v3.22.2.2
Cover - USD ($)
 12 Months Ended
Aug. 31, 2022
Nov. 21, 2022
Feb. 28, 2022
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Aug. 31, 2022    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2022    
Current Fiscal Year End Date --08-31    
Entity File Number 000-53482    
Entity Registrant Name TEXAS MINERAL RESOURCES CORP.    
Entity Central Index Key 0001445942    
Entity Tax Identification Number 87-0294969    
Entity Incorporation, State or Country Code DE    
Entity Address, Address Line One 539 El Paso Street    
Entity Address, City or Town Sierra Blanca    
Entity Address, State or Province TX    
Entity Address, Postal Zip Code 79851    
City Area Code 361    
Local Phone Number 790-5831    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
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 Public Float     $ 89,281,646
Entity Common Stock, Shares Outstanding   72,896,053  
Auditor Name Ham, Langston & Brezina, L.L.P.    
Auditor Location Houston, Texas    
Auditor Firm ID 298