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Costs - Additional information (Details) € / shares in Units, € in Thousands, shares in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Aug. 13, 2017 | Dec. 31, 2019 EUR (€) EquityInstruments € / shares | Dec. 31, 2018 EUR (€) EquityInstruments € / shares | Dec. 31, 2017 EUR (€) EquityInstruments € / shares | Apr. 13, 2017 item shares
Costs |  |  |  |  |
Geological and geophysical costs of exploration activities |  | € 275,000 | € 287,000 | € 273,000 |
Minimum operating lease payments recognised as expense |  |  | 872,000 | 1,022,000 |
Research and development costs |  | 194,000 | 197,000 | 185,000 |
Royalty expense |  | 1,183,000 | 1,043,000 | 674,000 |
Net provisions for contingencies |  | 858,000 | 1,120,000 | 886,000 |
Provisions for redundancy incentives expense |  | 45,000 | 37,000 | 18,000 |
Defined contribution plans expense |  | 99,000 | 95,000 | 90,000 |
Directors' remuneration expense |  | 9,200 | 9,600 | 14,500 |
Statutory auditors remuneration expense |  | € 613 | € 604 | € 760 |
Long-Term Monetary Incentive Plan 2017 - 2019 |  |  |  |  |
Costs |  |  |  |  |
Number of annual awards | item |  |  |  |  | 3
Vesting period | 3 years |  |  |  |
Number of performance parameters | item |  |  |  |  | 2
Lock-up clause percentage |  |  |  |  | 50.00%
Lock-up clause term | 1 year |  |  |  |
Number of other equity instruments granted in share-based payment arrangement | EquityInstruments |  | 1,759,273 | 1,517,975 | 1,719,061 |
Weighted average fair value of awarded shares | € / shares |  | € 9.88 | € 11.73 | € 7.99 |
Weighted average share price at grant date | € / shares |  | € 13.714 | € 14.246 | € 13.81 |
Expected dividend as percentage |  | 6.10% | 5.80% | 5.80% |
Expected volatility |  | 19.00% | 20.00% | 25.00% |
Expense from share-based payment transactions with employees |  | € 9,000 | € 5,000 | € 400 |
Long-Term Monetary Incentive Plan 2017 - 2019 | Minimum |  |  |  |  |
Costs |  |  |  |  |
Percentage of shares that will vest after vesting period |  |  |  |  | 0.00%
Long-Term Monetary Incentive Plan 2017 - 2019 | Maximum |  |  |  |  |
Costs |  |  |  |  |
Limit of shares to be granted in share-based payment arrangement | shares |  |  |  |  | 11
Percentage of shares that will vest after vesting period |  |  |  |  | 180.00%
Provisions for litigations |  |  |  |  |
Costs |  |  |  |  |
Net provisions for contingencies |  | 60,000 | 101,000 | 375,000 |
Environmental liabilities |  |  |  |  |
Costs |  |  |  |  |
Net provisions for contingencies |  | € 329,000 | € 266,000 | € 200,000 |

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- Definition Disclosure Of Operating Expenses. + References No definition available. + Details
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- Definition Limit of shares to be granted in share-based payment arrangement + References No definition available. + Details
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- Definition Lock-up clause percentage + References No definition available. + Details
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- Definition The amount of minimum operating lease payment. + References No definition available. + Details
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- Definition The expected volatility of the share price used to calculate the fair value of the share options granted. Expected volatility is a measure of the amount by which a price is expected to fluctuate during a period. The measure of volatility used in option pricing models is the annualised standard deviation of the continuously compounded rates of return on the share over a period of time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2019-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The percentage of an expected dividend used to calculate the fair value of share options granted. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2019-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The number of other equity instruments (ie other than share options) granted in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2019-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_47_b&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2019-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of post-employment benefit expense relating to defined contribution plans. Defined contribution plans are post-employment benefit plans under which an entity pays fixed contributions into a separate entity (a fund) and will have no legal or constructive obligation to pay further contributions if the fund does not hold sufficient assets to pay all employee benefits relating to employee service in the current and prior periods. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 53 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_53&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of expense in relation to termination benefits. Termination benefits are employee benefits provided in exchange for the termination of an employee's employment as a result of either: (a) an entity's decision to terminate an employee's employment before the normal retirement date; or (b) an employee's decision to accept an offer of benefits in exchange for the termination of employment. [Refer: Employee benefits expense] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2019-01-01 -Paragraph 171 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2019-en-r&anchor=para_171&doctype=Standard -URIDate 2019-03-27 + Details
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