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Finance income and costs (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022
Finance income |  |  |
Income from marketable securities | $ 5,330 | $ 365 |
Foreign exchange gain | 130 |  |
Total finance income | 5,460 | 365 | $ 3,753
Finance costs |  |  |
Interest expense under the effective interest rate method on:- Loans and borrowings | (2,324) |  |
Interest expense under the effective interest rate method on:- Other financial liabilities | (7,762) | (9,830) |
Interest expense under the effective interest rate method on:- Lease liabilities | (41) |  |
Amortisation of discount on convertible promissory note |  | (8) |
Finance costs | (10,127) | (9,838) | (20,234)
Net change in fair value measurements of financial assets and liabilities |  |  |
Net change in fair value of financial instruments | (9,558) | 733 |
Net finance costs | (14,225) | (8,740) | $ (14,997)
Warrant |  |  |
Net change in fair value measurements of financial assets and liabilities |  |  |
Net change in fair value of financial instruments | (13,624) | 726 |
Embedded derivative - copper and silver stream agreements |  |  |
Net change in fair value measurements of financial assets and liabilities |  |  |
Net change in fair value of financial instruments | 4,789 |  |
Embedded derivative - mezzanine debt facility |  |  |
Net change in fair value measurements of financial assets and liabilities |  |  |
Net change in fair value of financial instruments | $ (723) |  |
Embedded derivative - conversion option |  |  |
Net change in fair value measurements of financial assets and liabilities |  |  |
Net change in fair value of financial instruments |  | $ 7 |

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- Definition The gross gain arising from exchange differences recognised in profit or loss, excluding those arising on financial instruments measured at fair value through profit or loss in accordance with IFRS 9. [Refer: Foreign exchange gain (loss)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 21 -IssueDate 2023-01-01 -Paragraph 52 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=21&code=ifrs-tx-2023-en-r&anchor=para_52_a&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 35 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_35&doctype=Standard -URIDate 2023-03-23 + Details
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