XML 134 R115.htm IDEA: XBRL DOCUMENT
v3.19.1

Note 26 - Share-based Expenses - Inputs for Measurement of Grant Date Fair Values and Share Units Granted (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2018 CAD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 CAD ($) | Dec. 31, 2016 CAD ($) | Dec. 31, 2016 USD ($)
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |
Options granted |  | 10,000 | [1] | 10,000 | [1] | 5,000 | [1] | 5,000 | [1] | 18,000 |
Risk-free interest rate |  | 2.86% |  | 2.86% |  | 2.40% |  | 2.40% |  |  |
Expected stock price volatility (based on historical volatility) |  | 32.00% |  | 32.00% |  | 118.00% |  | 118.00% |  |  |
Expected option life in years |  | 3 |  | 3 |  | 3 |  | 3 |  |  |
Exercise price | [1] |  |  | $ 9.30 |  |  |  | $ 8.10 |  |  |
Share price at grant date | [1] |  |  | $ 9.30 |  |  |  | $ 8.10 |  |  |
Fair value at grant date | [1] | $ 1.40 |  |  |  | $ 5.81 |  |  |  |  |
Options granted on December 21, 2015 [member] |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |
Options granted | [1] |  |  |  |  |  |  |  |  | 18,000 |
Risk-free interest rate |  |  |  |  |  |  |  |  |  | 0.53% |
Expected stock price volatility (based on historical volatility) |  |  |  |  |  |  |  |  |  | 119.00% |
Expected option life in years |  |  |  |  |  |  |  |  |  | 5 |
Exercise price | [1] |  |  |  |  |  |  |  |  | $ 11.50 |
Share price at grant date | [1] |  |  |  |  |  |  |  |  | $ 11.50 |
Fair value at grant date | [1] |  |  |  |  |  |  |  |  |  | $ 9.45
Restricted stock units (RSUs) [member] |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share price at grant date |  | 5.46 |  |  |  | 7.37 |  |  |  |  |
Fair value ($) |  | $ 5.46 |  |  |  | $ 7.37 |  |  |  |  |
Grants | [2] | 10,960 |  | 10,960 |  | 7,324 |  | 7,324 |  |  |
Total awards at December 31 | [2] | 92,130 |  |  |  | 88,494 |  |  |  |  |
Restricted stock units (RSUs) [member] | January 11, 2016 [member] |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |
Grants | [2] | 60,645 |  | 60,645 |  | 60,645 |  | 60,645 |  |  |
Restricted stock units (RSUs) [member] | March 23, 2016 [member] |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |
Grants | [2] | 10,965 |  | 10,965 |  | 10,965 |  | 10,965 |  |  |
Restricted stock units (RSUs) [member] | June 8, 2016 [member] |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |
Grants | [2] | 5,117 |  | 5,117 |  | 5,117 |  | 5,117 |  |  |
Restricted stock units (RSUs) [member] | January 19, 2017 [member] |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |
Grants | [2] | 4,443 |  | 4,443 |  | 4,443 |  | 4,443 |  |  |
Performance share units (PSUs) [member] |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share price at grant date |  | $ 5.46 |  |  |  | $ 7.37 |  |  |  |  |
Fair value ($) |  | $ 5.46 |  |  |  | $ 7.17 |  |  |  |  |
Performance multiplier percentage |  | 85.00% |  | 85.00% |  | 94.00% |  | 94.00% |  |  |
Grants | [2] |  |  |  |  |  |  |  |  |  |
Total awards at December 31 | [2] | 324,694 |  |  |  | 324,694 |  |  |  |  |
Performance share units (PSUs) [member] | January 11, 2016 [member] |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |
Grants | [2] | 242,579 |  | 242,579 |  | 242,579 |  | 242,579 |  |  |
Performance share units (PSUs) [member] | March 23, 2016 [member] |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |
Grants | [2] | 43,871 |  | 43,871 |  | 43,871 |  | 43,871 |  |  |
Performance share units (PSUs) [member] | June 8, 2016 [member] |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |
Grants | [2] | 20,470 |  | 20,470 |  | 20,470 |  | 20,470 |  |  |
Performance share units (PSUs) [member] | January 19, 2017 [member] |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |
Grants | [2] | 17,774 |  | 17,774 |  | 17,774 |  | 17,774 |  |  |
[1] | Amounts stated after the 1:5 share consolidation, refer note 19.
[2] | Amounts are presented after the 1:5 share consolidation that took place on June 26, 2017. All fractional entitlements due to the share consolidation were rounded down.

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 2017-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_47_a_i&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_47_a_i&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_47_a_i&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_47_a_i&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_ExercisePriceShareOptionsGranted
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
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 2017-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_47_b&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45&doctype=Standard -URIDate 2017-03-09 + 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) outstanding in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45&doctype=Standard -URIDate 2017-03-09 + 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 granted in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 45 -Subparagraph b -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45_b_ii&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_NumberOfShareOptionsGrantedInSharebasedPaymentArrangement
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

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 2017-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_47_b&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_WeightedAverageFairValueAtMeasurementDateOtherEquityInstrumentsGranted
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The weighted average fair value of share options granted during the period at the measurement date. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 47 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_47_a&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_WeightedAverageFairValueAtMeasurementDateShareOptionsGranted
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The weighted average share price. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 45 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45_c&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_WeightedAverageSharePrice
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=cmcl_OptionsGrantedOnDecember212015Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | ifrs-full_CreationDateAxis=cmcl_January112016Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CreationDateAxis=cmcl_March232016Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CreationDateAxis=cmcl_June82016Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CreationDateAxis=cmcl_January192017Member
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: |