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EARNINGS PER SHARE (Narrative) (Details) - shares	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
EARNINGS PER SHARE
Antidilutive securities excluded from computation of EPS	0	1,657,298
Antidilutive effect of convertible instruments on number Of ordinary shares	26,172,045	9,143,000

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- Definition

The number of anti dilutive potential ordinary shares that relate to the assumed conversion of the entity's convertible instruments exclude excluded from the calculation of diluted earnings per share.

+ References

No definition available.

+ Details

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Period Type:	duration

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- Definition

Number of antidilutive securities excluded from computation of earnings per share amount.

+ References

No definition available.

+ Details

Name:	fsm_NumberOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Namespace Prefix:	fsm_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration