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Note 19 - Exploration and Evaluation Assets - Exploration and Evaluation Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Statement Line Items [Line Items]    
Balance at beginning of period $ 6,768 $ 7,139
- Option payments   2,800
- Consumables and drilling 1,218 189
- Labour 208 46
- Power 39 24
Reallocate to assets held for sale * [1]   (500)
Impairment * (3,837) [2] (2,930) [1]
- Mining claims acquired 4,000  
Decommissioning asset acquired 135  
- Contractor 117  
Balance 8,648 6,768
Glen Hume [Member]    
Statement Line Items [Line Items]    
Balance at beginning of period 2,661 0
- Option payments   2,500
- Consumables and drilling 1,074 161
- Labour 60 0
- Power 0 0
Reallocate to assets held for sale * [1]   0
Impairment * (3,837) [2] 0 [1]
- Mining claims acquired 0  
Decommissioning asset acquired 0  
- Contractor 42  
Balance 0 2,661
Connemara North [Member]    
Statement Line Items [Line Items]    
Balance at beginning of period 300 0
- Option payments   300
- Consumables and drilling 71 0
- Labour 41 0
- Power 0 0
Reallocate to assets held for sale * [1]   0
Impairment * 0 [2] 0 [1]
- Mining claims acquired 0  
Decommissioning asset acquired 0  
- Contractor 51  
Balance 463 300
Maligreen [member]    
Statement Line Items [Line Items]    
Balance at beginning of period 0 0
- Option payments   0
- Consumables and drilling 14 0
- Labour 47 0
- Power 0 0
Reallocate to assets held for sale * [1]   0
Impairment * 0 [2] 0 [1]
- Mining claims acquired 4,000  
Decommissioning asset acquired 135  
- Contractor 0  
Balance 4,196 0
GG [member]    
Statement Line Items [Line Items]    
Balance at beginning of period 3,523 3,441
- Option payments   0
- Consumables and drilling 16 28
- Labour 46 35
- Power 33 19
Reallocate to assets held for sale * [1]   0
Impairment * 0 [2] 0 [1]
- Mining claims acquired 0  
Decommissioning asset acquired 0  
- Contractor 0  
Balance 3,618 3,523
Eagle Vulture, Mascot and Penzance [member]    
Statement Line Items [Line Items]    
Balance at beginning of period 0 3,416
- Option payments   0
- Consumables and drilling 0 0
- Labour 0 11
- Power 0 3
Reallocate to assets held for sale * [1]   (500)
Impairment * 0 [2] (2,930) [1]
- Mining claims acquired 0  
Decommissioning asset acquired 0  
- Contractor 0  
Balance 0 0
Sabiwa [member]    
Statement Line Items [Line Items]    
Balance at beginning of period 284 282
- Option payments   0
- Consumables and drilling 0 0
- Labour 0 0
- Power 6 2
Reallocate to assets held for sale * [1]   0
Impairment * 0 [2] 0 [1]
- Mining claims acquired 0  
Decommissioning asset acquired 0  
- Contractor 0  
Balance 290 284
Abercorn [member]    
Statement Line Items [Line Items]    
Balance at beginning of period 0 0
- Option payments   0
- Consumables and drilling 12 0
- Labour 4 0
- Power 0 0
Reallocate to assets held for sale * [1]   0
Impairment * 0 [2] 0 [1]
- Mining claims acquired 0  
Decommissioning asset acquired 0  
- Contractor 0  
Balance 16 0
Valentine [member]    
Statement Line Items [Line Items]    
Balance at beginning of period 0 0
- Option payments   0
- Consumables and drilling 31 0
- Labour 10 0
- Power 0 0
Reallocate to assets held for sale * [1]   0
Impairment * 0 [2] 0 [1]
- Mining claims acquired 0  
Decommissioning asset acquired 0  
- Contractor 24  
Balance $ 65 $ 0
[1] Management determined the fair value of Eagle Vulture, Mascot and Penzance as the future sale price as agreed by independent parties in the sale contract that amounted to $500. The carrying amount of Eagle Vulture, Mascot and Penzance before the impairment was $3,430 and the write down resulted in an impairment expense of $2,930. The $500 carrying value was reallocated to Assets held for sale in December, 2020. The sale was completed on July 27, 2021.
[2] Caledonia has completed sufficient work to establish that the potential orebody at the Glen Hume property will not meet Caledonia’s requirements in terms of size, grade and width. Accordingly, Caledonia will not exercise the option to acquire this property. The Group voluntarily changed its disclosure policy for exploration and evaluation assets to be disclosed separately as Exploration and evaluation assets rather than as part of Property, plant and equipment (refer to note 4(h)).