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Document and Entity Information
 12 Months Ended
Dec. 31, 2019
shares
Document and Entity Information [Abstract]  
Entity Registrant Name Western Copper & Gold Corp
Entity Central Index Key 0001364125
Entity Current Reporting Status Yes
Current Fiscal Year End Date --12-31
Document Type 40-F
Document Period End Date Dec. 31, 2019
Entity Common Stock, Shares Outstanding 107,636,001
Document Fiscal Year Focus 2019
Document Fiscal Period Focus FY
Entity Emerging Growth Company true
Entity Ex Transition Period false
Amendment Flag false