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Fair value measurement (Tables) | 6 Months Ended
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Jun. 30, 2023
Disclosure of detailed information about financial instruments [line items] |
Summary of carrying values, fair values and fair value hierarchy of the Group's financial instruments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | 30 June 2023 |  | 31 December 2022 |  | 1 January 2022
US$ thousand | ​ | Level | ​ | Carrying value |  | Fair value | ​ | Carrying value |  | Fair value | ​ | Carrying value |  | Fair value
Financial assets |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortized cost |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade and other receivables |  | ​ | ​ | 20,881 |  | 20,881 |  | 53 |  | 53 |  | — |  | —
​ |  | ​ | ​ | 20,881 |  | 20,881 |  | 53 |  | 53 |  | — |  | —
Fair value through profit or loss |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | 1 |  | 43,732 |  | 43,732 |  | 42 |  | 42 |  | 955 |  | 955
Investments |  | 1 |  | — |  | — |  | 268,909 |  | 268,909 |  | 265,156 |  | 265,156
Derivative financial assets |  |  |  |  |  |  |  |  |  |  |  |  |  |
Silver stream embedded derivative |  | 3 |  | 3,740 |  | 3,740 |  | — |  | — |  | — |  | —
Copper stream embedded derivative |  | 3 |  | 5,479 |  | 5,479 |  | — |  | — |  | — |  | —
​ | ​ | ​ |  | 52,951 |  | 52,951 |  | 268,951 |  | 268,951 |  | 266,111 |  | 266,111
Total financial assets |  |  |  | 73,832 |  | 73,832 |  | 269,004 |  | 269,004 |  | 266,111 |  | 266,111
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Financial liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortized cost |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade and other payables |  |  |  | 63,754 |  | 63,754 |  | 927 |  | 927 |  | 604 |  | 604
Lease liability |  |  |  | 16,247 |  | 16,247 |  | — |  | — |  | — |  | —
Loans and borrowings |  |  |  | 425,907 |  | 425,907 |  | 786 |  | 786 |  | — |  | —
Other financial liabilities (excluding contingent consideration) |  |  |  | 10,326 |  | 10,326 |  | 280,996 |  | 285,428 |  | 253,530 |  | 274,436
​ | ​ | ​ |  | 516,234 |  | 516,234 |  | 282,709 |  | 287,141 |  | 254,134 |  | 275,040
Fair value through profit or loss |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other financial liabilities (contingent consideration) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Royalty Deed |  | 3 |  | 43,130 |  | 43,130 |  | — |  | — |  | — |  | —
Contingent copper consideration |  | 3 |  | 97,200 |  | 97,200 |  | — |  | — |  | — |  | —
Deferred consideration |  | 2 |  | 75,000 |  | 75,000 |  | — |  | — |  | — |  | —
Derivative financial liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |
Public Warrants |  | 1 |  | 12,374 |  | 12,374 |  | 4,335 |  | 4,335 |  | 5,174 |  | 5,174
Private Warrants |  | 2 |  | 9,150 |  | 9,150 |  | 3,107 |  | 3,107 |  | 3,266 |  | 3,266
Mezz Warrants |  | 3 |  | 13,310 |  | 13,310 |  | — |  | — |  | — |  | —
Mezz Facility embedded derivative |  | 2 |  | 42,821 |  | 42,821 |  | — |  | — |  | — |  | —
​ | ​ | ​ |  | 292,985 |  | 292,985 |  | 7,442 |  | 7,442 |  | 8,440 |  | 8,440
Total financial liabilities |  |  |  | 809,219 |  | 809,219 |  | 290,151 |  | 294,583 |  | 262,574 |  | 283,480
Summary of fair values of the Group's derivative financial assets and liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | 30 June |  | 31 December |  | 1 January
US$ thousand | ​ | Note | ​ | 2023 | ​ | 2022 | ​ | 2022
