| Reconciliation of site restoration provision | 2017 | 2016 | ||||||
| Balance at January 1 | 3,456 | 2,762 | ||||||
| Foreign exchange movement | 62 | 80 | ||||||
| Unwinding of discount | 25 | 25 | ||||||
| Rehabilitation performed | (22 | ) | - | |||||
| Change in estimate during the year | ||||||||
| - adjusted through profit or loss | 58 | 32 | ||||||
| - adjustment capitalised in Property, plant and equipment | 218 | 557 | ||||||
| Balance at December 31 | 3,797 | 3,456 | ||||||