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Note 41 - Subsequent Events (Details Textual)			3 Months Ended
	Mar. 09, 2022 USD ($)	Feb. 17, 2022 USD ($)	Mar. 31, 2022 USD ($)	Jul. 31, 2022 USD ($)	May 31, 2022 USD ($)
Abnormally large changes in asset prices or foreign exchange rates [member] | Zero cost contract to hedge 20,000 ounces of gold [member]
Statement Line Items [Line Items]
Derivative contract, number of ounces of gold hedged		20,000
Term of derivative contract (Month)		5 months
Hedging contract, cap		$ 1,940,000
Hedging contract, collar		$ 1,825,000
Derivative contract, number of ounces of gold hedged per month expiry		4,000
Abnormally large changes in asset prices or foreign exchange rates [member] | Call options to hedge ounces of gold [member]
Statement Line Items [Line Items]
Hedging instrument, liabilities	$ 796,000,000
Hedging instrument, ounces of gold hedged per month	4,000
Strike price per ounce				$ 2,200	$ 2,100
Impairment of assets [member] | Exploration and evaluation assets [member]
Statement Line Items [Line Items]
Impairment loss			$ 463,000

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

The number of ounces of gold hedged per month expiry of derivative contract.

+ References

No definition available.

+ Details

Name:	cmcl_DerivativeContractNumberOfOuncesOfGoldHedgedPerMonthExpiry
Namespace Prefix:	cmcl_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The cap of hedging contract.

+ References

No definition available.

+ Details

Name:	cmcl_HedgingContractCap
Namespace Prefix:	cmcl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The collar of hedging contract.

+ References

No definition available.

+ Details

Name:	cmcl_HedgingContractCollar
Namespace Prefix:	cmcl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

the number of ounces of gold hedged per month by hedging instrument.

+ References

No definition available.

+ Details

Name:	cmcl_HedgingInstrumentOuncesOfGoldHedgedPerMonth
Namespace Prefix:	cmcl_
Data Type:	xbrli:pureItemType
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 strike price per ounce.

+ References

No definition available.

+ Details

Name:	cmcl_StrikePricePerOunce
Namespace Prefix:	cmcl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The term of a derivative contract.

+ References

No definition available.

+ Details

Name:	cmcl_TermOfDerivativeContract
Namespace Prefix:	cmcl_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of a hedging instrument, recognised as a liability. [Refer: Hedging instruments [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2021-01-01
-Paragraph 24A
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_24A_a&doctype=Standard
-URIDate 2021-03-24

+ Details

Name:	ifrs-full_HedgingInstrumentLiabilities
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The amount recognised as a reduction of the carrying amount of an asset or cash-generating unit to its recoverable amount. [Refer: Carrying amount [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 36
-IssueDate 2021-01-01
-Paragraph 130
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2021-en-r&anchor=para_130_b&doctype=Standard
-URIDate 2021-03-24

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 36
-IssueDate 2021-01-01
-Paragraph 130
-Subparagraph d
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=36&code=ifrs-tx-2021-en-r&anchor=para_130_d_ii&doctype=Standard
-URIDate 2021-03-24

+ Details

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

X

- Details

Name:	ifrs-full_NonadjustingEventsAfterReportingPeriodAxis=ifrs-full_AbnormallyLargeChangesInAssetPricesOrForeignExchangeRatesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_TypesOfHedgesAxis=cmcl_ZeroCostContractToHedge20000OuncesOfGoldMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_TypesOfHedgesAxis=cmcl_CallOptionsToHedgeOuncesOfGoldMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_NonadjustingEventsAfterReportingPeriodAxis=cmcl_ImpairmentOfAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ifrs-full_ExplorationAndEvaluationAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: