (CIP) Vs Carbon in Leach (CIL) Vs Carbon in Column (CIC)Carbon in Pulp (CIP): It is the sequential leach then absorption of gold from ore. During CIP stage, pulp flows through several agitated tanks where sodium cyanide and oxygen have been added to dissolve gold into solution, In the absorption stage, this solution flows through several agitated tanks containing activated carbon.