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Note 15 - Derivative Financial Assets (Details Textual)	1 Months Ended	6 Months Ended		12 Months Ended
	Nov. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)	Apr. 30, 2020 USD ($)
Commodity price risk [member] | Derivative contract for 4,600 ounces of Gold [member]
Statement Line Items [Line Items]
Hedging instruments, participation, price	$ 379
Derivative contract, number of ounces of gold hedged	4,600
Hedging instruments, protected, price	$ 1,400
Hedged item, assets				$ 102,000
Hedging gains (losses) for hedge of group of items with offsetting risk positions		$ (102,000)	$ (324,000)
Gold ETF [member]
Statement Line Items [Line Items]
Derivative instrument, notional amount					$ 1,058,000
Trading income (expense) on foreign exchange contracts		(46,000)
Gains (losses) on change in value of foreign currency basis spreads, net of tax		$ 100,000

X

- Definition

The number of ounces hedged in a derivative contract.

+ References

No definition available.

+ Details

Name:	cmcl_DerivativeContractNumberOfOuncesOfGoldHedged
Namespace Prefix:	cmcl_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

No definition available.

+ Details

Name:	cmcl_DerivativeInstrumentNotionalAmount
Namespace Prefix:	cmcl_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The company would full participation if the market price of hedging assets rise above such price.

+ References

No definition available.

+ Details

Name:	cmcl_HedgingInstrumentsParticipationPrice
Namespace Prefix:	cmcl_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The company would be protected if the market price of hedging assets dip below such price.

+ References

No definition available.

+ Details

Name:	cmcl_HedgingInstrumentsProtectedPrice
Namespace Prefix:	cmcl_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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

X

- Definition

The gains (losses) recognised in other comprehensive income on change in value of foreign currency basis spreads, net of tax. [Refer: Other comprehensive income]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 91
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_91_a&doctype=Standard
-URIDate 2019-03-27

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of a hedged item, recognised as an asset. [Refer: Hedged items [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2019-01-01
-Paragraph 24B
-Subparagraph a
-Clause i
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_24B_a_i&doctype=Standard
-URIDate 2019-03-27

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The hedging gains (losses) for hedge of group of items with offsetting risk positions.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2019-01-01
-Paragraph 24C
-Subparagraph b
-Clause vi
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_24C_b_vi&doctype=Standard
-URIDate 2019-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 9
-IssueDate 2019-01-01
-Paragraph 6.6.4
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=9&code=ifrs-tx-2019-en-r&anchor=para_6.6.4&doctype=Standard
-URIDate 2019-03-27

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of trading income (expense) relating to foreign exchange contracts. [Refer: Trading income (expense)]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2019-03-27

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_HedgingInstrumentsAxis=cmcl_DerivativeContractFor4600OuncesOfGoldMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_TypesOfFinancialAssetsAxis=cmcl_GoldEtfMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: