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Note 6 - Blanket Zimbabwe Indigenisation Transaction - Shareholder Percentages and Facilitation Loan Balances (Details) - USD ($)
$ in Thousands

12 Months Ended

Feb. 20, 2012

Dec. 31, 2020

Dec. 31, 2019

^[1]

Statement Line Items [Line Items]

Shareholding

51.00%

36.00%

NCI Recognized

13.20%

NCI subject to facilitation loans

12.80%

Faciliation loans

$ 19,175

$ 30,974

NIEEF [member]

Statement Line Items [Line Items]

Shareholding

16.00%

16.00%

NCI Recognized

3.20%

NCI subject to facilitation loans

12.80%

Faciliation loans

$ 11,728

11,877

Fremiro [member]

Statement Line Items [Line Items]

Shareholding

15.00%

^[2]

NCI Recognized

^[2]

NCI subject to facilitation loans

^[2]

Faciliation loans

^[2]

11,458

Community Trust [member]

Statement Line Items [Line Items]

Shareholding

10.00%

10.00%

NCI Recognized

10.00%

NCI subject to facilitation loans

Faciliation loans

BETS [member]

Statement Line Items [Line Items]

Shareholding

^[3]

10.00%

NCI Recognized

^[4]

NCI subject to facilitation loans

^[4]

Faciliation loans

$ 7,447

$ 7,639

[1]	Facilitation loans are accounted for as equity instruments and are accordingly not recognised as loans receivable.
[2]	After Fremiro repurchase on January 20, 2020.
[3]	Accounted for under IAS19 Employee Benefits.
[4]	The shares held by BETS are effectively treated as treasury shares (see above).

X

- Definition

Amount of facilitation loans accounted for as equity instruments and accordingly not recognized as loans receivable.

+ References

No definition available.

+ Details

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

X

- Definition

The proportion of ownership interests held by non-controlling interests recognized.

+ References

No definition available.

+ Details

Name:	cmcl_NCIRecognised
Namespace Prefix:	cmcl_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The proportion of ownership interests by non-controlling interests recognized subject to facilitation loans

+ References

No definition available.

+ Details

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Namespace Prefix:	cmcl_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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

X

- Definition

The proportion of ownership interests in a subsidiary held by non-controlling interests. [Refer: Subsidiaries [member]; Non-controlling interests]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2020-01-01
-Paragraph 12
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2020-en-r&anchor=para_12_c&doctype=Standard
-URIDate 2020-01-01

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Period Type:	duration

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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

X

- Details

Name:	ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cmcl_CommunityTrustMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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