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Costs - Additional information (Details) € / shares in Units, € in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
May 10, 2023 NUMBER shares | May 13, 2020 NUMBER shares | Dec. 31, 2023 EUR (€) shares NUMBER € / shares | Dec. 31, 2022 EUR (€) shares € / shares | Dec. 31, 2021 EUR (€) shares € / shares
Costs |  |  |  |  |
Prospecting costs, geological and geophysical studies of exploration activities |  |  | € 205,000 | € 220,000 | € 194,000
Research and development costs |  |  | 166,000 | 164,000 | 177,000
Royalty expense |  |  | 1,138,000 | 1,570,000 | 946,000
Net additions for contingencies |  |  | 1,369,000 | 2,985,000 | 707,000
Provisions for redundancy incentives expense |  |  | 56,000 | 78,000 | 94,000
Defined contribution plans expense |  |  | € 102,000 | € 103,000 | € 97,000
Number of annual awards | NUMBER |  |  | 3 |  |
Vesting period |  |  | 3 years |  |
Performance period |  |  | 3 years |  |
Lock-up clause percentage |  |  | 50.00% |  |
Number of other equity instruments granted in share-based payment arrangement | shares |  |  | 1,909,849 | 2,069,685 | 2,365,581
Weighted average fair value of awarded shares | € / shares |  |  | € 10.82 | € 9.2 | € 8.15
Expense from share-based payment transactions with employees |  |  | € 20,000 | € 18,000 | € 16,000
Directors' remuneration expense |  |  | 13,900 | 11,120 | 10,130
Statutory auditors remuneration expense |  |  | € 580 | € 589 | € 550
Minimum |  |  |  |  |
Costs |  |  |  |  |
Percentage of shares that will vest after vesting period |  |  | 0.00% |  |
Weighted average share price at grant date | € / shares |  |  | € 15.068 | € 12.918 | € 11.642
Expected dividend as percentage |  |  | 6.60% | 6.10% | 7.10%
Expected volatility |  |  | 28.20% | 30.00% | 44.00%
Maximum |  |  |  |  |
Costs |  |  |  |  |
Percentage of shares that will vest after vesting period |  |  | 180.00% |  |
Weighted average share price at grant date | € / shares |  |  | € 15.482 | € 14.324 | € 12.164
Expected dividend as percentage |  |  | 6.80% | 6.80% | 7.40%
Expected volatility |  |  | 28.40% | 31.00% | 45.00%
Long-Term Monetary Incentive Plan 2020 - 2022 |  |  |  |  |
Costs |  |  |  |  |
Limit of shares to be granted for the part relating to unused shares in share-based payment arrangement | shares | 6,700,000 |  |  |  |
Percentage of shares that will be granted depending on market condition in terms of TSR |  | 25.00% |  |  |
Performance period |  | 3 years |  |  |
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 | NUMBER |  | 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 | NUMBER |  | 3 |  |  |
Lock-up clause term |  | 1 year |  |  |
Period from Strategic Plan approved by the Board of Administration |  | 3 years |  |  |
Long-Term Monetary Incentive Plan 2020 - 2022 | Maximum |  |  |  |  |
Costs |  |  |  |  |
Limit of shares to be granted in share-based payment arrangement | shares |  | 20,000,000 |  |  |
Long-Term Monetary Incentive Plan 2023 - 2025 |  |  |  |  |
Costs |  |  |  |  |
Percentage of shares that will be granted depending on market condition in terms of TSR | 25.00% |  |  |  |
Performance period | 3 years |  |  |  |
Percentage of shares that will be granted depending on an absolute parameter represented by an economic-financial objective | 40.00% |  |  |  |
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 | NUMBER | 3 |  |  |  |
Percentage of shares that will be granted depending on decarbonisation objective | 10.00% |  |  |  |
Percentage of shares that will be granted depending on energy transition objective | 15.00% |  |  |  |
Percentage of shares that will be granted depending on circular economy objective | 10.00% |  |  |  |
Lock-up clause term | 2 years |  |  |  |
Long-Term Monetary Incentive Plan 2023 - 2025 | Maximum |  |  |  |  |
Costs |  |  |  |  |
Limit of shares to be granted in share-based payment arrangement | shares | 16,000,000 |  |  |  |
Environmental liabilities |  |  |  |  |
Costs |  |  |  |  |
Net additions for contingencies |  |  | € 559,000 | € 1,700,000 | € 279,000
Provisions for litigations |  |  |  |  |
Costs |  |  |  |  |
Net additions for contingencies |  |  | € 87,000 | € 501,000 | € 162,000

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