Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2023	May 09, 2023
Document and Entity Information
Document Type	10-Q
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Mar. 31, 2023
Entity File Number	001-34852
Entity Registrant Name	Rare Element Resources Ltd
Entity Incorporation, State or Country Code	A1
Entity Tax Identification Number	00-0000000
Entity Address, Address Line One	P.O. Box 271049
Entity Address, City or Town	Littleton
Entity Address, State or Province	CO
Entity Address, Postal Zip Code	80127
City Area Code	720
Local Phone Number	278-2460
Title of 12(b) Security	None
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		212,613,451
Entity Central Index Key	0001419806
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2023
Amendment Flag	false