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Note 21 - Disposal Group Held For Sale - Disposal Group Held For Sale (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Statement Line Items [Line Items]
Property, plant, and equipment	$ 214
Trade and other receivables	80
Cash and cash equivalents	2
Assets held for sale	296
Rehabilitation provision	602
Trade and other payables	7
Liabilities associated with assets held for sale	$ 609

X

- Definition

The amount of property, plant, and equipment that are classified as a part of a disposal group held for sale.

+ References

No definition available.

+ Details

Name:	cmcl_PropertyPlantAndEquipmentClassifiedAsPartOfDisposalGroupHeldForSale
Namespace Prefix:	cmcl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of rehablitation provision included in disposal groups classified held for sale.

+ References

No definition available.

+ Details

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

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 amount of trade and other payables included in disposal groups classified held for sale.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of trade and other receivables that are classified as a part of a disposal group held for sale.

+ References

No definition available.

+ Details

Name:	cmcl_TradeAndOtherReceivablesClassifiedAsPartOfDisposalGroupHeldForSale
Namespace Prefix:	cmcl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of cash and cash equivalents that are classified as a part of a disposal group held for sale. [Refer: Cash and cash equivalents; Disposal groups classified as held for sale [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 7
-IssueDate 2017-01-01
-Paragraph 45
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2017-03-01&anchor=para_45&doctype=Standard
-URIDate 2017-03-09

+ Details

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

X

- Definition

The amount of liabilities included in disposal groups classified as held for sale. [Refer: Liabilities; Disposal groups classified as held for sale [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 5
-IssueDate 2017-01-01
-Paragraph 38
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=5&date=2017-03-01&anchor=para_38&doctype=Standard
-URIDate 2017-03-09

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 54
-Subparagraph p
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_p&doctype=Standard
-URIDate 2017-03-09

+ Details

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

X

- Definition

The amount of non-current assets or disposal groups classified as held for sale. [Refer: Disposal groups classified as held for sale [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 5
-IssueDate 2017-01-01
-Paragraph 38
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=5&date=2017-03-01&anchor=para_38&doctype=Standard
-URIDate 2017-03-09

+ Details

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