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v3.23.1

TRADE AND OTHER RECEIVABLES (Narrative) (Details) $ in Millions | Dec. 31, 2021 USD ($)
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Scenario Statement [Line Items] |
VAT receivables sold amount | $ 0.9

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- 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

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- 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 2022-03-24 -Paragraph 15 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_15_b&doctype=Standard -URIDate 2022-03-24 + Details
Name: | ifrs-full_AssetsSoldOrRepledgedAsCollateralAtFairValue
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant