Investment in joint venture - Sensitivity analysis (Details) - Asanko Gold Mine (AGM) [Member] $ in Millions	12 Months Ended
Dec. 31, 2019 USD ($)
Investment In Joint Venture [Line Items]
Gold price (weighted average) assumption, sensitivity	+/- $100/oz
Gold price (weighted average) sensitivity, increase impact on recoverable amount (100% basis)	$ 98.6
Gold price (weighted average) sensitivity, decrease impact on recoverable amount (100% basis)	$ 130.3
Discount rate, assumption, sensitivity	+/- 1.0
Discount rate, sensitivity, increase impact on recoverable amount (100% basis)	$ 7.9
Discount rate, sensitivity, decrease impact on recoverable amount (100% basis)	$ 7.4

Represents amount of discount rate decrease sensitivity impact on recoverable amount.

No definition available.

Name:	akg_DiscountRateDecreaseSensitivityImpactOnRecoverableAmount
Namespace Prefix:	akg_
Data Type:	xbrli:monetaryItemType
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Represents amount of discount rate increase sensitivity impact on recoverable amount.

No definition available.

Name:	akg_DiscountRateIncreaseSensitivityImpactOnRecoverableAmount
Namespace Prefix:	akg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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Represents information of discount rate sensitivity description.

No definition available.

Name:	akg_DiscountRateSensitivityDescription
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Represents amount of gold price weighted average Decrease sensitivity impact on recoverable amount.

No definition available.

Name:	akg_GoldPriceWeightedAverageDecreaseSensitivityImpactOnRecoverableAmount
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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Represents amount of gold price weighted average increase sensitivity impact on recoverable amount.

No definition available.

Name:	akg_GoldPriceWeightedAverageIncreaseSensitivityImpactOnRecoverableAmount
Namespace Prefix:	akg_
Data Type:	xbrli:monetaryItemType
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Represents information of gold price weighted average sensitivity description.

No definition available.

Name:	akg_GoldPriceWeightedAverageSensitivityDescription
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Represents information of investment In Joint Venture.

No definition available.

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

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Period Type: