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Contracts for inventory purchase commitment (Details)
 12 Months Ended
Dec. 31, 2017
Concentrate [Member]  
Disclosure of contracts for inventory purchase commitment [Line Items]  
Periods 2017 ~ 2030
Contracted amounts 39,662 Ton U3O8
Transformed [Member]  
Disclosure of contracts for inventory purchase commitment [Line Items]  
Periods 2017 ~ 2030
Contracted amounts 22,934 Ton U
Enrichment [Member]  
Disclosure of contracts for inventory purchase commitment [Line Items]  
Periods 2017 ~ 2029
Contracted amounts 25,530 Ton SWU
Molded [Member]  
Disclosure of contracts for inventory purchase commitment [Line Items]  
Periods 2017 ~ 2022
Contracted amounts 2,004 Ton U