XML 252 R90.htm IDEA: XBRL DOCUMENT
v3.23.1

Note 12 - Share-based payments - Inputs for Measurement of Grant Date Fair Values and Share Units Granted (Details) | 12 Months Ended
--- | ---
Dec. 31, 2022 USD ($) $ / shares | Dec. 31, 2022 USD ($) $ / shares | Dec. 31, 2021 USD ($) $ / shares
Restricted stock units (RSUs) [member] |  |  |
Statement Line Items [Line Items] |  |  |
Risk free rate | 3.88% | 3.88% | 1.52%
Fair value (USD) | $ | $ 12.52 | $ 12.52 | $ 12.06
Share price (USD) (in dollars per share) | $ 12.40 |  | $ 11.71
Volatility | 1.29% | 1.29% | 1.20%
RSU dividends reinvested | 1,980 | 1,980 | 1,066
Settlements/terminations | 0 | 0 | 0
Total awards | 19,565 | 19,565 | 18,651
Restricted stock units (RSUs) [member] | January 11, 2019 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Grants | 0 | 0 | 0
Restricted stock units (RSUs) [member] | March 23, 2019 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Grants | 0 | 0 | 0
Restricted stock units (RSUs) [member] | June 8, 2019 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Grants | 0 | 0 | 0
Restricted stock units (RSUs) [member] | January 11, 2020 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Grants | 17,585 | 17,585 | 17,585
Restricted stock units (RSUs) [member] | March 31, 2020 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Grants | 0 | 0 | 0
Restricted stock units (RSUs) [member] | June 1, 2020 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Grants | 0 | 0 | 0
Restricted stock units (RSUs) [member] | September 9, 2020 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Grants | 0 | 0 | 0
Restricted stock units (RSUs) [member] | September 14, 2020 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Grants | 0 | 0 | 0
Restricted stock units (RSUs) [member] | October 5, 2020 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Grants | 0 | 0 | 0
Restricted stock units (RSUs) [member] | January 11, 2021 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Grants | 0 | 0 | 0
Restricted stock units (RSUs) [member] | April 1, 2021 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Grants | 0 | 0 | 0
Restricted stock units (RSUs) [member] | May 14, 2021 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Grants | 0 | 0 | 0
Restricted stock units (RSUs) [member] | June 1, 2021 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Grants | 0 | 0 | 0
Restricted stock units (RSUs) [member] | June 14, 2021 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Grants | 0 | 0 | 0
Restricted stock units (RSUs) [member] | August 13, 2021 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Grants | 0 | 0 | 0
Restricted stock units (RSUs) [member] | September 1, 2021 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Grants | 0 | 0 | 0
Restricted stock units (RSUs) [member] | September 6, 2021 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Grants | 0 | 0 | 0
Restricted stock units (RSUs) [member] | September 20, 2021 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Grants | 0 | 0 | 0
Restricted stock units (RSUs) [member] | October 1, 2021 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Grants | 0 | 0 | 0
Restricted stock units (RSUs) [member] | October 11, 2021 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Grants | 0 | 0 | 0
Restricted stock units (RSUs) [member] | November 12, 2021 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Grants | 0 | 0 | 0
Restricted stock units (RSUs) [member] | December 1, 2021 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Grants | 0 | 0 | 0
Restricted stock units (RSUs) [member] | January 11, 2022 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Grants | 0 | 0 | 0
Restricted stock units (RSUs) [member] | January 12, 2022 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Grants | 0 | 0 | 0
Restricted stock units (RSUs) [member] | May 13, 2022 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Grants | 0 | 0 | 0
Restricted stock units (RSUs) [member] | June 1, 2022 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Grants | 0 | 0 | 0
Restricted stock units (RSUs) [member] | July 1, 2022 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Grants | 0 | 0 | 0
Restricted stock units (RSUs) [member] | October 1, 2022 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Grants | 0 | 0 | 0
Performance share units (PSUs) [member] |  |  |
Statement Line Items [Line Items] |  |  |
Risk free rate | 3.88% | 3.88% | 1.52%
Fair value (USD) | $ | $ 12.42 | $ 12.42 | $ 11.63
Share price (USD) (in dollars per share) | $ 12.42 |  | $ 11.71
Volatility | 0.91% | 0.91% | 1.06%
RSU dividends reinvested | 0 | 0 | 0
Settlements/terminations | (254,491) | (254,491) | (30,600)
Total awards | 224,408 | 224,408 | 343,379
Performance share units (PSUs) [member] | Bottom of range [member] |  |  |
Statement Line Items [Line Items] |  |  |
Performance multiplier percentage | 93.00% | 93.00% | 93.00%
Performance share units (PSUs) [member] | Top of range [member] |  |  |
Statement Line Items [Line Items] |  |  |
Performance multiplier percentage | 100.00% | 100.00% | 100.00%
Performance share units (PSUs) [member] | January 11, 2019 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Grants | 95,740 | 95,740 | 95,740
Performance share units (PSUs) [member] | March 23, 2019 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Grants | 28,287 | 28,287 | 28,287
Performance share units (PSUs) [member] | June 8, 2019 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Grants | 14,672 | 14,672 | 14,672
Performance share units (PSUs) [member] | January 11, 2020 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Grants | 114,668 | 114,668 | 114,668
Performance share units (PSUs) [member] | March 31, 2020 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Grants | 1,971 | 1,971 | 1,971
Performance share units (PSUs) [member] | June 1, 2020 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Grants | 1,740 | 1,740 | 1,740
Performance share units (PSUs) [member] | September 9, 2020 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Grants | 1,611 | 1,611 | 1,611
