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Note 30 - Financial Instruments - Exposure to Risk (Details) R in Thousands	Dec. 31, 2018 ZAR (R)	Dec. 31, 2018 USD ($)		Dec. 31, 2017 ZAR (R)	Dec. 31, 2017 USD ($)
Currency risk [member]
Statement Line Items [Line Items]
Net monetary assets/(liabilities) exposed	R 57	$ 1,968,000		R 57	$ 601,000
Currency risk [member] | Cash and cash equivalents [member]
Statement Line Items [Line Items]
Net monetary assets/(liabilities) exposed	57	8,147,000	[1]	57	601,000
Effect of possible strengthening or weakening	3	388,000		3	30,000
Currency risk [member] | Trade and other receivables [member]
Statement Line Items [Line Items]
Net monetary assets/(liabilities) exposed		126,000
Effect of possible strengthening or weakening		6,000
Currency risk [member] | Trade and other payables [member]
Statement Line Items [Line Items]
Net monetary assets/(liabilities) exposed		(345,000)
Effect of possible strengthening or weakening		(16,000)
Currency risk [member] | Term loan [member]
Statement Line Items [Line Items]
Net monetary assets/(liabilities) exposed		(5,960,000)	[1]
Effect of possible strengthening or weakening		(283,000)
Interest rate risk [member] | Cash and cash equivalents [member]
Statement Line Items [Line Items]
Net monetary assets/(liabilities) exposed		11,187,000			12,756,000
Interest rate risk [member] | Term loan facility [member]
Statement Line Items [Line Items]
Net monetary assets/(liabilities) exposed		5,960,000			1,486,000
Interest rate risk , increase by 100 basis points [member] | Cash and cash equivalents [member]
Statement Line Items [Line Items]
Effect of possible strengthening or weakening		(60)			(15)
Interest rate risk , increase by 100 basis points [member] | Term loan and bank overdraft [member]
Statement Line Items [Line Items]
Effect of possible strengthening or weakening		111,000			128,000
Interest rate risk, decrease by 100 basis points [member] | Cash and cash equivalents [member]
Statement Line Items [Line Items]
Effect of possible strengthening or weakening		60			15
Interest rate risk, decrease by 100 basis points [member] | Term loan and bank overdraft [member]
Statement Line Items [Line Items]
Effect of possible strengthening or weakening		$ (111,000)			$ (128,000)
[1] Of the cash and cash equivalents and term loan facility $6,560 (2017:Nil) and $5,960 (2017:Nil) are denominated in RTGS$ respectively.

X

- Definition

The effect on profit or loss and equity due to the various functional currencies against the foreign currencies.

+ References

No definition available.

+ Details

Name:	cmcl_FunctionalCurrenciesAgainstTheForeignCurrenciesEffectOnProfitOrLossAndEquity
Namespace Prefix:	cmcl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The monetary assets and liabilities denominated in foreign currencies which is different to the functional currency of the underlying entities, the profit or loss and equity in the underlying entities could be affected by movements between the functional currency and the foreign currency.

+ References

No definition available.

+ Details

Name:	cmcl_NetMonetaryAssetsliabilitiesExposed
Namespace Prefix:	cmcl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	cmcl_StatementLineItems
Namespace Prefix:	cmcl_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_TypesOfRisksAxis=ifrs-full_CurrencyRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfFinancialInstrumentsAxis=cmcl_CashAndCashEquivalentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfFinancialInstrumentsAxis=cmcl_TradeAndOtherReceivablesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfFinancialInstrumentsAxis=cmcl_TradeAndOtherPayablesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfFinancialInstrumentsAxis=cmcl_TermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_TypesOfRisksAxis=ifrs-full_InterestRateRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfFinancialInstrumentsAxis=cmcl_TermLoanFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_TypesOfRisksAxis=cmcl_InterestRateRiskIncreaseBy100BasisPointsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfFinancialInstrumentsAxis=cmcl_TermLoanAndBankOverdraftMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_TypesOfRisksAxis=cmcl_InterestRateRiskDecreaseBy100BasisPointsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: