v3.26.1
Cover - shares
 9 Months Ended
May 31, 2026
Jun. 30, 2026
Cover [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Quarterly Report true  
Document Transition Report false  
Document Period End Date May 31, 2026  
Document Fiscal Period Focus Q3  
Document Fiscal Year Focus 2026  
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 527 21st Street  
Entity Address, Address Line Two #44  
Entity Address, City or Town Galveston  
Entity Address, State or Province TX  
Entity Address, Postal Zip Code 77550  
City Area Code (915)  
Local Phone Number 369-2133  
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   88,339,693