Gold Recovery Process (CIP / CIL Carbon-in-Pulp & Carbon-in-Leach)

High-Efficiency Gold Recovery System for Modern Mining

Advanced CIP / CIL gold recovery technology designed to maximize gold extraction efficiency while reducing chemical consumption and environmental impact.

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What is CIP / CIL Gold Recovery?


CIP (Carbon-in-Pulp) and CIL (Carbon-in-Leach) are advanced gold extraction methods where activated carbon is used to adsorb dissolved gold from cyanide leach solution.

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CIP vs CIL gold recovery process flow diagram

Gold Recovery Process Flow (Step-by-Step)

Gold leaching tank process in CIP CIL gold recovery plant

Gold Leaching Process

Gold-bearing ore is mixed with leaching solution, allowing gold particles to dissolve and form a gold-rich pregnant solution.

Activated carbon adsorption tank in CIP CIL gold processing system

Activated Carbon Adsorption

Dissolved gold is adsorbed onto activated carbon, concentrating valuable metals for efficient downstream recovery.

Gold desorption and elution equipment in gold recovery plant

Gold Desorption Process

Gold is stripped from loaded carbon using high-temperature elution technology, producing a concentrated gold-bearing solution.

Electrowinning cell with gold deposition on cathodes

Electrowinning Gold Recovery

Gold ions are deposited onto cathodes through electrowinning, converting dissolved gold into solid metallic form.

Gold smelting and refining process producing final gold bars

Final Gold Refining

Recovered gold is smelted and refined into high-purity doré bars, ready for sale or further refining.

CIP vs CIL Process Comparison

Feature CIP CIL
Process Type In-Place Cleaning In-Line Cleaning
Application Fixed Equipment Portable Equipment
Efficiency High Medium

Frequently Asked Questions About CIP/CIL Gold Recovery

What is the difference between CIP and CIL?

CIP (Carbon-in-Pulp) and CIL (Carbon-in-Leach) are both gold recovery processes that use activated carbon to adsorb dissolved gold. In CIP, leaching and adsorption occur separately, while in CIL both processes take place simultaneously within the same tanks, resulting in improved recovery efficiency.

Which process is better, CIP or CIL?

CIL generally provides higher gold recovery rates because adsorption occurs during leaching. CIP may offer lower operating costs and is often selected based on ore characteristics and plant design requirements.

What is the gold recovery rate of CIP/CIL plants?

Modern CIP and CIL plants can achieve gold recovery rates of 90%–98%, depending on ore grade, mineral composition, carbon activity, and process optimization.

What chemicals are used in CIP/CIL gold recovery?

The most common chemicals include sodium cyanide, lime, activated carbon, flocculants, and various process reagents used to improve leaching efficiency and gold adsorption.

Can eco-friendly gold leaching reagents be used in CIP/CIL systems?

Yes. Many modern gold processing plants are evaluating non-cyanide and eco-friendly gold leaching reagents as alternatives to traditional cyanide systems to reduce environmental impact and improve safety.

What types of ores are suitable for CIP/CIL processing?

CIP and CIL systems are widely used for:

  • Oxide gold ores
  • Free-milling gold ores
  • Low-grade gold ores
  • Tailings reprocessing
  • Some refractory ores after pretreatment

How long does the CIP/CIL process take?

Depending on ore characteristics, retention time typically ranges from 12 to 48 hours for effective gold leaching and adsorption.

What is activated carbon used for in CIP/CIL?

Activated carbon acts as an adsorbent that captures dissolved gold from the leach solution, allowing efficient recovery before desorption and electrowinning.

What are the main advantages of CIP/CIL technology?

  • High gold recovery rates
  • Continuous operation
  • Suitable for large-scale mining
  • Lower operating costs
  • Proven industrial performance

Can CIP/CIL be used for gold tailings recovery?

Yes. Many mining operations use CIP and CIL technology to recover residual gold from tailings, increasing resource utilization and improving project profitability.

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Industrial CIP CIL gold recovery plant with modern mining equipment