ndonesia is rich in mineral resources, and gold mining remains one of the most important sectors in the country’s mining industry. However, many gold deposits are characterized by relatively low grades and simple mineral compositions, which place higher demands on process design and operational stability. The Indonesia 100t/d Gold Mineral Processing Plant, undertaken by Xinhai Mining, is a representative example of how a carefully engineered leaching process can deliver reliable economic returns from low-grade gold ore.
Project Background
The ore used in this project contains gold as the only recoverable valuable element, with an average grade of 2.6g/t. While this grade is not high, the simplicity of the ore composition makes it suitable for cyanide leaching combined with activated carbon adsorption. During the early stage of the project, the client contacted Xinhai Mining to learn more about its EPC service model, which integrates mineral processing testwork, engineering design, equipment manufacturing, installation, and commissioning.
After gaining a deeper understanding of Xinhai Mining’s technical capabilities, the client visited Xinhai’s facilities in person. Through multiple rounds of communication, comparison, and evaluation, the two parties ultimately reached a cooperation agreement.
👉 [http://www.xinhaiore.com/case/11.html]
Crushing and Washing Stage
The crushing and washing stage is the first critical step in ensuring efficient downstream gold recovery. In this project, the raw ore is first washed using a cylindrical screen. This step effectively removes clay, mud, and fine impurities that could otherwise interfere with leaching efficiency and adsorption performance.
Large particles retained on the screen are sent to a hammer crusher, where they are reduced to a suitable particle size. Compared with more complex crushing systems, this configuration offers advantages such as low investment cost, simple structure, and easy maintenance. The result is a well-prepared ore feed that meets the requirements of the leaching process.
Leaching and Adsorption Process
The selection stage of this project adopts a pool immersion–adsorption process, which is particularly suitable for gold-only ores with stable properties. The precious liquid flow rate is approximately 40m³/h, and it is transported to three adsorption columns through chemical pumps.
Gold dissolved during cyanide leaching is adsorbed by activated carbon within the columns. This method ensures high gold recovery efficiency while maintaining stable operating conditions. The adsorption system is designed with sufficient redundancy to handle fluctuations in ore grade and liquid flow.
Middle and Lean Liquid Treatment
After the adsorption process, the solution is divided into middle liquid and lean liquid streams. The middle liquid enters the middle liquid tank and continues to circulate through chemical pumps, maintaining effective gold adsorption. The fully adsorbed lean liquid is transferred to the lean liquid tank and discharged only after cyanide ion removal, ensuring compliance with environmental and safety standards.
This systematic approach not only maximizes gold recovery but also reduces reagent consumption and minimizes environmental impact.
Desorption, Regeneration, and Smelting
The gold-loaded carbon is processed using an analytical desorption electrolysis system, which separates gold from activated carbon efficiently. After desorption, the activated carbon undergoes pickling and regeneration, restoring its adsorption capacity and extending its service life. The regeneration capacity is carefully matched with the desorption and electrolysis stages to ensure smooth operation.
Finally, the recovered gold is processed through smelting, producing gold doré that meets market requirements.
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Conclusion
The Indonesia 100t/d Gold Mineral Processing Plant demonstrates how a well-designed leaching and adsorption system can deliver stable performance for low-grade gold ore. By combining practical equipment selection, efficient adsorption technology, and a complete service model, Xinhai Mining provided a reliable solution that meets both economic and environmental goals. This project serves as a valuable reference for similar gold mining operations across Southeast Asia.
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