v3.26.1
Cover - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2025
Mar. 31, 2026
Jun. 30, 2025
Document Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Transition Report false    
Document Financial Statement Error Correction [Flag] false    
Entity Interactive Data Current Yes    
ICFR Auditor Attestation Flag false    
Amendment Flag false    
Document Period End Date Dec. 31, 2025    
Document Fiscal Year Focus 2025    
Document Fiscal Period Focus FY    
Entity Information [Line Items]      
Entity Registrant Name GREENLAND MINES LTD    
Entity Central Index Key 0001907223    
Entity File Number 001-41340    
Entity Tax Identification Number 86-2727441    
Entity Incorporation, State or Country Code DE    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Shell Company false    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company true    
Entity Ex Transition Period false    
Entity Public Float     $ 52.6
Entity Contact Personnel [Line Items]      
Entity Address, Address Line One 1300 South Boulevard    
Entity Address, Address Line Two Unit D    
Entity Address, City or Town Charlotte    
Entity Address, State or Province NC    
Entity Address, Postal Zip Code 28203    
Entity Phone Fax Numbers [Line Items]      
City Area Code (833)    
Local Phone Number 931-6330    
Entity Listings [Line Items]      
Entity Common Stock, Shares Outstanding   121,238,660  
Common Stock      
Entity Listings [Line Items]      
Title of 12(b) Security Common Stock    
Trading Symbol GRML    
Security Exchange Name NASDAQ    
Warrants      
Entity Listings [Line Items]      
Title of 12(b) Security Warrants    
Trading Symbol GRMLW    
Security Exchange Name NASDAQ