Derivative financial assets |  |  |  |  |  |  |  |
Current |  |  |  |  |  |  |  |
Silver stream embedded derivative |  | (a) |  | 705 |  | — |  | —
Copper stream embedded derivative |  | (b) |  | 9 |  | — |  | —
​ | ​ | ​ |  | 714 |  | — | ​ | —
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Non-current |  |  |  |  |  |  |  |
Silver stream embedded derivative |  | (a) |  | 3,035 |  | — |  | —
Copper stream embedded derivative |  | (b) |  | 5,470 |  | — |  | —
​ | ​ | ​ |  | 8,505 |  | — |  | —
Total derivative financial assets | ​ | ​ |  | 9,219 |  | — |  | —
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Derivative financial liabilities |  |  |  |  |  |  |  |
Current |  |  |  |  |  |  |  |
Warrants |  | (c) |  | — |  | — |  | —
Mezz facility embedded derivative |  | (d) |  | 11,792 |  | — |  | —
Conversion option |  | (e) |  | — |  | — |  | —
​ | ​ | ​ |  | 11,792 |  | — |  | —
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Non-current |  |  |  |  |  |  |  |
Warrants |  | (c) |  | 34,834 |  | 7,443 |  | 8,440
Mezz facility embedded derivative |  | (d) |  | 31,029 |  | — |  | —
Conversion option |  | (e) |  | — |  | — |  | —
​ | ​ | ​ |  | 65,863 |  | 7,443 |  | 8,440
Total derivative financial liabilities | ​ | ​ |  | 77,655 |  | 7,443 |  | 8,440
Summary of fair values of the contingent consideration | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | 30 June |  | 31 December |  | 1 January
US$ thousand | ​ | Note | ​ | 2023 | ​ | 2022 | ​ | 2022
Royalty deed |  | (a) |  | 43,130 |  | — |  | —
Contingent copper consideration |  | (b) |  | 97,200 |  | — |  | —
Deferred consideration |  | (c) |  | 75,000 |  | — |  | —
​ | ​ | ​ |  | 215,330 |  | — | ​ | —
Royalty Deed |
Disclosure of detailed information about financial instruments [line items] |
Summary of a continuity schedule for liabilities | ​
​ | ​ | ​ | ​ | ​
​ |  | Six months ended 30 June
US$ thousand | ​ | 2023 |  | 2022
Balance, beginning of period |  | — |  | —
Initial recognition |  | 43,130 |  | —
Change in fair value |  | — |  | —
Royalty payments |  | — |  | —
Balance, end of period |  | 43,130 |  | —
Contingent copper consideration |
Disclosure of detailed information about financial instruments [line items] |
Summary of a key inputs were used for the valuation of assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 30 June |  | 31 December |  | 1 January
​ | ​ | 2023 | ​ | 2022 | ​ | 2022
Long-term copper price | ​ | $ | 3.63 |  | — |  | —
Copper spot price | ​ | $ | 3.77 |  | — |  | —
Annual price volatility | ​ |  | 25.70 | % | — |  | —
Annual inflation rate | ​ |  | 1.07 | % | — |  | —
Risk-free rate | ​ |  | 3.97 | % | — |  | —
Reversion factor | ​ |  | 11.55 | % | — |  | —
Summary of a continuity schedule for liabilities | ​
​ | ​ | ​ | ​ | ​
​ | ​ | Six months ended 30 June
US$ thousand |  | 2023 |  | 2022
Balance, beginning of period |  | — |  | —
Initial recognition |  | 97,200 |  | —
Change in fair value |  | — |  | —
Balance, end of period |  | 97,200 |  | —
Warrant Liability [Member] |
Disclosure of detailed information about financial instruments [line items] |
Summary of warrants | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Private |  | ​
​ | ​ | ​ | ​ | Placement | ​ | ​
US$ thousand | ​ | Public Warrants | ​ | Warrants | ​ | Mezz Warrants
For six months ended 30 June 2023 | ​ | ​ | ​ | ​ | ​ | ​
Balance, beginning of period |  | 4,335 |  | 3,108 |  | —
Promissory note conversion warrants |  | — |  | 102 |  | —
Issuance of warrants |  | — |  | — |  | 13,665
