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Trade and Other Receivables (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($)
Scenario Statement [Line Items]
VAT receivables sold amount	$ 5.5
Asset sold factor rate	5.00%
Scenario, Plan [Member]
Scenario Statement [Line Items]
VAT receivables sold amount	$ 0.9

X

- Definition

Asset sold factor rate.

+ References

No definition available.

+ Details

Name:	fsm_AssetSoldFactorRate
Namespace Prefix:	fsm_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Scenario Statement [Line Items].

+ References

No definition available.

+ Details

Name:	fsm_ScenarioStatementLineItems
Namespace Prefix:	fsm_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The fair value of collateral sold or repledged that was permitted to be sold or repledged in the absence of default by the owner of the collateral. [Refer: At fair value [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2021-01-01
-Paragraph 15
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_15_b&doctype=Standard
-URIDate 2021-03-24

+ Details

Name:	ifrs-full_AssetsSoldOrRepledgedAsCollateralAtFairValue
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: