en.Wedoany.com Reported - China Shaanxi Coal Caojiatan Mining Co., Ltd. (referred to as "Caojiatan Mining") announced in June 2026 that its special project for underground coal gangue grouting and filling, built with an investment of 80 million yuan, has officially commenced operation. It can crush and prepare 150 tons of gangue slurry per hour, achieving on-site disposal of all coal gangue from the mine.
Located in Yulin City, Shaanxi Province, Caojiatan Mining is a key modern large-scale coal mining enterprise under the Shaanxi Coal and Chemical Industry Group, with its approved production capacity ranking among the top in the northern Shaanxi mining area. The disposal of coal gangue, a byproduct of coal mining, is a major challenge for green and low-carbon development in the mining area. Traditional gangue disposal methods, primarily open-pit stockpiling and external transport, face issues such as land occupation, pollution, and high transportation costs. Caojiatan Mining has abandoned this traditional model and built a dedicated underground gangue grouting and filling project. Leveraging mature grouting and filling technology, it converts industrial solid waste into filling material for underground goafs, achieving a closed-loop resource utilization of gangue.
According to Miao Yanping, Deputy Secretary of the Party Committee, Director, and General Manager of Caojiatan Mining, the gangue generated from mine production mainly consists of coal preparation gangue, with an average annual output of approximately 1.4 million tons. The first phase of the project has been completed and put into operation, with an existing annual disposal capacity of 1.4 million tons, capable of handling all coal preparation gangue produced daily by the mine. The main construction of the second phase is nearing completion; once operational, the entire system's annual gangue disposal capacity will increase to 2 million tons.
Based on actual production calculations, the comprehensive disposal cost of coal gangue grouting and filling is 70 yuan per ton, significantly reducing disposal expenses compared to traditional external transport and landfill or open-pit treatment methods. Large-scale centralized disposal lowers unit operation and maintenance costs, while full-process mechanization and assembly-line operations reduce labor input. This not only avoids hidden costs such as transportation fees, land occupation fees, and environmental fines associated with external gangue transport but also unlocks the resource value of waste gangue.
The coal gangue filling project at Caojiatan Mining has become a demonstration project for comprehensive solid waste management in the northern Shaanxi mining area. In the next step, the mine will continue to optimize filling process parameters, further explore the potential for gangue resource utilization, and provide a replicable technical pathway for green and low-carbon development in the mining area.
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