XML 116 R93.htm IDEA: XBRL DOCUMENT
v3.21.1

Note 12 - Leases (Details Textual) | 12 Months Ended
--- | ---
Dec. 31, 2020
Statement Line Items [Line Items] |
Number of leases | 2
Bottom of range [member] |
Statement Line Items [Line Items] |
Leases, term (Year) | 3 years
Top of range [member] |
Statement Line Items [Line Items] |
Leases, term (Year) | 6 years

X
- Definition The term of leases. + References No definition available. + Details
Name: | cmcl_LeasesTerm
Namespace Prefix: | cmcl_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of leases held. + References No definition available. + Details
Name: | cmcl_NumberOfLeases
Namespace Prefix: | cmcl_
Data Type: | xbrli:integerItemType
Balance Type: | na
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
- 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: |