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Note 18 - Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2019
Statement Line Items [Line Items]  
Disclosure of detailed information about property, plant and equipment [text block]
    Land and buildings     Mine development, infrastructure and other     Exploration and Evaluation assets     Plant and equipment     Fixtures and fittings     Motor vehicles     Total  
Cost                                          
Balance at January 1, 2018    
9,434
      
61,498
      
6,967
      
27,881
      
943
      
2,329
      
109,052
  
Additions
**
    
-
      
18,719
      
-
      
899
      
202
      
95
      
19,915
  
Impairments
***
    
-
      
(60
 )    
-
      
(529
 )    
(216
 )    
(17
 )    
(822
 )
Assets held for sale    
(140
 )    
(74
 )    
-
      
-
      
-
      
-
      
(214
 )
Reallocations between asset classes    
1,068
      
(5,525
 )    
-
      
4,457
      
-
      
-
      
-
  
Foreign exchange movement    
(23
 )    
(49
 )    
-
      
(33
 )    
(6
 )    
(5
 )    
(116
 )
Balance at December 31, 2018    
10,339
      
74,509
      
6,967
      
32,675
      
923
      
2,402
      
127,815
  
                                                         
Balance at January 1, 2019    
10,339
      
74,509
      
6,967
      
32,675
      
923
      
2,402
      
127,815
  
Initial recognition of right of use assets    
409
      
-
      
-
      
-
      
-
      
-
      
409
  
Additions
**
    
267
      
19,020
      
172
      
897
      
88
      
151
      
20,595
  
Impairments
***
    
-
      
-
      
-
      
(144
 )    
-
      
 
      
(144
 )
Disposals    
(212
 )    
-
      
-
      
-
      
-
      
(16
 )    
(228
 )
Reallocations between asset classes    
25
      
(2,989
 )    
-
      
2,964
      
-
      
-
      
-
  
Foreign exchange movement    
5
      
2
      
-
      
3
      
7
      
1
      
18
  
Balance at December 31, 2019    
10,833
      
90,542
      
7,139
      
36,395
      
1,018
      
2,538
      
148,465
  
    Land and buildings     Mine development, infrastructure and other     Exploration and Evaluation assets     Plant and equipment     Fixtures and fittings     Motor vehicles     Total  
Accumulated depreciation and Impairment losses                                                        
Balance at January 1, 2018    
3,636
      
5,172
      
-
      
15,382
      
761
      
2,023
      
26,974
  
Depreciation for the year    
775
      
649
      
-
      
2,404
      
99
      
144
      
4,071
  
Impairments    
-
      
-
      
-
      
(429
 )    
(170
 )    
(15
 )    
(614
 )
Foreign exchange movement    
-
      
-
      
-
      
-
      
(41
 )    
(2
 )    
(43
 )
Balance at December 31, 2018    
4,411
      
5,821
      
-
      
17,357
      
649
      
2,150
      
30,388
  
                                                         
Balance at January 1, 2019    
4,411
      
5,821
      
-
      
17,357
      
649
      
2,150
      
30,388
  
Initial recognition of right of use assets    
146
      
-
      
-
      
-
      
-
      
-
      
146
  
Depreciation for the year    
1,005
      
504
      
-
      
2,693
      
99
      
133
      
4,434
  
Impairments    
-
      
-
      
-
      
-
      
-
      
-
      
-
  
Disposals    
(149
 )    
-
      
-
      
-
      
-
      
(16
 )    
(165
 )
Foreign exchange movement    
-
      
-
      
-
      
-
      
5
      
6
      
11
  
Balance at December 31, 2019    
5,413
      
6,325
      
-
      
20,050
      
753
      
2,273
      
34,814
  
                                                         
Carrying amounts                                                        
At December 31, 2018    
5,928
      
68,688
      
6,967
      
15,318
      
274
      
252
      
97,427
  
At December 31, 2019    
5,420
      
84,217
      
7,139
      
16,345
      
265
      
265
      
113,651