XML 130 R104.htm IDEA: XBRL DOCUMENT
v3.19.1

Closure and Rehabilitation Provisions (Schedule of Estimates Used in Closure and Rehabilitation Provisions) (Details) - Provision for decommissioning, restoration and rehabilitation costs [member] $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($)
Disclosure of other provisions [line items] |
Undiscounted estimated cash flow | $ 17,907
Caylloma M&I Property [member] |
Disclosure of other provisions [line items] |
Undiscounted estimated cash flow | $ 11,263
Estimated life of mine (years) | 10 years
Discount rate | 4.37%
Inflation rate | 2.00%
Caylloma M&I Property [member] | Bottom of range [member] |
Disclosure of other provisions [line items] |
Anticipated settlement date | 2022
Caylloma M&I Property [member] | Top of range [member] |
Disclosure of other provisions [line items] |
Anticipated settlement date | 2027
San Jose M&I Property [member] |
Disclosure of other provisions [line items] |
Undiscounted estimated cash flow | $ 4,991
Estimated life of mine (years) | 6 years
Discount rate | 8.62%
Inflation rate | 3.72%
San Jose M&I Property [member] | Bottom of range [member] |
Disclosure of other provisions [line items] |
Anticipated settlement date | 2025
San Jose M&I Property [member] | Top of range [member] |
Disclosure of other provisions [line items] |
Anticipated settlement date | 2037
Lindero Project [member] |
Disclosure of other provisions [line items] |
Undiscounted estimated cash flow | $ 1,653
Estimated life of mine (years) | 14 years
Discount rate | 2.87%
Inflation rate | 2.20%
Lindero Project [member] | Bottom of range [member] |
Disclosure of other provisions [line items] |
Anticipated settlement date | 2029
Lindero Project [member] | Top of range [member] |
Disclosure of other provisions [line items] |
Anticipated settlement date | 2042

X
- Definition Anticipated other provision settlement date. + References No definition available. + Details
Name: | fsm_AnticipatedOtherProvisionSettlementDate
Namespace Prefix: | fsm_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

X
- Definition Major assumptions made concerning future events other provisions discount rate. + References No definition available. + Details
Name: | fsm_MajorAssumptionsMadeConcerningFutureEventsOtherProvisionsDiscountRate
Namespace Prefix: | fsm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Major Assumptions Made Concerning Future Events Other Provisions Estimated Life. + References No definition available. + Details
Name: | fsm_MajorAssumptionsMadeConcerningFutureEventsOtherProvisionsEstimatedLife
Namespace Prefix: | fsm_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Major assumptions made concerning future events other provisions inflation rate. + References No definition available. + Details
Name: | fsm_MajorAssumptionsMadeConcerningFutureEventsOtherProvisionsInflationRate
Namespace Prefix: | fsm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Other provisions undiscounted cash flows. + References No definition available. + Details
Name: | fsm_OtherProvisionsUndiscountedCashFlows
Namespace Prefix: | fsm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Details
Name: | ifrs-full_ClassesOfProvisionsAxis=ifrs-full_ProvisionForDecommissioningRestorationAndRehabilitationCostsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=fsm_CayllomaMeasuredAndIndicatedPropertyMember
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_ClassesOfPropertyPlantAndEquipmentAxis=fsm_SanJoseMeasuredAndIndicatedPropertyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=fsm_LinderoProjectMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |