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Costs - Additional information (Details) € / shares in Units, € in Thousands, shares in Millions | 12 Months Ended |  |
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Dec. 31, 2021 EUR (€) EquityInstruments item € / shares | Dec. 31, 2020 EUR (€) EquityInstruments € / shares | Dec. 31, 2019 EUR (€) € / shares | May 13, 2020 item shares | Apr. 13, 2017 shares
Costs |  |  |  |  |
Geological and geophysical costs of exploration activities | € 194,000 | € 196,000 | € 275,000 |  |
Research and development costs | 177,000 | 157,000 | 194,000 |  |
Royalty expense | 946,000 | 673,000 | 1,183,000 |  |
Net additions for contingencies | 707,000 | 349,000 | 858,000 |  |
Provisions for redundancy incentives expense | 94,000 | 105,000 | 45,000 |  |
Defined contribution plans expense | € 97,000 | € 96,000 | € 99,000 |  |
Number of annual awards | item | 3 |  |  |  |
Vesting period | 3 years |  |  |  |
Lock-up clause percentage | 50.00% |  |  |  |
Lock-up clause term | 1 year |  |  |  |
Number of other equity instruments granted in share-based payment arrangement | 2,365,581 | 2,922,749 | 1,759,273 |  |
Weighted average fair value of awarded shares | € / shares | € 8.15 | € 4.67 | € 9.88 |  |
Weighted average share price at grant date | € / shares |  |  | € 13.714 |  |
Expected dividend as percentage |  |  | 6.10% |  |
Expected volatility |  |  | 19.00% |  |
Expense from share-based payment transactions with employees | € 16,000 | € 7,000 | € 9,000 |  |
Directors' remuneration expense | 10,130 | 7,540 | 9,200 |  |
Statutory auditors remuneration expense | € 550 | € 571 | 613 |  |
Minimum |  |  |  |  |
Costs |  |  |  |  |
Percentage of shares that will vest after vesting period | 0.00% |  |  |  |
Weighted average share price at grant date | € / shares | € 11.642 | € 5.885 |  |  |
Expected dividend as percentage | 7.10% | 7.10% |  |  |
Expected volatility | 44.00% | 41.00% |  |  |
Maximum |  |  |  |  |
Costs |  |  |  |  |
Percentage of shares that will vest after vesting period | 180.00% |  |  |  |
Weighted average share price at grant date | € / shares | € 12.164 | € 8.303 |  |  |
Expected dividend as percentage | 7.40% | 10.00% |  |  |
Expected volatility | 45.00% | 44.00% |  |  |
Long-Term Monetary Incentive Plan 2017 - 2019 |  |  |  |  |
Costs |  |  |  |  |
Percentage of shares that will be granted depending on market condition in terms of TSR |  |  |  |  | 50.00%
Percentage of shares that will be granted depending on the growth in the Net Present Value (NPV) of proved reserves benchmarked against the Peer Group |  |  |  |  | 50.00%
Long-Term Monetary Incentive Plan 2017 - 2019 | Maximum |  |  |  |  |
Costs |  |  |  |  |
Limit of shares to be granted in share-based payment arrangement | shares |  |  |  |  | 11
Long-Term Monetary Incentive Plan 2020 - 2022 |  |  |  |  |
Costs |  |  |  |  |
Percentage of shares that will be granted depending on market condition in terms of TSR |  |  |  | 25.00% |
Percentage of shares that will be granted depending on a relative parameter represented by an industrial objective |  |  |  | 20.00% |
Percentage of shares that will be granted depending on an absolute parameter represented by an economic-financial objective |  |  |  | 20.00% |
Percentage of shares that will be granted depending on environmental sustainability and energy transition objective |  |  |  | 35.00% |
Number of absolute objectives considered for determination of shares that will be granted depending on environmental sustainability and energy transition objective | item |  |  |  | 3 |
Percentage of shares that will be granted depending on decarbonisation objective |  |  |  | 15.00% |
Percentage of shares that will be granted depending on energy transition objective |  |  |  | 10.00% |
Percentage of shares that will be granted depending on circular economy objective |  |  |  | 10.00% |
Number of important projects considered for determination of shares that will be granted depending on environmental sustainability and energy transition objective |  |  |  | 3 |
Long-Term Monetary Incentive Plan 2020 - 2022 | Maximum |  |  |  |  |
Costs |  |  |  |  |
Limit of shares to be granted in share-based payment arrangement | shares |  |  |  | 20 |
Environmental liabilities |  |  |  |  |
Costs |  |  |  |  |
Net additions for contingencies | € 279,000 | € (15,000) | 329,000 |  |
Provisions for litigations |  |  |  |  |
Costs |  |  |  |  |
Net additions for contingencies | € 162,000 | € 76,000 | € 60,000 |  |

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