en.Wedoany.com Reported - Shaanxi Xiaobaodang Mining Co., Ltd. in China has built a nationally leading intelligent gangue grouting and filling system, achieving collaborative disposal and on-site closed-loop consumption of coal gangue and mine water. The system was officially put into operation in January 2024, with an annual gangue processing capacity of 2 million tons. After stable operation, the maximum single-day filling volume exceeded 6,158 tons.
Located in Yulin City, Shaanxi Province, Xiaobaodang Mining is a large modern coal mining enterprise under Shaanxi Coal and Chemical Industry Group Co., Ltd. Its mine field covers approximately 220 square kilometers, with geological reserves exceeding 3 billion tons and an approved production capacity of over 20 million tons per year. To address environmental challenges posed by traditional open-pit coal gangue storage—such as land occupation, dust generation, soil erosion, and potential geological disasters—Xiaobaodang Mining uses an automated proportioning system to mix coal gangue produced underground with mine water into compliant filling slurry. This slurry is then transported via high-pressure pipelines over long distances to underground goaf areas for grouting and backfilling, ensuring that coal gangue is not left on the surface and mine water achieves zero discharge.
According to Li Jinchao, Deputy Secretary of the Enterprise Party Committee, the filling cost per ton of gangue is controlled within 70 yuan, offering significant economic advantages. This project has been selected as an advanced typical case for coal mine filling mining nationwide and has received a special award of 3 million yuan from Yulin City for comprehensive utilization of bulk industrial solid waste. On the ecological front, the annual on-site consumption of millions of tons of coal gangue saves approximately 4 hectares of land for gangue storage and reduces carbon dioxide emissions by 700,000 tons per year. In terms of safety, the precise filling of goaf voids with slurry fundamentally mitigates the risk of surface subsidence.
The "gangue + mine water" collaborative grouting and filling model of Xiaobaodang Mining provides a replicable demonstration sample for comprehensive solid waste management in large-scale underground mines.
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