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v3.25.1

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

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- References No definition available. + Details
Name: | ifrs-full_EarningsPerShareAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration