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SUBSEQUENT EVENTS (Details) - Disposal of major subsidiary [member] $ in Millions	Jan. 14, 2025 USD ($)
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: