In the global wave of mining transformation towards "green, low-carbon, and sustainable development," mining projects no longer solely pursue economic benefits but also consider ecological protection and social responsibility, achieving synergistic development among the three. The 1200 tons/day gold processing plant in Tanzania, as a benchmark project for green mining in the region, achieves high recovery rates through the use of a full-sludge cyanidation process while effectively controlling pollutant emissions and promoting resource recycling through a series of environmental protection technologies and management measures, thus forging a sustainable mining development path suitable for local African conditions.
The safe management of cyanide is the core of environmental protection work in the full-sludge cyanidation process. This project addresses the highly toxic nature of cyanide by establishing a comprehensive safety management system: At the process level, the pH of the slurry is precisely adjusted to above 10.5 to suppress the generation of toxic gases from cyanide hydrolysis. Simultaneously, a highly efficient cyanide recovery system is employed to recycle unreacted cyanide, reducing cyanide consumption by over 30%. At the wastewater treatment level, a cyanide-crushing treatment workshop has been constructed, using bleaching powder oxidation to deeply treat cyanide-containing wastewater. The treated wastewater has a cyanide concentration below 0.5 mg/L, meeting local environmental emission standards and allowing it to be recycled for grinding, leaching, and other processes. This increases the water resource reuse rate to over 85%, effectively alleviating Tanzania's water shortage problem.
The compliant disposal and comprehensive utilization of tailings are another crucial aspect of the project's sustainable development. This project employs a "concentration-filtration-dry stacking" tailings treatment process. A high-efficiency filter press reduces the moisture content of the tailings to below 20%, forming a dry stack filter cake. This not only reduces the land area occupied by the tailings dam but also lowers the risk of soil and groundwater pollution from tailings leakage. Simultaneously, the project team conducted a systematic property analysis of the tailings, discovering that in addition to trace amounts of gold, the tailings also contain certain amounts of valuable elements such as sulfur and iron, possessing comprehensive recovery value. Based on this, the project has reserved interfaces for tailings reprocessing, allowing for the future recovery of valuable elements through bioleaching technology, turning waste into treasure and improving resource utilization. Furthermore, the project is also carrying out vegetation restoration work around the tailings dam, planting local native plants to reduce soil erosion and gradually achieve mine ecological restoration.
Optimizing energy consumption is a crucial measure in the project's green transformation. In the grinding and classification stage, a centrally aerated riser mixing system is used, reducing power consumption by 70% compared to traditional mechanical mixing tanks. In crushing and screening stages, high-efficiency energy-saving equipment is selected, resulting in an overall unit energy consumption reduction of 18% compared to similar gold mine concentrators. Meanwhile, the project fully utilizes Tanzania's abundant solar energy resources, planning and constructing a distributed photovoltaic power generation system. Once operational, this system will meet over 15% of the project's electricity needs, further reducing fossil fuel consumption and carbon emissions.
Sustainable development is not only reflected in the application of environmental protection technologies but also in harmonious coexistence with the local community. During construction and operation, the project prioritizes employing local staff, providing them with professional skills training and stable salaries and benefits, thus boosting local employment. Simultaneously, it invests in improving infrastructure in surrounding communities, constructing roads and water supply facilities, enhancing the quality of life for local residents. Furthermore, the project strictly adheres to Tanzanian mining regulations and environmental policies, regularly conducting environmental monitoring and public disclosure, and proactively accepting supervision from the local government and community, establishing a responsible mining company image.
The experience of the 1200 tons/day gold mine beneficiation plant in Tanzania demonstrates that mining projects can achieve a balance of economic, ecological, and social benefits through process optimization, the application of environmental technologies, and community collaboration. Against the backdrop of the global green mining transformation, this project's sustainable development experience provides valuable lessons for similar gold mining projects in Africa and globally, driving the mining industry towards greater efficiency, environmental friendliness, and social responsibility.
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