Performance share units (PSUs) [member] | September 14, 2020 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Grants | 20,686 | 20,686 | 20,686
Performance share units (PSUs) [member] | October 5, 2020 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Grants | 514 | 514 | 514
Performance share units (PSUs) [member] | January 11, 2021 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Grants | 78,875 | 78,875 | 78,875
Performance share units (PSUs) [member] | April 1, 2021 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Grants | 770 | 770 | 770
Performance share units (PSUs) [member] | May 14, 2021 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Grants | 2,389 | 2,389 | 2,389
Performance share units (PSUs) [member] | June 1, 2021 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Grants | 1,692 | 1,692 | 1,692
Performance share units (PSUs) [member] | June 14, 2021 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Grants | 507 | 507 | 507
Performance share units (PSUs) [member] | August 13, 2021 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Grants | 2,283 | 2,283 | 2,283
Performance share units (PSUs) [member] | September 1, 2021 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Grants | 553 | 553 | 553
Performance share units (PSUs) [member] | September 6, 2021 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Grants | 531 | 531 | 531
Performance share units (PSUs) [member] | September 20, 2021 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Grants | 526 | 526 | 526
Performance share units (PSUs) [member] | October 1, 2021 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Grants | 2,530 | 2,530 | 2,530
Performance share units (PSUs) [member] | October 11, 2021 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Grants | 500 | 500 | 500
Performance share units (PSUs) [member] | November 12, 2021 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Grants | 1,998 | 1,998 | 1,998
Performance share units (PSUs) [member] | December 1, 2021 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Grants | 936 | 936 | 936
Performance share units (PSUs) [member] | January 11, 2022 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Grants | 96,359 | 96,359 | 0
Performance share units (PSUs) [member] | January 12, 2022 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Grants | 825 | 825 | 0
Performance share units (PSUs) [member] | May 13, 2022 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Grants | 2,040 | 2,040 | 0
Performance share units (PSUs) [member] | June 1, 2022 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Grants | 1,297 | 1,297 | 0
Performance share units (PSUs) [member] | July 1, 2022 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Grants | 2,375 | 2,375 | 0
Performance share units (PSUs) [member] | October 1, 2022 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Grants | 2,024 | 2,024 | 0
Equity-settled performance units (EPUs) [member] |  |  |
Statement Line Items [Line Items] |  |  |
Fair value (USD) | $ | $ 10.15 | $ 10.15 |
Share price (USD) (in dollars per share) | $ 11.50 |  |
Performance multiplier percentage | 100.00% | 100.00% |
Total awards | 130,380 | 130,380 |
Holding period on shares issued (Year) | 1 year | 1 year |
Share option programs [member] |  |  |
Statement Line Items [Line Items] |  |  |
Options granted | 20,000 | 20,000 |
Expected option life in years | 10 | 10 |
Share option programs [member] | February 27, 2018 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Risk free rate | 2.86% | 2.86% |
Share price (USD) (in dollars per share) |  | $ 9.30 |
Volatility | 32.00% | 32.00% |
Options granted | 10,000 | 10,000 |
Holding period on shares issued (Year) | 0 years | 0 years |
Exercise price (in CAD per share) |  | $ 9.30 |
Expected option life in years | 3 | 3 |
Share option programs [member] | September 30, 2022 [member] |  |  |
Statement Line Items [Line Items] |  |  |
Risk free rate | 4.00% | 4.00% |
Share price (USD) (in dollars per share) | $ 9.82 |  |
Volatility | 102.00% | 102.00% |
Options granted | 10,000 | 10,000 |
Holding period on shares issued (Year) | 1 year | 1 year |
Exercise price (in CAD per share) | $ 9.49 |  |
Expected option life in years | 3 | 3 |

X
- Definition The minimum holding period of other equity instruments. + References No definition available. + Details
Name: | cmcl_MinimumHoldingPeriodOfOtherEquityInstruments
Namespace Prefix: | cmcl_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of other equity instruments (ie other than share options) granted in a share-based payment arrangement as a result of dividends being re-invested. + References No definition available. + Details
Name: | cmcl_NumberOfOtherEquityInstrumentsGrantedInSharebasedPaymentArrangementFromDividends
Namespace Prefix: | cmcl_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

X
- Definition The performance multiplier if performance conditions have been met. + References No definition available. + Details
Name: | cmcl_PerformanceMultiplier
Namespace Prefix: | cmcl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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 expected volatility of the share price used to calculate the fair value of the share options granted. Expected volatility is a measure of the amount by which a price is expected to fluctuate during a period. The measure of volatility used in option pricing models is the annualised standard deviation of the continuously compounded rates of return on the share over a period of time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2021-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_DescriptionOfExpectedVolatilityShareOptionsGranted
Namespace Prefix: | ifrs-full_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The option life of share options granted. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2021-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_DescriptionOfOptionLifeShareOptionsGranted
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

