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MATERIAL ACCOUNTING POLICIES (Narrative) (Details)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
San Jose M&I Property
Significant Accounting Policies
Conversion factors related to inferred resources	0.00%	90.00%
Percentage of inferred resources	0.00%	31.00%
Caylloma M&I Property
Significant Accounting Policies
Conversion factors related to inferred resources	90.00%	90.00%
Percentage of inferred resources	50.00%	41.00%
Yaramoko M&I Property
Significant Accounting Policies
Conversion factors related to inferred resources	100.00%	100.00%
Percentage of inferred resources	5.00%	8.00%
Seguela M&I property
Significant Accounting Policies
Conversion factors related to inferred resources	100.00%
Percentage of inferred resources	1.00%
Lindero M&I Property
Significant Accounting Policies
Percentage of inferred resources	0.00%	0.00%
Restricted Share Units
Significant Accounting Policies
vesting period	3 years
Performance Share Units
Significant Accounting Policies
vesting period	3 years

X

- Definition

Conversion factors related to inferred resources.

+ References

No definition available.

+ Details

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Namespace Prefix:	fsm_
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X

- Definition

Disclosure Of Significant Accounting Policies [line items].

+ References

No definition available.

+ Details

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Namespace Prefix:	fsm_
Data Type:	xbrli:stringItemType
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X

- Definition

Percentage of inferred resources.

+ References

No definition available.

+ Details

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Namespace Prefix:	fsm_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Share-based arrangement vesting period.

+ References

No definition available.

+ Details

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Namespace Prefix:	fsm_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=fsm_SanJoseMeasuredAndIndicatedPropertyMember
Namespace Prefix:
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Period Type:

X

- Details

Name:	ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=fsm_CayllomaMeasuredAndIndicatedPropertyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=fsm_YaramokoMeasuredAndIndicatedPropertyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=fsm_SeguelaMeasuredAndIndicatedPropertyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=fsm_LinderoMeasuredAndIndicatedPropertyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=ifrs-full_RestrictedShareUnitsMember
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X

- Details

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