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Contracts for inventory purchase commitment (Details)
 12 Months Ended
Dec. 31, 2019
Concentrate  
Disclosure of contracts for inventory purchase commitment [Line Items]  
Periods 2019 ~ 2030
Contracted amounts 38,990 Ton U3O8
Transformed  
Disclosure of contracts for inventory purchase commitment [Line Items]  
Periods 2019 ~ 2030
Contracted amounts 21,969 Ton U
Enrichment  
Disclosure of contracts for inventory purchase commitment [Line Items]  
Periods 2019 ~ 2030
Contracted amounts 17,060 Ton SWU
Molded (Light)  
Disclosure of contracts for inventory purchase commitment [Line Items]  
Periods 2019 ~ 2020
Contracted amounts 756 Ton U
Molded (Medium)  
Disclosure of contracts for inventory purchase commitment [Line Items]  
Periods 2019 ~ 2020
Contracted amounts 401 Ton U
Molded (Initial core)  
Disclosure of contracts for inventory purchase commitment [Line Items]  
Periods 2019 ~ 2022
Contracted amounts 415 Ton U