X
- Definition The implied yield currently available on zero-coupon government issues of the country in whose currency the exercise price for share options granted is expressed, with a remaining term equal to the expected term of the option being valued (based on the option's remaining contractual life and taking into account the effects of expected early exercise). [Refer: Government [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2021-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_DescriptionOfRiskFreeInterestRateShareOptionsGranted
Namespace Prefix: | ifrs-full_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The exercise price of share options granted. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2021-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_ExercisePriceShareOptionsGranted2019
Namespace Prefix: | ifrs-full_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of other equity instruments (ie other than share options) granted in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2021-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_47_b&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2021-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of other equity instruments (ie other than share options) exercised or vested in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2021-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_NumberOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of other equity instruments (ie other than share options) outstanding in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2021-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of share options outstanding in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2021-01-01 -Paragraph 45 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45_d&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2021-01-01 -Paragraph 45 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45_b_i&doctype=Standard -URIDate 2021-03-24 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2021-01-01 -Paragraph 45 -Subparagraph b -Clause vi -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45_b_vi&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_NumberOfOutstandingShareOptions
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition The weighted average fair value at the measurement date of granted equity instruments other than share options. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2021-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_47_b&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_WeightedAverageFairValueAtMeasurementDateOtherEquityInstrumentsGranted
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The weighted average share price used as input to the option pricing model to calculate the fair value of share options granted. [Refer: Option pricing model [member]; Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2021-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_WeightedAverageSharePriceShareOptionsGranted2019
Namespace Prefix: | ifrs-full_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=cmcl_RestrictedStockUnitsRsusMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CreationDateAxis=cmcl_January112019Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CreationDateAxis=cmcl_March232019Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CreationDateAxis=cmcl_June82019Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CreationDateAxis=cmcl_January112020Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CreationDateAxis=cmcl_March312020Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CreationDateAxis=cmcl_June12020Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CreationDateAxis=cmcl_September92020Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CreationDateAxis=cmcl_September142020Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CreationDateAxis=cmcl_October52020Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CreationDateAxis=cmcl_January112021Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CreationDateAxis=cmcl_April12021Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CreationDateAxis=cmcl_May142021Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CreationDateAxis=cmcl_June12021Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CreationDateAxis=cmcl_June142021Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CreationDateAxis=cmcl_August132021Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CreationDateAxis=cmcl_September12021Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CreationDateAxis=cmcl_September62021Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CreationDateAxis=cmcl_September202021Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CreationDateAxis=cmcl_October12021Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CreationDateAxis=cmcl_October112021Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CreationDateAxis=cmcl_November122021Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CreationDateAxis=cmcl_December12021Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CreationDateAxis=cmcl_January112022Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CreationDateAxis=cmcl_January122022Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CreationDateAxis=cmcl_May132022Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CreationDateAxis=cmcl_June12022Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CreationDateAxis=cmcl_July12022Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CreationDateAxis=cmcl_October12022Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=cmcl_PerformanceShareUnitsPsusMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=cmcl_EquitysettledPerformanceUnitsEpusMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=cmcl_ShareOptionProgramsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CreationDateAxis=cmcl_February272018Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CreationDateAxis=cmcl_September302022Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |