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GENERAL AND ADMINISTRATION (Schedule of General And Administrative Expenses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
GENERAL AND ADMINISTRATION
General and administration	$ 63,811	$ 55,769
Workers' participation	587	241
General and administrative subtotal	64,398	56,010
Share-based payments	11,687	8,063
Total general and administrative expense	$ 76,085	$ 64,073

X

- Definition

The amount of general and administrative expense excluding sharebased payments.

+ References

No definition available.

+ Details

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Namespace Prefix:	fsm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of general and administrative expense excluding workers' participation.

+ References

No definition available.

+ Details

Name:	fsm_GeneralAndAdministrativeExpenseExcludingWorkersParticipation
Namespace Prefix:	fsm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Selling, General and Administrative [abstract].

+ References

No definition available.

+ Details

Name:	fsm_SellingGeneralAndAdministrativeAbstract
Namespace Prefix:	fsm_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Workers participation expense.

+ References

No definition available.

+ Details

Name:	fsm_WorkersParticipationExpense
Namespace Prefix:	fsm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of expense from share-based payment transactions with employees. [Refer: Expense from share-based payment transactions]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 112
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2024-03-27

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of expense relating to general and administrative activities of the entity.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 112
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2024-03-27

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration