| In millions, except per share items | Dec-31-17 | Dec-31-16 | Dec-31-15 |
| | Source | Source | Source |
| Revenue | | | |
| Metal sales | | | |
| Cost of sales | | | |
| Production cost of sales | 1,757.4 | 1,983.8 | |
| |
| Depreciation, depletion and amortization | | | |
| |
| Total cost of sales | | | |
| Gross profit | | | |
| Other operating expense | | | |
| Exploration and business development | 106.0 | 94.3 | |
| |
| General and administrative | | | |
| Operating earnings | | | |
| Other income - net | | | |
| Finance income | | | |
| Finance expense | | | |
| Earnings from continuing operations before tax | | | |
| Income tax expense - net | | | |
| Earnings (loss) from continuing operations after tax | | | |
| (Loss) earnings from discontinued operations after tax | | | |
| Net (loss) earnings | | | |
| Net earnings (loss) from continuing operations attributable to: | | | |
| Non-controlling interests | | | |
| Common shareholders | | | |
| Net (loss) earnings from discontinued operations attributable to: | | | |
| Non-controlling interests | | | |
| Common shareholders | | | |
| Net (loss) earnings attributable to: | | | |
| Non-controlling interests | | | |
| Common shareholders | | | |
| Earnings (loss) per share from continuing operations attributable to common shareholders | | | |
| Basic | | | |
| Diluted | | | |
| (Loss) earnings per share from discontinued operations attributable to common shareholders | | | |
| Basic | | | |
| Diluted | | | |
| (Loss) earnings per share attributable to common shareholders | | | |
| Basic | | | |
| Diluted | | | |