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Management of Financial Risk (Disclosure of Nature and Extent Arising from Financial Instruments - Commodity Price Risk) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)
Gold Commodity Type [member] | Commodity price risk [member]
Disclosure of nature and extent of risks arising from financial instruments [line items]
Effect on Sales	$ 3,483
Change percentage, commodity	10.00%
Silver Commodity Type [member] | Commodity price risk [member]
Disclosure of nature and extent of risks arising from financial instruments [line items]
Effect on Sales	$ 6,708
Change percentage, commodity	10.00%
Lead Commodity [member] | Commodity price risk [member]
Disclosure of nature and extent of risks arising from financial instruments [line items]
Effect on Sales	$ 279
Change percentage, commodity	10.00%
Zinc Commodity [member] | Commodity price risk [member]
Disclosure of nature and extent of risks arising from financial instruments [line items]
Effect on Sales	$ 453
Change percentage, commodity	10.00%
Lead And Zinc Commodity [member]
Disclosure of nature and extent of risks arising from financial instruments [line items]
Percentage of production with forward sales and colloar swaps	50.00%

X

- Definition

Percentage change on commodity price percentage.

+ References

No definition available.

+ Details

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Namespace Prefix:	fsm_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of production with forward sales and colloar swaps.

+ References

No definition available.

+ Details

Name:	fsm_PercentageOfProductionWithForwardSalesAndColloarSwaps
Namespace Prefix:	fsm_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage price change on commodity effect on sales amount.

+ References

No definition available.

+ Details

Name:	fsm_PercentagePriceChangeEffectOnSalesAmount
Namespace Prefix:	fsm_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

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

X

- Details

Name:	fsm_TypeOfCommodityAxis=fsm_GoldCommodityTypeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_TypesOfRisksAxis=ifrs-full_CommodityPriceRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	fsm_TypeOfCommodityAxis=fsm_SilverCommodityTypeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	fsm_TypeOfCommodityAxis=fsm_LeadCommodityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	fsm_TypeOfCommodityAxis=fsm_ZincCommodityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	fsm_TypeOfCommodityAxis=fsm_LeadAndZincCommodityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: