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Note 5 - Blanket Zimbabwe Indigenisation Transaction - Shareholder Percentages and Facilitation Loan Balances (Details) - USD ($) $ in Thousands		12 Months Ended
	Feb. 20, 2012	Dec. 31, 2017	Dec. 31, 2016
Statement Line Items [Line Items]
Shareholding	51.00%	51.00%
NCI Recognized		16.20%
NCI subject to facilitation loans		24.80%
Faciliation loans		$ 31,052	$ 31,460
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		$ 11,879	11,990
Fremiro [member]
Statement Line Items [Line Items]
Shareholding	15.00%	15.00%
NCI Recognized		3.00%
NCI subject to facilitation loans		12.00%
Faciliation loans		$ 11,504	11,682
Community Trust [member]
Statement Line Items [Line Items]
Shareholding	10.00%	10.00%
NCI Recognized		10.00%
Faciliation loans
BETS [member]
Statement Line Items [Line Items]
Shareholding		10.00%
Faciliation loans		$ 7,669	$ 7,788

X

- Definition

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

+ References

No definition available.

+ Details

Name:	cmcl_FacilitationLoans
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

Name:	cmcl_NCISubjectToFacilitationLoans
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 2017-01-01
-Paragraph 12
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_12_c&doctype=Standard
-URIDate 2017-03-09

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X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Balance Type:
Period Type: