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Note 30 - Share-based Payments (Tables) | 12 Months Ended
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Dec. 31, 2020
Statement Line Items [Line Items] |
Explanation of effect of share-based payments on entity's profit or loss [text block] |
|  |  | Note |  |  |  | 2020 |  |  |  | 2019 |  |  |  | 2018 |
Restricted Share Units and Performance Units |  |  | 30.1 | (a) |  |  | 1,299 |  |  |  | 616 |  |  |  | 218 |
Caledonia Mining South Africa employee incentive scheme |  |  | 30.1 | (b) |  |  | 114 |  |  |  | 73 |  |  |  | 97 |
|  |  |  |  |  |  | 1,413 |  |  |  | 689 |  |  |  | 315 |
|  |  | Note |  |  |  | 2020 |  |  |  | 2019 |  |  |  | 2018 |
Share option programmes |  |  | 30.2 | (a) |  |  | – |  |  |  | – |  |  |  | 14 |
|  |  |  |  |  |  | – |  |  |  | – |  |  |  | 14 |
Disclosure of indirect measurement of fair value of goods or services received, share options granted during period [text block] |
|  | December 31, |  | December 31,
|  | 2020 |  | 2019
|  |  | RSUs |  |  |  | PUs |  |  |  | RSUs |  |  |  | PUs |
Fair value (USD) |  | $ | 15.88 |  |  | $ | 15.51 |  |  | $ | 8.46 |  |  | $ | 8.19 |
Share price (USD) |  | $ | 15.88 |  |  | $ | 15.88 |  |  | $ | 8.46 |  |  | $ | 8.46 |
Performance multiplier percentage |  |  | – |  |  |  | 93 - 100% |  |  |  | – |  |  |  | 93 - 100% |
Share units granted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  |  | RSUs |  |  |  | PUs |  |  |  | RSUs |  |  |  | PUs |
Grant – January 11, 2016 |  |  | – |  |  |  | – |  |  |  | 60,645 |  |  |  | 242,579 |
Grant- March 23, 2016 |  |  | – |  |  |  | – |  |  |  | 10,965 |  |  |  | 43,871 |
Grant – June 8, 2016 |  |  | – |  |  |  | – |  |  |  | 5,117 |  |  |  | 20,470 |
Grant - January 19, 2017 |  |  | 4,443 |  |  |  | 17,774 |  |  |  | 4,443 |  |  |  | 17,774 |
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 |  |  |  | – |  |  |  | – |
Grant - March 31, 2020 |  |  | – |  |  |  | 1,971 |  |  |  | – |  |  |  | – |
Grant - June 1, 2020 |  |  | – |  |  |  | 1,740 |  |  |  | – |  |  |  | – |
Grant - September 9, 2020 |  |  | – |  |  |  | 1,611 |  |  |  | – |  |  |  | – |
Grant - September 14, 2020 |  |  | – |  |  |  | 20,686 |  |  |  | – |  |  |  | – |
Grant - October 5, 2020 |  |  | – |  |  |  | 514 |  |  |  | – |  |  |  | – |
RSU dividends reinvested |  |  | 995 |  |  |  | – |  |  |  | 11,316 |  |  |  | – |
Settlements/ terminations |  |  | (5,052 | ) |  |  | (17,774 | ) |  |  | (87,434 | ) |  |  | (306,920 | )
Total awards |  |  | 17,971 |  |  |  | 279,889 |  |  |  | 5,052 |  |  |  | 156,473 |
Options Granted |  |  | 10,000 |
Grant date |  |  | February 27, 2018 |
Risk-free interest rate |  |  | 2.86 | %
Expected stock price volatility (based on historical volatility) |  |  | 32 | %
Expected option life in years |  |  | 3 |
Exercise price |  |  | CAD 9.30 |
Share price at grant date |  |  | CAD 9.30 |
Fair value at grant date |  | $ | 1.40 |
Disclosure of indirect measurement of fair value of goods or services received, other equity instruments granted during period [text block] |
|  |  | 2020 |  |  |  | 2019 |
|  |  | Awards |
Grant – July 2017 (3-year term) |  |  | – |  |  |  | 37,330 |
Grant – August 2018 (3-year term) |  |  | 5,918 |  |  |  | 5,918 |
Grant - August 2019 (3-year term) |  |  | 9,034 |  |  |  | 9,034 |
Awards paid out/ expired |  |  | (11,941 | ) |  |  | (44,985 | )
Total awards outstanding |  |  | 3,011 |  |  |  | 7,297 |
Estimated awards expected to vest |  |  | 100 | % |  |  | 100 | %
Disclosure of range of exercise prices of outstanding share options [text block] |
| Number of Options |  |  |  | Exercise Price |  |  | Expiry Date
|  |  |  |  | Canadian $ |  |  |
| 18,000 |  |  |  | 11.50 |  |  | Oct 13, 2021
| 10,000 |  |  |  | 9.30 |  |  | Aug 25, 2024
| 28,000 |  |  |  |  |  |  |
Disclosure of number and weighted average exercise prices of share options [text block] |
|  |  | Number of Options |  |  |  | Weighted Avg. Exercise Price |
|  |  |  |  |  |  | Canadian $ |
Options outstanding and excercisable at January 1, 2019 |  |  | 38,000 |  |  |  | 9.48 |
Granted |  |  | - |  |  |  | - |
Exercised |  |  | - |  |  |  | - |
Options outstanding and excercisable at December 31, 2019 |  |  | 38,000 |  |  |  | 9.48 |
Granted |  |  | - |  |  |  | - |
Exercised |  |  | (5,000 | ) |  |  | 8.10 |
Expired |  |  | (5,000 | ) |  |  | 4.00 |
Options outstanding and excercisable at December 31, 2020 |  |  | 28,000 |  |  |  | 10.71 |

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