Zijin Mining applies for patents related to tailings stacking method, constructing stacks with specific slag materials to reduce usage and achieve efficient industrialization.

On March 22, the State Intellectual Property Office’s information shows that Zijin Mining Group Co., Ltd. has applied for a patent titled “Stacking Method Using Gold Mine Heap Leaching Residue and Neutralization Residue as Carriers.” The application publication number is CN121669666A, the application number is CN202511716335.8, the publication date is March 17, 2026, and the application date is November 21, 2025. The inventors are Lai Caishu, Xu Jiansheng, Chen Shengyu, Lai Longhui, Liao Boneng, Guo Zhonghua, Chen Huacai, Huang Qinsong, Chen Yinlong, Qiu Jianqin, Huang Yaokun, Fan Jashen. The patent agency is Xiamen Shouchuang Junhe Patent Agency Co., Ltd., with patent agents Lin Xiangcheng and Yao Jianchuan. The classification codes are B09B3/32 and B09B101/55.

The patent abstract describes a stacking method using heap leaching residue and neutralization residue as carriers, including the following process steps and conditions: transportation and preliminary stacking; neutralization residue, reacted with copper-containing acidic wastewater from mining and lime, is filtered through a filter press and transported to designated stacking sites along with heap leaching residue at a ratio less than 8:1, to initially concentrate and stack the two types of residues; constructing a circular platform foundation, using a loader to operate in the middle area of the stacking site, mixing and layer-compacting the preliminary stacked neutralization residue and heap leaching residue to form a heap with a height of 6-8 meters, serving as the base for subsequent outward expansion; expanding the heap outward, continuously transporting the mixed neutralization residue and heap leaching residue at a ratio less than 8:1 to the edge of the platform, gradually expanding the heap along the circular platform; constructing a circular platform by leveling, pushing, and compacting the mixed residues at the edge with a loader, forming a circular platform with a radius of 6-10 meters, which can reduce the use of heap leaching residue by less than 10% and achieve efficient industrial-scale stacking.

Zijin Mining was established on September 6, 2000, and listed on the Shanghai Stock Exchange on April 25, 2008. Its registered address is in Fujian Province, with offices in Fujian and Hong Kong. It is a leading global mining company, with core business in mineral resource development, possessing full industry chain advantages, and is highly valuable for investment.

Zijin Mining’s main business involves mineral exploration and development, classified under Shenwan industry categories as Nonferrous Metals - Industrial Metals - Copper, involving concepts such as cobalt, nickel, state-owned assets in Fujian, and nonferrous (tin) sectors.

In terms of operational performance, in 2025, Zijin Mining’s revenue reached 349.079 billion yuan, ranking 1st in the industry, aligned with the industry average and median; net profit was 63.822 billion yuan, also ranking 1st, consistent with the industry average and median.

Recent patent applications by Zijin Mining Group Co., Ltd. include:

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