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v3.21.1

Other Assets (Narrative) (Details) $ in Thousands | 1 Months Ended
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Jan. 31, 2021 USD ($)
Recovery of Receivable [member] |
Disclosure of fair value measurement of assets [line items] |
Value added tax recovered | $ 11,300

X
- Definition Amount if cash inflow towards recovery of value added tax. + References No definition available. + Details
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Namespace Prefix: | fsm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_NonadjustingEventsAfterReportingPeriodAxis=fsm_RecoveryOfReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |