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Financial instruments by category (Tables) | 12 Months Ended
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Dec. 31, 2022
Disclosure of detailed information about financial instruments [line items] |
Schedule of Financial Instruments by Category | ​
​ | ​ | ​ | ​ | ​
​ | ​ | Assets as per statement
​ | ​ | of financial position
Amounts in US$ '000 | ​ | 2022 | ​ | 2021
Financial assets at fair value through profit or loss | ​ | ​ | ​ | ​
Derivative financial instrument assets | ​ | 967 | ​ | 126
Cash and cash equivalents | ​ | 242 | ​ | 427
​ | ​ | 1,209 | ​ | 553
Other financial assets at amortized cost | ​ |  | ​ |
Trade receivables | ​ | 71,794 | ​ | 70,531
To be recovered from co-venturers (Note 34) | ​ | 8,750 | ​ | 4,680
Other financial assets (a) | ​ | 12,877 | ​ | 14,747
Cash and cash equivalents | ​ | 128,601 | ​ | 100,177
​ | ​ | 222,022 | ​ | 190,135
Total financial assets | ​ | 223,231 | ​ | 190,688
(a) | Non-current other financial assets relate to restricted deposits made for environmental obligations according to Brazilian government regulations. Current other financial assets correspond to short-term investments with original maturities up to twelve months and over three months.
​
​ | ​ | ​ | ​ | ​
​ | ​ | Liabilities as per statement
​ | ​ | of financial position
Amounts in US$ ‘000 | ​ | 2022 | ​ | 2021
Liabilities at fair value through profit and loss | ​ |  | ​ |
Derivative financial instrument liabilities | ​ | 19 | ​ | 20,757
​ | ​ | 19 | ​ | 20,757
Other financial liabilities at amortized cost | ​ |  | ​ |
Trade payables | ​ | 102,125 | ​ | 86,672
To be paid to co-venturers (Note 34) | ​ | 2,815 | ​ | 953
Lease liabilities | ​ | 32,051 | ​ | 20,744
Borrowings | ​ | 497,642 | ​ | 674,092
​ | ​ | 634,633 | ​ | 782,461
Total financial liabilities | ​ | 634,652 | ​ | 803,218
​
Schedule of Credit Quality of Financial Assets | The credit quality of financial assets that are neither past due nor impaired can be assessed by reference to external credit ratings (if available) or to historical information about counterparty default rates: ​
​ | ​ | ​ | ​ | ​
Amounts in US$ ‘000 | ​ | 2022 | ​ | 2021
Trade receivables | ​ |  | ​ |
Counterparties with an external credit rating (Moody’s, S&P, Fitch) | ​ |  | ​ |
Aa2 | ​ | — | ​ | 7,132
Aa3 | ​ | 2,013 | ​ | —
A3 | ​ | 1,557 | ​ | —
Baa1 | ​ | 99 | ​ | —
Baa3 | ​ | 198 | ​ | 24,163
Ba1 | ​ | 23,755 | ​ | 4,984
Ba3 | ​ | 2,745 | ​ | —
B2 | ​ | 4,085 | ​ | 70
Counterparties without an external credit rating | ​ | ​ | ​ | ​
Group 1 (a) | ​ | 37,342 | ​ | 34,182
Total trade receivables | ​ | 71,794 | ​ | 70,531
(a) | Group 1 – existing customers (more than 6 months) with no defaults in the past.
Schedule of Financial Liabilities - contractual undiscounted cash flows | The table below analyses the Group’s financial liabilities into relevant maturity groupings based on the remaining period at the balance sheet to the contractual maturity date. The amounts disclosed in the table are the contractual undiscounted cash flows. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Less than 1 | ​ | Between 1 | ​ | Between 2 | ​ | Over 5
Amounts in US$ ‘000 | ​ | year | ​ | and 2 years | ​ | and 5 years | ​ | years
As of December 31, 2022 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Borrowings | ​ | 27,500 | ​ | 27,500 | ​ | 568,750 | ​ | —
Lease liabilities | ​ | 10,939 | ​ | 5,653 | ​ | 11,209 | ​ | 25,012
Trade payables | ​ | 102,125 | ​ | — | ​ | — | ​ | —
To be paid to co-venturers (Note 34) | ​ | 2,815 | ​ | — | ​ | — | ​ | —
​ | ​ | 143,379 | ​ | 33,153 | ​ | 579,959 | ​ | 25,012
As of December 31, 2021 | ​ |  | ​ |  | ​ |  | ​ |
Borrowings | ​ | 40,943 | ​ | 38,550 | ​ | 263,550 | ​ | 513,750
Lease liabilities | ​ | 9,230 | ​ | 6,558 | ​ | 5,820 | ​ | 2,871
Trade payables | ​ | 85,132 | ​ | 1,540 | ​ | — | ​ | —
To be paid to co-venturers (Note 34) | ​ | 953 | ​ | — | ​ | — | ​ | —
​ | ​ | 136,258 | ​ | 46,648 | ​ | 269,370 | ​ | 516,621
​
Schedule of Fair Value Hierarchy | The following table presents the Group’s financial assets and financial liabilities measured and recognized at fair value as of December 31, 2022 and 2021 on a recurring basis: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | As of December 31,
Amounts in US$ ‘000 | ​ | Level 1 | ​ | Level 2 | ​ | 2022
Assets | ​ |  | ​ |  | ​ |
Cash and cash equivalents | ​ |  | ​ |  | ​ |
Money market funds | ​ | 242 | ​ | — | ​ | 242
Derivative financial instrument assets | ​ |  | ​ |  | ​ |
Commodity risk management contracts | ​ | — | ​ | 967 | ​ | 967
Total Assets | ​ | 242 | ​ | 967 | ​ | 1,209
Liabilities | ​ | ​ | ​ | ​ | ​ | ​
Derivative financial instrument liabilities | ​ | ​ | ​ | ​ | ​ | ​
Commodity risk management contracts | ​ | — | ​ | 19 | ​ | 19
Total Liabilities | ​ | — | ​ | 19 | ​ | 19
​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | As of December 31,
Amounts in US$ ‘000 | ​ | Level 1 | ​ | Level 2 | ​ | 2021
Assets | ​ |  | ​ |  | ​ |
Cash and cash equivalents | ​ |  | ​ |  | ​ |
Money market funds | ​ | 427 | ​ | — | ​ | 427
Derivative financial instrument assets | ​ |  | ​ |  | ​ |
Commodity risk management contracts | ​ | — | ​ | 126 | ​ | 126
Total Assets | ​ | 427 | ​ | 126 | ​ | 553
Liabilities | ​ | ​ | ​ | ​ | ​ | ​
Derivative financial instrument liabilities | ​ | ​ | ​ | ​ | ​ | ​
Commodity risk management contracts | ​ | — | ​ | 20,757 | ​ | 20,757
Total Liabilities | ​ | — | ​ | 20,757 | ​ | 20,757
​
Cash At Bank And Other Financial Assets [Member] |
Disclosure of detailed information about financial instruments [line items] |
Disclosure of credit quality of cash at bank and other financial assets [text block] | Cash at bank and other financial assets (a) ​
​ | ​ | ​ | ​ | ​
Amounts in US$ ‘000 | ​ | 2022 | ​ | 2021
Counterparties with an external credit rating (Moody’s, S&P, Fitch, BRC Investor Services) | ​ |  | ​ |
Aaa | ​ | — | ​ | 3,529
Aa3 | ​ | 10,362 | ​ | 8
A1 | ​ | 96,077 | ​ | —
A2 | ​ | 57 | ​ | 53,114
A3 | ​ | 10,389 | ​ | 27,257
Baa1 | ​ | 39 | ​ | 1,605
Baa2 | ​ | 7,030 | ​ | 3,708
Baa3 | ​ | 1,352 | ​ | —
Ba1 | ​ | 64 | ​ | 67
Ba2 | ​ | 268 | ​ | 21
Ba3 | ​ | 3,066 | ​ | 5,117
B3 | ​ | 51 | ​ | —
Counterparties without an external credit rating | ​ | 12,953 | ​ | 20,908
Total | ​ | 141,708 | ​ | 115,334
(a) | The remaining balance sheet item ‘cash and cash equivalents’ corresponds to cash on hand amounting to US$ 12,000 (US$ 17,000 in 2021).

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