| Goodwill | Mineral licenses | Other intangible assets |
||||||||||
|
Cost |
||||||||||||
|
At December 31, 2014 |
32,958 | 55,712 | — | |||||||||
|
|
|
|
|
|
|
|||||||
|
Additions |
— | 71 | — | |||||||||
|
Disposal |
(88 | ) | — | — | ||||||||
|
Exchange differences |
125 | — | — | |||||||||
|
|
|
|
|
|
|
|||||||
|
At December 31, 2015 |
32,995 | 55,783 | — | |||||||||
|
|
|
|
|
|
|
|||||||
|
Additions |
— | — | — | |||||||||
|
Disposal |
— | — | — | |||||||||
|
Exchange differences |
(93 | ) | — | — | ||||||||
|
|
|
|
|
|
|
|||||||
|
At December 31, 2016 |
32,902 | 55,783 | — | |||||||||
|
|
|
|
|
|
|
|||||||
|
Additions |
0 | 0 | 880 | |||||||||
|
Disposal |
0 | (165 | ) | 0 | ||||||||
|
Exchange differences |
(24 | ) | 0 | 0 | ||||||||
|
|
|
|
|
|
|
|||||||
|
At December 31, 2017 |
32,878 | 55,618 | 880 | |||||||||
|
|
|
|
|
|
|
|||||||
|
Depletion, amortisation and impairment |
||||||||||||
|
At December 31, 2014 |
(10,261 | ) | (15,590 | ) | — | |||||||
|
|
|
|
|
|
|
|||||||
|
Impairment |
(1,444 | ) | — | — | ||||||||
|
Depletion and amortisation |
— | (1,676 | ) | — | ||||||||
|
Disposal |
88 | — | — | |||||||||
|
Exchange differences |
— | — | — | |||||||||
|
|
|
|
|
|
|
|||||||
|
At December 31, 2015 |
(11,617 | ) | (17,266 | ) | — | |||||||
|
|
|
|
|
|
|
|||||||
|
Impairment |
(2,930 | ) | (572 | ) | — | |||||||
|
Depletion and amortisation |
— | (1,846 | ) | — | ||||||||
|
Disposal |
— | — | — | |||||||||
|
Exchange differences |
— | — | ||||||||||
|
|
|
|
|
|
|
|||||||
|
At December 31, 2016 |
(14,547 | ) | (19,684 | ) | — | |||||||
|
|
|
|
|
|
|
|||||||
|
Impairment |
0 | (1,190 | ) | 0 | ||||||||
|
Depletion and amortisation |
0 | (1,504 | ) | 0 | ||||||||
|
Disposal |
0 | 0 | 0 | |||||||||
|
Exchange differences |
0 | 0 | 0 | |||||||||
|
|
|
|
|
|
|
|||||||
|
At December 31, 2017 |
(14,547 | ) | (22,378 | ) | 0 | |||||||
|
|
|
|
|
|
|
|||||||
|
Net book value |
||||||||||||
|
At December 31, 2014 |
22,697 | 40,122 | — | |||||||||
|
|
|
|
|
|
|
|||||||
|
At December 31, 2015 |
21,378 | 38,517 | — | |||||||||
|
|
|
|
|
|
|
|||||||
|
At December 31, 2016 |
18,355 | 36,099 | — | |||||||||
|
|
|
|
|
|
|
|||||||
|
At December 31, 2017 |
18,331 | 33,240 | 880 | |||||||||
|
|
|
|
|
|
|
|||||||