XML 106 R87.htm IDEA: XBRL DOCUMENT
v3.19.1

Note 15 - Margin Call on Gold Hedge (Details Textual) |  | 1 Months Ended | 12 Months Ended | 31 Months Ended
--- | --- | --- | --- | ---
Aug. 17, 2018 USD ($) | Feb. 29, 2016 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | [1] | Dec. 31, 2016 USD ($) | Aug. 17, 2018 USD ($)
Statement Line Items [Line Items] |  |  |  |  |  |
Hedging gains (losses) for hedge of group of items with offsetting risk positions |  |  | $ (360,000) |  | $ (435,000) |
Early settlement discount for gold price |  |  | 1.25% |  |  |
Derivative contract for 8,000 ounces of Gold [member] | Commodity price risk [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Derivative contract, number of ounces of gold hedged | 8,000 |  |  |  |  | 8,000
Hedging instruments, protected, price | $ 1,150 |  |  |  |  |
Hedging instruments, participation, price | $ 1,195 |  |  |  |  | $ 1,195
Hedging gains (losses) for hedge of group of items with offsetting risk positions |  |  | $ (360,000) |  |  |
Derivative contract for 15,000 ounces of Gold [member] | Commodity price risk [member] |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |
Derivative contract, number of ounces of gold hedged |  | 15,000 |  |  |  |
Hedging instruments, protected, price |  | $ 1,050 |  |  |  |
Hedging instruments, participation, price |  | $ 1,079 |  |  |  |
Hedging gains (losses) for hedge of group of items with offsetting risk positions |  |  |  |  | $ (435,000) |
Term of derivative contract |  | 180 days |  |  |  |
[1] | Restated, refer note 4(a).

X
- Definition The number of ounces hedged in a derivative contract. + References No definition available. + Details
Name: | cmcl_DerivativeContractNumberOfOuncesOfGoldHedged
Namespace Prefix: | cmcl_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition The discount to gold price due to the early settlement. + References No definition available. + Details
Name: | cmcl_EarlySettlementDiscountForGoldPrice
Namespace Prefix: | cmcl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The company would full participation if the market price of hedging assets rise above such price. + References No definition available. + Details
Name: | cmcl_HedgingInstrumentsParticipationPrice
Namespace Prefix: | cmcl_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition The company would be protected if the market price of hedging assets dip below such price. + References No definition available. + Details
Name: | cmcl_HedgingInstrumentsProtectedPrice
Namespace Prefix: | cmcl_
Data Type: | xbrli:monetaryItemType
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 term of a derivative contract. + References No definition available. + Details
Name: | cmcl_TermOfDerivativeContract
Namespace Prefix: | cmcl_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The hedging gains (losses) for hedge of group of items with offsetting risk positions. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 24C -Subparagraph b -Clause vi -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_24C_b_vi&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 9 -IssueDate 2017-01-01 -Paragraph 6.6.4 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=9&date=2017-03-01&anchor=para_6.6.4&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_HedgingGainsLossesForHedgeOfGroupOfItemsWithOffsettingRiskPositions
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | ifrs-full_HedgingInstrumentsAxis=cmcl_DerivativeContractFor8000OuncesOfGoldMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfRisksAxis=ifrs-full_CommodityPriceRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_HedgingInstrumentsAxis=cmcl_DerivativeContractFor15000OuncesOfGoldMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |