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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.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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