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MATERIAL ACCOUNTING POLICIES (Narrative) (Details)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Caylloma
Significant Accounting Policies
Conversion factors related to inferred resources	90.00%	90.00%
Percentage of inferred resources	42.00%	50.00%
Yaramoko
Significant Accounting Policies
Conversion factors related to inferred resources	100.00%	100.00%
Percentage of inferred resources	9.00%	5.00%
Seguela
Significant Accounting Policies
Conversion factors related to inferred resources	100.00%	100.00%
Percentage of inferred resources	1.00%	1.00%
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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X

- Definition

Disclosure Of Significant Accounting Policies [line items].

+ References

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- Definition

Percentage of inferred resources.

+ References

No definition available.

+ Details

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X

- Definition

Share-based arrangement vesting period.

+ References

No definition available.

+ Details

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Namespace Prefix:	fsm_
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- Details

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X

- Details

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X

- Details

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X

- Details

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X

- Details

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