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General and Administrative Expenses (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
General and Administrative Expenses        
Salaries and benefits $ 2.5 $ 2.7 $ 5.0 $ 5.3
Professional fees 2.3 1.5 3.7 3.1
Cobre Panama arbitration expenses 0.8   2.3  
Community contributions 0.3   0.4 0.1
Board of Directors' costs 0.1 0.2 0.2 0.3
Office, insurance and other expenses 2.4 1.8 2.5 3.6
General and administrative expenses $ 8.4 $ 6.2 $ 14.1 $ 12.4