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v3.19.1

Note 20 - Cash and Cash Equivalents (Details Textual) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 20, 2018 | Dec. 31, 2017 | Jun. 23, 2017 | Jun. 22, 2017
--- | --- | --- | --- | --- | ---
Statement Line Items [Line Items] |  |  |  |  |
Bank overdrafts |  |  | $ 311 |  |
Borrowings, interest rate |  | 6.00% |  | 7.25% |
Borrowings, adjustment to interest rate basis |  |  |  |  | 10.00%
Unsecured bank overdraft facility [member] |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |
Maximum borrowing capacity | 4,000 |  |  |  |
Bank overdrafts | $ 0 |  | $ 311 |  |
Borrowings, interest rate | 6.50% |  |  |  |
Borrowings, adjustment to interest rate basis | 4.65% |  |  |  |

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- Definition Maximum amount that can be borrowed on the facility. + References No definition available. + Details
Name: | cmcl_MaximumBorrowingCapacity
Namespace Prefix: | cmcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | cmcl_StatementLineItems
Namespace Prefix: | cmcl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount that has been withdrawn from an account in excess of existing cash balances. This is considered a short-term extension of credit by the bank. [Refer: Cash and cash equivalents] + 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
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Namespace Prefix: | ifrs-full_
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Balance Type: | credit
Period Type: | instant

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- Definition The adjustment to the basis (reference rate) used for calculation of the interest rate on borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_7&doctype=Standard -URIDate 2017-03-09 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition The interest rate on borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_7&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_BorrowingsInterestRate
Namespace Prefix: | ifrs-full_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | ifrs-full_BorrowingsByNameAxis=cmcl_UnsecuredBankOverdraftFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |