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Related Party Transactions (Narrative) (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
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Gold Group Management Inc [member] |  |
Disclosure of transactions between related parties [line items] |  |
Amounts payable, related party transactions | $ 0 | $ 10,000

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- Definition The amounts payable resulting from related party transactions. [Refer: Related parties [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 24 -IssueDate 2017-01-01 -Paragraph 20 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=24&date=2017-03-01&anchor=para_20&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 24 -IssueDate 2017-01-01 -Paragraph 18 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=24&date=2017-03-01&anchor=para_18_b&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_AmountsPayableRelatedPartyTransactions
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=fsm_GoldGroupManagementIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |