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Business transactions (Narrative) (Details) |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Nov. 03, 2021 USD ($) | Jan. 16, 2020 USD ($) item | Dec. 31, 2021 USD ($) item | Dec. 31, 2020 USD ($) | Aug. 31, 2021 | Nov. 22, 2020 USD ($) | Jul. 31, 2020 USD ($)
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |
Revenue |  |  |  | $ 42,855,000 |  |  |
Net loss |  |  |  | 5,523,000 |  |  |
Percentage of voting equity interests acquired |  | 100.00% | 100.00% |  |  |  |
Reversal of impairment loss |  |  | $ 13,307,000 |  |  |  |
Number of Exploratory Wells | item |  |  | 3 |  |  |  |
Capital commitments |  |  | $ 20,172,000 |  |  |  |
Amerisur Resources Limited [Member] |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |
Consideration transferred, acquisition-date fair value |  |  | 314,163,000 |  |  |  |
Cash transferred |  |  | 314,163,000 |  |  |  |
Manati Block [Member] |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |
Percent of Ownership Interest Sold |  |  |  |  |  | 10.00% |
Total Consideration Receivable |  |  |  | 27,787,000 |  | $ 144,400,000 |
Fixed Consideration Receivable |  |  |  |  |  | 124,400,000 |
Earn Out Consideration Receivable |  |  |  |  |  | $ 20,000,000 |
Morona Block [Member] |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |
Impairment loss recognised in profit or loss, property, plant and equipment |  |  |  | 33,976,000 |  |  |
Write Down of Value Added Tax Credit |  |  |  | 6,017,000 |  |  |
Deferred tax expense arising from write-down or reversal of write-down of deferred tax asset |  |  |  | 8,353,000 |  |  |
Provision for Environmental Obligations |  |  |  | $ 1,886,000 |  |  |
REC-T-128 [Member] |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |
Percent of Ownership Interest Sold |  |  |  |  |  |  | 70.00%
Total Consideration Receivable |  |  |  |  |  |  | $ 1,100,000
Fixed Consideration Receivable |  |  |  |  |  |  | $ 710,000
Aguada Baguales El Porvenir And Puesto Touquet Blocks [Member] |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |
Total Consideration Receivable | $ 16,000,000 |  |  |  |  |  |
Proceeds from disposal of non-current assets or disposal groups classified as held for sale and discontinued operations | $ 1,600,000 |  |  |  |  |  |
Acquisition [member] | Amerisur Resources Limited [Member] |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |
Cash transferred |  | $ 314,163,077 |  |  |  |  |
Acquisition [member] | Amerisur Resources Limited [Member] | Colombia [Member] |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |
Number of Exploration Blocks | item |  | 13 |  |  |  |  |
Acquisition [member] | Putumayo Basin Block [Member] | Amerisur Resources Limited [Member] |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |
Number of Exploration Blocks | item |  | 12 |  |  |  |  |
Acquisition [member] | Llanos Basin [Member] | Amerisur Resources Limited [Member] |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |
Number of Exploration Blocks | item |  | 1 |  |  |  |  |
Aguada Baguales El Porvenir And Puesto Touquet Blocks [Member] |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  |  |  |  | 100.00% |  |
Impairment loss recognised in profit or loss, property, plant and equipment |  |  | $ 0 |  |  |  |

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