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Note 5 - Blanket Zimbabwe Indigenisation Transaction (Details Textual) - USD ($) $ in Thousands						2 Months Ended	5 Months Ended	7 Months Ended	12 Months Ended
		Jan. 20, 2020	Nov. 05, 2018	Jun. 23, 2017	Feb. 20, 2012	Apr. 30, 2013	Feb. 28, 2013	Sep. 30, 2012	Dec. 31, 2021	Dec. 31, 2020	Feb. 27, 2020	Dec. 31, 2019
Statement Line Items [Line Items]
Proportion of ownership interests held by non-controlling interests					51.00%				36.00%
Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity attributable to owners of parent					$ 30,090
Non-controlling interest, non-refundable donation					$ 1,000
Dividend loans, Percentage of dividend as payment of interest				80.00%	80.00%
Proportion of dividends declared accruing unconditionally					20.00%
Borrowings, interest rate				7.25%
Percentage of net assets recognised as NCI		13.20%			16.20%				13.20%	13.20%		16.20%
Proportion of ownership interest acquired			15.00%
Number of instruments or interests issued or issuable for cancellation of loan (in shares)		727,266
Non-controlling interests derecognized		$ 3,600
Reserve of share-based payments, increase (decrease) during period		$ 2,247
Proportion of ownership interest in subsidiary		64.00%
Cash advances on dividend loans						$ 1,000	$ 1,000	$ 2,000
Advancement of dividend loan [member]
Statement Line Items [Line Items]
Dividend loan, percent accrual											20.00%
Dividend loan, percent repaid											80.00%
NIEEF [member]
Statement Line Items [Line Items]
Proportion of ownership interests held by non-controlling interests					16.00%				16.00%
Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity attributable to owners of parent					$ 11,740
Proportion of ownership interest sold					16.00%
Non-controlling interests recognised, dividends declared accruing unconditionally					20.00%
Fremiro [member]
Statement Line Items [Line Items]
Proportion of ownership interests held by non-controlling interests					15.00%
Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity attributable to owners of parent					$ 11,010
Proportion of ownership interest sold					15.00%
Non-controlling interests recognised, dividends declared accruing unconditionally					20.00%
Non-controlling interests recognised, portion recognised to the extent net asset value exceeds faciliation loans					80.00%
BETS [member]
Statement Line Items [Line Items]
Proportion of ownership interests held by non-controlling interests	[1]								10.00%
Increase (decrease) through changes in ownership interests in subsidiaries that do not result in loss of control, equity attributable to owners of parent					$ 7,340
Proportion of ownership interest sold					10.00%
Community Trust [member]
Statement Line Items [Line Items]
Proportion of ownership interests held by non-controlling interests					10.00%				10.00%
Proportion of ownership interest sold					10.00%
Non-controlling interests recognised, dividends declared accruing unconditionally					100.00%
Non-controlling interests recognised, portion recognised to the extent net asset value exceeds faciliation loans					80.00%
Non-controlling interests recognised, dividends declared accruing unconditionally employee participation					20.00%
[1] Accounted for under IAS19 Employee Benefits.

X

- Definition

The cash outflow for advanced dividend loans made to non-controlling interests.

+ References

No definition available.

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Data Type:	xbrli:monetaryItemType
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X

- Definition

The percent of dividend loan that will continue to accrue.

+ References

No definition available.

+ Details

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Namespace Prefix:	cmcl_
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X

- Definition

The percent of a dividend loan that will be repaid.

+ References

No definition available.

+ Details

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X

- Definition

Percentage of dividends paid to determine amount of interest to pay on dividend loans.

+ References

No definition available.

+ Details

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X

- Definition

Amount of non-refundable donation paid by a subsidiary to a community trust.

+ References

No definition available.

+ Details

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X

- Definition

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+ References

No definition available.

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X

- Definition

NCI are recognised on the portion of shareholding upon which dividends declared accrue unconditionally to equity holders.

+ References

No definition available.

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X

- Definition

NCI are recognised on the portion of shareholding upon which dividends declared accrue unconditionally to equity holders with employee participation.

+ References

No definition available.

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X

- Definition

Percentage of NCI recognised to the extent that their attributable share of the net asset value of a subsidiary exceeds the balance on the facilitation loans including interest.

+ References

No definition available.

+ Details

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X

- Definition

The number of instruments or interests issued or issuable for the cancellation of facilitation loan.

+ References

No definition available.

+ Details

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X

- Definition

The percentage of net assets recognised as non-controlling interest.

+ References

No definition available.

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X

- Definition

Percentage of dividends declared that accrue unconditionally to equity holders.

+ References

No definition available.

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X

- Definition

Percentage of ownership interests acquired during the period.

+ References

No definition available.

+ Details

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X

- Definition

Percentage of ownership interests sold during the period.

+ References

No definition available.

+ Details

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X

- Definition

Represents amount of reserve of share-based payments increase (decrease) during period.

+ References

No definition available.

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- References

No definition available.

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X

- Definition

The interest rate on borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 7
-IssueDate 2021-01-01
-Paragraph 7
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_7&doctype=Standard
-URIDate 2021-03-24

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X

- Definition

The increase (decrease) in equity attributable to owners of the parent through changes in ownership interests in subsidiaries that do not result in loss of control. [Refer: Subsidiaries [member]; Equity attributable to owners of parent]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2021-01-01
-Paragraph 18
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2021-en-r&anchor=para_18&doctype=Standard
-URIDate 2021-03-24

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X

- Definition

The proportion of ownership interest in a subsidiary attributable to the entity. [Refer: Subsidiaries [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2021-01-01
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-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=27&code=ifrs-tx-2021-en-r&anchor=para_16_b_iii&doctype=Standard
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2021-en-r&anchor=para_19B_c&doctype=Standard
-URIDate 2021-03-24

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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 2021-01-01
-Paragraph 12
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2021-en-r&anchor=para_12_c&doctype=Standard
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