| Non-current assets | — | — |
| Property, plant and equipment | 1,570.81a | 1,523.8a |
| Investments in associates and joint ventures | 289.97a | 280.87a |
| Equity investments measured at fair value through other comprehensive income | 0.7a | 0.83a |
| Right-of-use assets | 192.01a | 196.61a |
| Intangible assets and other non-current assets | 76.69a | 71.71a |
| Deferred tax assets | 26.77a | 18.13a |
| Time deposits with maturities over one year | 4.96a | 3.93a |
| Total non-current assets | 2,161.91a | 2,095.88a |
| Current assets | — | — |
| Inventories | 168.34a | 180.64a |
| Accounts receivable | 71.61a | 69.01a |
| Derivative financial assets | 9.02a | 16.94a |
| Prepayments and other current assets | 114.29a | 111.03a |
| Financial assets at fair value through other comprehensive income | 8.87a | 10.66a |
| Financial assets at fair value through profit or loss | 2.82a | 7.4a |
| Time deposits with maturities over three months and within one year | 43.43a | 18.42a |
| Cash and cash equivalents | 172.48a | 249a |
| Total current assets | 590.84a | 663.1a |
| Current liabilities | — | — |
| Accounts payable and accrued liabilities | 338.51a | 363.65a |
| Contract liabilities | 80.27a | 83.94a |
| Income taxes payable | 6.85a | 11.17a |
| Other taxes payable | 53.4a | 62.82a |
| Short-term borrowings | 138.78a | 148.78a |
| Derivative financial liabilities | 7.05a | 10.73a |
| Lease liabilities | 8.65a | 7.78a |
| Financial liabilities at fair value through profit or loss | 3.81a | 1.73a |
| Total current liabilities | 637.32a | 690.6a |
| Net current liabilities | 46.47a | 27.5a |
| Total assets less current liabilities | 2,115.43a | 2,068.38a |
| Equity | — | — |
| Equity attributable to owners of the parent | — | — |
| Share capital | 183.02a | 183.02a |
| Retained earnings | 987.27a | 919.7a |
| Reserves | 344.84a | 348.37a |
| Total equity attributable to owners of the parent | 1,515.13a | 1,451.09a |
| Non-controlling interests | 194.49a | 184.21a |
| Total equity | 1,709.62a | 1,635.3a |
| Non-current liabilities | — | — |
| Long-term borrowings | 98.07a | 143.2a |
| Asset retirement obligations | 162.02a | 144.3a |
| Lease liabilities | 109.97a | 113.44a |
| Deferred tax liabilities | 25.67a | 23.13a |
| Other long-term liabilities | 10.08a | 9.02a |
| Total non-current liabilities | 405.81a | 433.08a |
| Total equity and non-current liabilities | 2,115.43a | 2,068.38a |
| Liabilities and shareholders' equity | — | — |
| Current liabilities | — | — |
| Short-term borrowings | 45.96a | 38.98a |
| Trading financial liabilities | 3.81a | 1.73a |
| Derivative financial liabilities | 7.05a | 10.73a |
| Notes payable | 14.9a | 20.73a |
| Accounts payable | 272.79a | 289.93a |
| Contract liabilities | 80.27a | 83.94a |
| Employee benefits payable | 8.1a | 8.59a |
| Taxes payable | 60.25a | 73.99a |
| Other payables | 24.2a | 28.59a |
| Current portion of non-current liabilities | 101.76a | 117.82a |
| Other current liabilities | 18.26a | 15.57a |
| Total current liabilities | 637.32a | 690.6a |
| Non-current liabilities | — | — |
| Long-term borrowings | 74.07a | 126.17a |
| Bonds payable | 24a | 17.03a |
| Lease liabilities | 109.97a | 113.44a |
| Provisions | 162.02a | 144.3a |
| Deferred tax liabilities | 25.69a | 23.14a |
| Other non-current liabilities | 10.08a | 9.02a |
| Total non-current liabilities | 405.83a | 433.1a |
| Total liabilities | 1,043.14a | 1,123.69a |
| Shareholders' equity | — | — |
| Share capital | 183.02a | 183.02a |
| Capital reserve | 121.81a | 127.68a |
| Special reserve | 6.75a | 6.89a |
| Other comprehensive income | -30.75a | -18.72a |
| Surplus reserve | 252.31a | 237.8a |
| Undistributed profits | 982.23a | 914.67a |
| Total equity attributable to owners of the parent | 1,515.37a | 1,451.33a |
| Non-controlling interests | 194.49a | 184.21a |
| Total equity | 1,709.86a | 1,635.54a |
| Total liabilities and shareholders' equity | 2,753.01a | 2,759.24a |