Production costs by nature (Narrative) (Details)	12 Months Ended
Dec. 31, 2019
Ghana [Member]
Production Costs By Nature [Line Items]
Gross revenue royalty payable	5.00%

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.

No definition available.

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Namespace Prefix:	akg_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration