v3.25.2
Cover
Jun. 16, 2025
Document Information [Line Items]  
Document Type 8-K
Amendment Flag false
Document Period End Date Jun. 16, 2025
Entity File Number 001-39281
Entity Registrant Name TMC the metals Co Inc.
Entity Central Index Key 0001798562
Entity Tax Identification Number 00-0000000
Entity Incorporation, State or Country Code A1
Entity Address, Address Line One 1111 West Hastings Street
Entity Address, Address Line Two 15th Floor
Entity Address, City or Town Vancouver
Entity Address, State or Province BC
Entity Address, Postal Zip Code V6E 2J3
City Area Code 888
Local Phone Number 458-3420
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company true
Elected Not To Use the Extended Transition Period false
T M C Common Shareswithoutparvalue [Member]  
Document Information [Line Items]  
Title of 12(b) Security TMC Common Shares without par value
Trading Symbol TMC
Security Exchange Name NASDAQ
Redeemablewarrantseachwholewarrant T M C Common Shareeachatanexercisepriceofdollar 1150pershare [Member]  
Document Information [Line Items]  
Title of 12(b) Security Redeemable warrants, each whole warrant exercisable for one TMC Common Share, each at an exercise price of $11.50 per share
Trading Symbol TMCWW
Security Exchange Name NASDAQ