This gold cyanide leaching unit was designed and constructed in 2018 in collaboration with the Faramine Asia Industrial Mining Group in Mashhad. The processing plant has a capacity of 200 tons of dry solid material per day. The processing method involves cyanidation, gold absorption via Carbon in Pulp (CIP), elution, and finally gold electrowinning in specialized tanks. The electrolytic product is then acid-treated, melted, and cast into ingots, including precious metals like silver, platinum, and palladium, which are also separated and processed during the acid treatment.

Innovative techniques were applied in the design and construction of this unit to enhance production efficiency and reduce operational challenges. The elution unit was designed to perform gold complex re-dissolution under atmospheric pressure, making it the first and only elution unit in Iran capable of operating at atmospheric pressure, while maintaining high processing efficiency and effective gold electrowinning.

The plant’s design focuses on minimizing the number of pumps used to reduce energy consumption. Additionally, carbon transfer between tanks in the CIP process is done without pumps, avoiding damage to the carbon structure, which can produce fines. Centrifugal pumps at this stage could lead to product and active carbon loss due to the carbon’s fragility.

Moreover, the tank agitation process is designed to minimize damage to the carbon while ensuring optimal suspension of particles with minimal energy consumption.

Construction of this processing unit adhered to all relevant standards in tank fabrication, welding, civil engineering, power control panels, and piping. The Faramine Asia Industrial Mining Group continues to manage and operate this unit to date.