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Loans and borrowings - Terms and conditions of Senior Syndicated Facility Agreement (Details) $ in Thousands |  | 1 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jun. 14, 2023 USD ($) | Feb. 28, 2023 USD ($) D facility | Jun. 30, 2023 USD ($)
Loans and borrowings |  |  |
Proceeds from loans and borrowings (net of financing costs) |  |  | $ 476,657
Senior Syndicated Facility Agreement |  |  |
Loans and borrowings |  |  |
Number of credit facilities | facility |  | 2 |
Minimum required Debt Service Cover Ratio |  |  | 1.2
Margin rate (as a percent) |  | 3.00% |
Default additional interest rate on overdue payments (as a percent) |  | 2.00% |
Minimum percentage of scheduled copper production to be hedged |  | 30.00% |
Senior Syndicated Facility Agreement | Minimum |  |  |
Loans and borrowings |  |  |
Interest rate in addition to Interest Rate Margin per day (as a percent) |  | 0.00% |
Facility A |  |  |
Loans and borrowings |  |  |
Principal amount |  | $ 205,000 |
Minimum required Debt Service Cover Ratio |  | 1.50 |
Percentage of excess cash to be applied for repayment of loan (as a percent) |  | 30.00% |
Loan life (in years) |  | 5 years |
Number of days written notice required for redemption of the borrowings | D |  | 5 |
Minimum required amount of prepayment |  | $ 500 |
Discount and transaction costs incurred | $ 10,000 |  |
Facility B |  |  |
Loans and borrowings |  |  |
Principal amount |  | $ 25,000 |
Loan life (in years) |  | 3 years |
Number of days written notice required for redemption of the borrowings | D |  | 5 |
Minimum required amount of prepayment |  | $ 2,000 |
Proceeds from loans and borrowings (net of financing costs) |  |  | $ 0

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