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v3.25.1

SUBSEQUENT EVENTS (Details) - Disposal of major subsidiary [member] $ in Millions | Jan. 14, 2025 USD ($)
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Disclosure of non-adjusting events after reporting period [line items] |
Percentage of interest disposed | 100.00%
Total consideration | $ 6
Consideration receivable on closing | 2
Consideration receivable remaining amount to be received in installments over 2 years | $ 4
Term of remaining consideration receivable | 2 years
Contingent consideration | $ 11
NSR royalty, percentage | 1.00%
Term of NSR royalty | 5 years

X
- Definition Amount of consideration receivable on closing for the disposal of assets and liabilities. + References No definition available. + Details
Name: | fsm_DisposalGroupConsiderationReceivableOnClosing
Namespace Prefix: | fsm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of maximum contingent consideration received or receivable for the disposal of assets and liabilities. + References No definition available. + Details
Name: | fsm_DisposalGroupMaximumContingentConsideration
Namespace Prefix: | fsm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of consideration receivable related to remaining amount on closing for the disposal of assets and liabilities. + References No definition available. + Details
Name: | fsm_DisposalGroupReceivableAggregateRemaining
Namespace Prefix: | fsm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the term for remaining consideration receivable for the disposal of assets and liabilities. + References No definition available. + Details
Name: | fsm_DisposalGroupRemainingConsiderationReceivableTerm
Namespace Prefix: | fsm_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of consideration received or receivable for the disposal of assets and liabilities. + References No definition available. + Details
Name: | fsm_DisposalGroupTotalConsideration
Namespace Prefix: | fsm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Net smelter return (NSR) royalty, percentage. + References No definition available. + Details
Name: | fsm_NetSmelterReturnRoyaltyPercentage
Namespace Prefix: | fsm_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the percentage of interest disposed. + References No definition available. + Details
Name: | fsm_PercentageOfInterestDisposed
Namespace Prefix: | fsm_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the term of net smelter return royalty. + References No definition available. + Details
Name: | fsm_TermOfNetSmelterReturnRoyalty
Namespace Prefix: | fsm_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_NonadjustingEventsAfterReportingPeriodAxis=ifrs-full_DisposalOfMajorSubsidiaryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |