v3.26.3
Document and Entity Information
 12 Months Ended
Jun. 30, 2026
shares
Document and Entity Information  
Document Type 20-F
Document Registration Statement false
Document Annual Report true
Document Period End Date Jun. 30, 2026
Document Transition Report false
Document Shell Company Report false
Entity File Number 001-43199
Entity Registrant Name Guardian Metal Resources PLC
Entity Incorporation, State or Country Code X0
Entity Address, Address Line One 25 Eccleston Place
Entity Address, City or Town London
Entity Address, Postal Zip Code SW1W 9NF
Entity Address, Country GB
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 Emerging Growth Company true
Entity Ex Transition Period false
ICFR Auditor Attestation Flag false
Document Financial Statement Error Correction [Flag] false
Document Accounting Standard International Financial Reporting Standards
Entity Shell Company false
Entity Common Stock, Shares Outstanding 194,807,981
Entity Central Index Key 0002039972
Current Fiscal Year End Date --06-30
Document Fiscal Year Focus 2026
Document Fiscal Period Focus FY
Amendment Flag false
Auditor Name PKF Littlejohn LLP
Auditor Location London, England
Auditor Firm ID 2814
Ordinary shares, with a nominal value of £0.01 per share  
Document and Entity Information  
Title of 12(b) Security Ordinary shares, with a nominal value of £0.01 per share
No Trading Symbol Flag true
American Depositary Shares, each representing five (5) ordinary shares  
Document and Entity Information  
Title of 12(b) Security American Depositary Shares, each representing five (5) ordinary shares
Trading Symbol GMTL
Security Exchange Name NYSEAMER
Business Contact  
Document and Entity Information  
Contact Personnel Name Oliver Friesen
Contact Personnel Email Address oliver.friesen@guardianmetalresources.com
Entity Address, Address Line One 25 Eccleston Place
Entity Address, City or Town London
Entity Address, Postal Zip Code SW1W 9NF
Entity Address, Country GB
City Area Code +44
Local Phone Number 207 0788 496