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Exploration Contracts - Reconciliation of the Company's explorations contracts (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 USD ($)
Exploration Contracts |
Balance at the beginning | $ 43,150
Termination of Marawa Agreement | (199)
Balance at the end | 42,951
NORI Contract |
Exploration Contracts |
Balance at the beginning | 250
Balance at the end | 250
Marawa Option Agreement |
Exploration Contracts |
Balance at the beginning | 199
Termination of Marawa Agreement | (199)
TOML Contract |
Exploration Contracts |
Balance at the beginning | 42,701
Balance at the end | $ 42,701

X
- Definition Amount of exploration licenses. + References No definition available. + Details
Name: | tmc_ExplorationLicensesNoncurrent
Namespace Prefix: | tmc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount representing the termination of exploration license. + References No definition available. + Details
Name: | tmc_ExplorationLicensesTermination
Namespace Prefix: | tmc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | tmc_ScheduleOfBreakDownOfExplorationExpensesLineItems
Namespace Prefix: | tmc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=tmc_NoriExplorationContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=tmc_MarawaAgreementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=tmc_TongaOffshoreMiningLimitedExplorationContractMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |