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SHARE BASED PAYMENTS (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Disclosure of terms and conditions of share-based payment arrangement [line items]
Expense from share-based payment transactions with employees	$ 10,311	$ 4,161
Stock options available for issuance	2,441,061
Deferred, Restricted and Performance Share Units
Disclosure of terms and conditions of share-based payment arrangement [line items]
Expense from share-based payment transactions with employees	$ 10,200	$ 3,800
Stock Options
Disclosure of terms and conditions of share-based payment arrangement [line items]
Expense from share-based payment transactions with employees	$ 100
Top of range [member] | Stock Options
Disclosure of terms and conditions of share-based payment arrangement [line items]
Maximum issue of shares permitted	12,200,000

X

- Definition

Number of shares authorized for issuance under share-based payment arrangement.

+ References

No definition available.

+ Details

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Namespace Prefix:	fsm_
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Balance Type:	na
Period Type:	duration

X

- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

No definition available.

+ Details

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Data Type:	xbrli:sharesItemType
Balance Type:	na
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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

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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 2022-03-24
-Paragraph 112
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2022-03-24

+ Details

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Period Type:	duration

X

- Details

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X

- Details

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Balance Type:
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X

- Details

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