Change in fair value |  | 8,039 |  | 5,940 |  | (355)
Balance, end of period |  | 12,374 |  | 9,150 |  | 13,310
For six months ended 30 June 2022 |  |  |  |  |  |
Balance, beginning of period |  | 5,174 |  | 3,266 |  | —
Issuance of warrants |  | — |  | 480 |  | —
Change in fair value |  | (401) |  | (325) |  | —
Exercise of warrants |  | — |  | — |  | —
Balance, end of period |  | 4,773 |  | 3,421 |  | —
Summary of assumptions used for valuation of liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 30 June |  | 31 December |  | 1 January
​ | ​ | 2023 | ​ | 2022 | ​ | 2022
Risk-free rate |  | ​ | 3.93 | % | — |  | —
Warrant expected life |  | ​ | 5 years |  | — |  | —
Expected volatility |  | ​ | 53.94 | % | — |  | —
Expected dividend yield |  | ​ | 0 | % | — |  | —
Share price | ​ | $ | 10.30 |  | — |  | —
Mezz Facility Embedded Derivative [Member] |
Disclosure of detailed information about financial instruments [line items] |
Summary of a continuity schedule for liabilities | ​
​ | ​ | ​ | ​ | ​
​ |  | Six months ended 30 June
US$ thousand | ​ | 2023 |  | 2022
Balance, beginning of period |  | — |  | —
Initial recognition |  | 42,098 |  | —
Change in fair value |  | 723 |  | —
Balance, end of period |  | 42,821 |  | —
Conversion Option of Sponsor Convertible Note [Member] |
Disclosure of detailed information about financial instruments [line items] |
Summary of assumptions used for valuation of liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 24 May 2022 |  | ​ | ​ |
​ | ​ | Conversion (Final | ​ | 6 May 2022 Borrowing |
​ | ​ | Measurement) | ​ | (Initial Measurement) |
Underlying warrant value | ​ | $ | 0.60 | ​ | $ | 0.80 | ​
Exercise price | ​ | $ | 1.50 | ​ | $ | 1.50 | ​
Holding period | ​ |  | 0.35 | ​ |  | 0.40 | ​
Risk-free rate | ​ |  | 1.25 | % |  | 1.18 | %
Volatility | ​ |  | 59.57 | % |  | 55.35 | %
Silver stream embedded derivative |
Disclosure of detailed information about financial instruments [line items] |
Summary of a key inputs were used for the valuation of assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 30 June |  | 31 December |  | 1 January
​ | ​ | 2023 | ​ | 2022 | ​ | 2022
Silver spot price (per oz) | ​ | $ | 22.81 |  | — |  | —
Own credit spread | ​ |  | 8.81 | % | — |  | —
Average silver price (per oz) | ​ | $ | 24.38 |  | — |  | —
Summary of a continuity schedule for embedded derivative assets | ​
​ | ​ | ​ | ​ | ​
​ |  | Six months ended 30 June
US$ thousand | ​ | 2023 | ​ | 2022
Balance, beginning of period |  | — |  | —
Initial recognition |  | — |  | —
Change in fair value |  | 3,740 |  | —
Balance, end of period |  | 3,740 |  | —
Copper stream embedded derivative |
Disclosure of detailed information about financial instruments [line items] |
Summary of a key inputs were used for the valuation of assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 30 June |  | 31 December |  | 1 January
​ | ​ | 2023 | ​ | 2022 | ​ | 2022
Copper spot price (per tonne) | ​ | $ | 8,323 |  | — |  | —
Copper price volatility | ​ |  | 26.35 | % |  |  |
Own credit spread | ​ |  | 9.49 | % | — |  | —
Average copper price (per tonne) | ​ | $ | 8,341 |  | — |  | —
Summary of a continuity schedule for embedded derivative assets | ​
​ | ​ | ​ | ​ | ​
​ |  | Six months ended 30 June
US$ thousand | ​ | 2023 | ​ | 2022
Balance, beginning of period |  | — |  | —
Initial recognition |  | 4,430 |  | —
Change in fair value |  | 1,049 |  | —
Balance, end of period |  | 5,479 |  | —

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