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Note 12 - Share-based Payments (Tables) | 12 Months Ended
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Dec. 31, 2022
Statement Line Items [Line Items] |
Explanation of effect of share-based payments on entity's profit or loss [text block] |
| Note |  | 2022 |  |  | 2021 |  |  | 2020 |
Restricted Share Units and cash-settled Performance Units | 12.1(a) |  |  | 609 |  |  |  | 515 |  |  |  | 1,299 |
Caledonia Mining South Africa employee incentive scheme |  |  | – |  |  |  | (38 | ) |  |  | 114 |
|  |  |  | 609 |  |  |  | 477 |  |  |  | 1,413 |
| Note |  | 2022 |  |  | 2021 |  |  | 2020 |
EPUs | 12.2(a) |  |  | 417 |  |  |  | – |  |  |  | – |
Share option programs | 12.2(b) |  |  | 67 |  |  |  | – |  |  |  | – |
|  |  |  | 484 |  |  |  | – |  |  |  | – |
Disclosure of indirect measurement of fair value of goods or services received, share options granted during period [text block] |
|  | 2022 |  |  | 2021 |
|  | RSUs |  |  | PUs |  |  | RSUs |  |  | PUs |
Risk free rate |  |  | 3.88 | % |  |  | 3.88 | % |  |  | 1.52 | % |  |  | 1.52 | %
Fair value (USD) |  |  | 12.52 |  |  |  | 12.42 |  |  |  | 12.06 |  |  |  | 11.63 |
Share price (USD) |  |  | 12.40 |  |  |  | 12.42 |  |  |  | 11.71 |  |  |  | 11.71 |
Performance multiplier percentage |  |  | – |  |  |  | 93-100 | % |  |  | – |  |  |  | 93-100 | %
Volatility |  |  | 1.29 |  |  |  | 0.91 |  |  |  | 1.20 |  |  |  | 1.06 |
Share units granted: |  | RSUs |  |  | PUs |  |  | RSUs |  |  | PUs |
Grant - January 11, 2019 |  |  | – |  |  |  | 95,740 |  |  |  | – |  |  |  | 95,740 |
Grant - March 23, 2019 |  |  | – |  |  |  | 28,287 |  |  |  | – |  |  |  | 28,287 |
Grant - June 8, 2019 |  |  | – |  |  |  | 14,672 |  |  |  | – |  |  |  | 14,672 |
Grant - January 11, 2020 |  |  | 17,585 |  |  |  | 114,668 |  |  |  | 17,585 |  |  |  | 114,668 |
Grant - March 31, 2020 |  |  | – |  |  |  | 1,971 |  |  |  | – |  |  |  | 1,971 |
Grant - June 1, 2020 |  |  | – |  |  |  | 1,740 |  |  |  | – |  |  |  | 1,740 |
Grant - September 9, 2020 |  |  | – |  |  |  | 1,611 |  |  |  | – |  |  |  | 1,611 |
Grant - September 14, 2020 |  |  | – |  |  |  | 20,686 |  |  |  | – |  |  |  | 20,686 |
Grant - October 5, 2020 |  |  | – |  |  |  | 514 |  |  |  | – |  |  |  | 514 |
Grant - January 11, 2021 |  |  | – |  |  |  | 78,875 |  |  |  | – |  |  |  | 78,875 |
Grant -April 1, 2021 |  |  | – |  |  |  | 770 |  |  |  | – |  |  |  | 770 |
Grant - May 14, 2021 |  |  | – |  |  |  | 2,389 |  |  |  | – |  |  |  | 2,389 |
Grant - June 1, 2021 |  |  | – |  |  |  | 1,692 |  |  |  | – |  |  |  | 1,692 |
Grant - June 14, 2021 |  |  | – |  |  |  | 507 |  |  |  | – |  |  |  | 507 |
Grant - August 13, 2021 |  |  | – |  |  |  | 2,283 |  |  |  | – |  |  |  | 2,283 |
Grant - September 1, 2021 |  |  | – |  |  |  | 553 |  |  |  | – |  |  |  | 553 |
Grant - September 6, 2021 |  |  | – |  |  |  | 531 |  |  |  | – |  |  |  | 531 |
Grant - September 20, 2021 |  |  | – |  |  |  | 526 |  |  |  | – |  |  |  | 526 |
Grant - October 1, 2021 |  |  | – |  |  |  | 2,530 |  |  |  | – |  |  |  | 2,530 |
Grant - October 11, 2021 |  |  | – |  |  |  | 500 |  |  |  | – |  |  |  | 500 |
Grant - November 12, 2021 |  |  | – |  |  |  | 1,998 |  |  |  | – |  |  |  | 1,998 |
Grant - December 1, 2021 |  |  | – |  |  |  | 936 |  |  |  | – |  |  |  | 936 |
Grant - January 11, 2022 |  |  | – |  |  |  | 96,359 |  |  |  | – |  |  |  | – |
Grant - January 12, 2022 |  |  | – |  |  |  | 825 |  |  |  | – |  |  |  | – |
Grant - May 13, 2022 |  |  | – |  |  |  | 2,040 |  |  |  | – |  |  |  | – |
Grant - June 1, 2022 |  |  | – |  |  |  | 1,297 |  |  |  | – |  |  |  | – |
Grant - July 1, 2022 |  |  | – |  |  |  | 2,375 |  |  |  | – |  |  |  | – |
Grant - October 1, 2022 |  |  | – |  |  |  | 2,024 |  |  |  | – |  |  |  | – |
RSU dividends reinvested |  |  | 1,980 |  |  |  | – |  |  |  | 1,066 |  |  |  | – |
Settlements/terminations |  |  | – |  |  |  | (254,491 | ) |  |  | – |  |  |  | (30,600 | )
Total awards |  |  | 19,565 |  |  |  | 224,408 |  |  |  | 18,651 |  |  |  | 343,379 |
Grant date |  | January 24, 2022 |
Number of units – at granted and reporting date |  |  | 130,380 |
Share price (USD) – at grant date |  |  | 11.50 |
Fair value (USD) – at grant date |  |  | 10.15 |
Performance multiplier percentage at December 31, 2022 |  |  | 100 | %
Options granted | 10,000 |  | 10,000
Grant date | February 27, 2018 |  | September 30, 2022
Expiry date | August 25, 2024 |  | September 30, 2029
Period option may be exercised from | February 27, 2018 |  | September 30, 2025
Holding period on shares issued | None |  | First anniversary from issue date
Stock exchange | Toronto Stock Exchange |  | New York Stock Exchange
Exercise price | CAD 9.30 |  | USD 9.49
Share price at grant date | CAD 9.30 |  | USD 9.82
Risk-free interest rate | 2.86% |  | 4%
Expected stock price volatility (based on historical volatility) | 32% |  | 102%
Expected option life in years | 3 |  | 3

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