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Other Assets (Narrative) (Details) $ in Thousands	1 Months Ended
	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

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

X

- 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

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

X

- Details

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