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Mineral Property, Plant and Equipment (Royalties Payable) (Details)	Dec. 31, 2023
Mulatos1
Disclosure of detailed information about property, plant and equipment [line items]
Royalty rate	0.50%
Young-Davidson
Disclosure of detailed information about property, plant and equipment [line items]
Royalty rate	1.50%

X

- Definition

Royalty Rate

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	ifrs-full_SegmentsAxis=agi_MulatosSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
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Period Type: