XML 147 R119.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Income Taxes (Schedule of Tax Losses Expiry Dates) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Income Taxes [line items] |  |
Unused tax losses for which no deferred tax asset recognised | $ 73,994 | $ 55,500
CANADA |  |
Income Taxes [line items] |  |
Unused tax losses for which no deferred tax asset recognised | $ 74,300 | 55,500
CANADA | Bottom of range [member] |  |
Income Taxes [line items] |  |
Year of Expiry | 2025 |
CANADA | Top of range [member] |  |
Income Taxes [line items] |  |
Year of Expiry | 2037 |
ARGENTINA |  |
Income Taxes [line items] |  |
Unused tax losses for which no deferred tax asset recognised | $ 3,700 |
ARGENTINA | Bottom of range [member] |  |
Income Taxes [line items] |  |
Year of Expiry | 2018 |
ARGENTINA | Top of range [member] |  |
Income Taxes [line items] |  |
Year of Expiry | 2022 |
MEXICO |  |
Income Taxes [line items] |  |
Unused tax losses for which no deferred tax asset recognised | $ 332 | 450
MEXICO | Bottom of range [member] |  |
Income Taxes [line items] |  |
Year of Expiry | 2021 |
MEXICO | Top of range [member] |  |
Income Taxes [line items] |  |
Year of Expiry | 2025 |
BARBADOS |  |
Income Taxes [line items] |  |
Unused tax losses for which no deferred tax asset recognised | $ 266 | $ 185
BARBADOS | Bottom of range [member] |  |
Income Taxes [line items] |  |
Year of Expiry | 2022 |
BARBADOS | Top of range [member] |  |
Income Taxes [line items] |  |
Year of Expiry | 2024 |

X
- Definition Expiry year of tax loss carryforwards. + References No definition available. + Details
Name: | fsm_ExpiryYearOfTaxLossCarryforwards
Namespace Prefix: | fsm_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

X
- Definition Income Taxes [line items]. + References No definition available. + Details
Name: | fsm_IncomeTaxesLineItems
Namespace Prefix: | fsm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of unused tax losses for which no deferred tax asset is recognised in the statement of financial position. [Refer: Unused tax losses [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_e&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_UnusedTaxLossesForWhichNoDeferredTaxAssetRecognised
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=country_CA
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=country_AR
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=country_MX
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=country_BB
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |