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v3.19.1

Deposits and Advances to Contractors (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Advance paid to contractors | $ 43,079 |
Lindero Project [member] |  |
Advance paid to contractors | 42,938 | $ 0
Caylloma Plant and Mine Equipment [member] |  |
Advance paid to contractors | $ 141 | $ 0

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- Definition The amount of long-term deposits held by the entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard -URIDate 2017-03-09 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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