Hard rock uranium mines are an important part of China's natural uranium production capacity. Due to policy adjustments, many hard rock uranium mines are currently in a maintenance state. Production facilities such as ore mining and hydrometallurgy processes are stopped, and only tailings(slag) storage, wastewater treatment and other waste treatment facilities maintain operation. There is a significant difference in radioactive waste emissions from the production period, with an overall reduction in the number and release of source items, and significantly reducing the radiation impact on the surrounding environment and the public. After the shutdown of a typical hard rock uranium mine, the radon concentration and individual dose contribution values decreased by 25.4% to 44.5%. Based on the characteristics of the source terms during the maintenance period, optimization suggestions for environmental protection measures during the maintenance period of hard rock uranium mines are proposed to further reduce the source terms. At the same time, an adjustment plan for effluent and environmental monitoring is provided to ensure timely detection of problems while reducing manpower and increasing maintenance workload, ensuring the radiation safety and controllability of the shutdown mines.

In response to the problems in resource reserve management, combined with the actual situation of a certain open-pit uranium molybdenum mine, a mining software management platform is adopted to establish the basic database and spatial model of the mine, and estimate the benchmark number of dynamic resource reserve management. Based on production data such as borehole measurement, sampling, ladder plane, and slope geological logging, establish and update multi-dimensional engineering information spatiotemporal data, construct different spatiotemporal relationships between ore bodies or blocks and the entire deposit, as well as algorithms for their area, shape, thickness, length, resource reserves, etc., and then reconstruct ore body or block models and estimate resource reserves, automatically realizing visualized dynamic management of resource reserves. The visualization and dynamic management of resource reserves can guide mining production in a timely manner through the rapid exploration and mining comparison, and can also provide services for the production exploration, mining design, and improvement of production planning of unexplored ore bodies or blocks. This management method has achieved good results in the production process of open-pit uranium molybdenum mines.

Taking a domestic uranium mine as the research object, a three-dimensional geological initial model of the deposit was constructed by the basic data such as drilling location, inclinometry, samples, and lithology for geological exploration of the deposit, and the resource reserves of the deposit were estimated. According to the deposit exploration, production exploration, and mining processes, the three-dimensional geological model, resource types, and development status of the ore bodies/blocks were dynamically updated. The logical relationships among three-dimensional models of mineral deposits at different times was constructed to realize the automatic monitoring of mineral resource retention, changes, and reasons for changes, in order to grasp the background of mineral resource quantity. The research on resource utilization was carried out, the annual and cumulative leaching rates was calculated, the recoverable reserves (confirmed reserves) of ore bodies/blocks were predicted based on mining production data, and the targeted resource utilization plans for different ore bodies/blocks were proposed accordingly to improve the resource utilization efficiency of the mine.

Against the background of growing global energy demand, the rate of extraction of various types of mineral resources is accelerating. However, with the increase of mining depth, the problem of high temperature and heat damage is gradually highlighted. The high temperature and heat damage not only affect the normal operation of various types of machinery and equipment, but also pose a serious threat to the safe production of the mine. The causes and effects of heat damage in mines were analyzed. At the same time, taking a hard rock uranium mine in the south of China as an example, through numerical simulation and other methods, the thermal and physical parameters of the surrounding rock of the mine, the geothermal field of the mine and the deep thermal environment were studied in depth, and on this basis, the existing problems of the mine were analysed, and the cooling technology was proposed.

Some uranium mining and metallurgy soil ²²⁶Ra background value can not be determined, because of historical background and decommissioning knowledge in the early year. Based on analyzing the influencing factors of soil ²²⁶Ra value, natural factors determine soil ²²⁶Ra background value and human factors cause the soil ²²⁶Ra value to rise. It is difficult to investigate soil ²²⁶Ra background value at the contaminated site. In order to reduce the influence of human factors, monitoring plan, minimum sample size, and investigation statistical method are researched from surrounding soil of the site. Based on an example of the uranium mining and metallurgy decommissioning site, the feasibility of the supplemental investigation method is verified. The investigation statistical method can provide support for the engineering design and practice of uranium mining and metallurgy decommissioning.

Aiming at the optimization problem of ore blending for multi-metal in open-pit mine, a multi-objective optimization mathematical model for ore blending of multi-metal in open-pit mine is established, which takes the minimum ore grade deviation and the lowest production cost as the optimization objectives, and comprehensively considers various constraints such as production capacity of ore point, ore output, ore grade, oxidation rate, equipment production capacity and quantity, lithology and beneficiation process requirements. A multi-objective optimization method for ore blending of multi-metal in open-pit mine based on SPEA2 and entropy weighted TOPSIS is proposed. The method is applied to the optimization of ore matching in Shangfanggou molybdenum mine. The results show that compared with the original ore blending plan, the ore grade deviation of the optimized ore blending plan is reduced by 73.60%, and the production cost is reduced by 20.99%.

The calcination process in uranium dioxide production is a crucial link that affects the indicators (tetravalent uranium) of uranium dioxide products. The mechanism of decomposition and reduction of AUC to produce UO₂ is discussed, and the main factors and control measures affecting the tetravalent uranium content in the product are identified. It is found that the oxidation of UO₂ leading to unacceptable tetravalent uranium levels cannot be directly measured but is a significant factor. Common reasons for tetravalent uranium levels being unacceptable, such as material abnormalities, equipment failures, and abnormal operations, are summarized. Equipment failures and abnormal operations are particularly prone to causing the oxidation of UO₂ leading to unacceptable tetravalent uranium levels. Therefore, the weak points in the quality of natural uranium dioxide product mainly lie in equipment failures during the calcination of AUC and abnormal operations in the cooling process.

The history of uranium mining & metallurgy industry in China is reviewed, and the status of radioactive waste management system and waste disposal are introduced. On basis of analyzing the existing problems, the basic idea, work target, key tasks and guarantee measures of uranium mining & metallurgy waste management are put forward, which can provide guidance for science management of uranium mining & metallurgy waste in the future.

In order to improve the production efficiency of mining enterprises and reduce production costs, choose west of Mengqiguer uranium P0 prospecting line as the pilot to study the layout principle and construction technology application of exploration and mining combined engineering. The practice shows that compared with the traditional construction process, the combination of exploration with mining not only achieves the purpose of geological exploration, but also meets the needs of mining and metallurgy production, and achieves the optimization of time benefit, economic benefit and environmental benefit.

The safety of uranium tailings pond is especially important, while static and dynamic mechanical characteristic of uranium tailings is the basement of safety analysis and evaluation of tailings pond. This paper took one of southern uranium tailings pond as research target, and by means of function fitting and picturizing, systematically studied the regularity of space-time distribution of uranium tailings layers, as well as transformation law and inner mechanism of physical, mechanical and dynamic characteristic of uranium tailings, including indexes such as density, void ratio, coefficient of consolidation, filtration coefficient, internal friction angle, cohesion, dynamic modulus of elasticity, dynamic shear modulus and damping ratio. The result can provide an important guiding significance for the construction, operation and safety analysis of uranium tailings pond.