XML 10 R1.htm IDEA: XBRL DOCUMENT v3.22.2.2
Document And Entity Information - shares
 9 Months Ended
Sep. 30, 2022
Nov. 14, 2022
Document And Entity Information    
Document Type 10-Q  
Document Quarterly Report true  
Document Transition Report false  
Document Period End Date Sep. 30, 2022  
Entity File Number 001-39281  
Entity Registrant Name TMC THE METALS COMPANY INC.  
Entity Incorporation, State or Country Code A1  
Entity Tax Identification Number 00-0000000  
Entity Address, Address Line One 595 Howe Street, 10th Floor  
Entity Address, City or Town Vancouver  
Entity Address, State or Province BC  
Entity Address, Postal Zip Code V6C 2T5  
City Area Code 574  
Local Phone Number 252-9333  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company true  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   265,532,666
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2022  
Document Fiscal Period Focus Q3  
Entity Central Index Key 0001798562  
Entity Ex Transition Period false  
Amendment Flag false  
Common Shares, without par value    
Document And Entity Information    
Title of 12(b) Security Common Shares, without par value  
Trading Symbol TMC  
Security Exchange Name NASDAQ  
Redeemable warrants, each whole warrant exercisable for one Common Share, each at an exercise price of $11.50 per share    
Document And Entity Information    
Title of 12(b) Security Redeemable warrants, each whole warrant exercisable for one Common Share, each at an exercise price of $11.50 per share  
Trading Symbol TMCWW  
Security Exchange Name NASDAQ