Commitments	6 Months Ended
Commitments	Jun. 30, 2026
Commitments [Abstract]
Commitments	18. Commitments (a) Mineral Leases The Company leases mineral interests and surface rights from land owners under various terms and royalty rates. The future minimum royalties and lease rental payments under these leases as of June 30, 2026 were as follows: (in US$ thousands) Amount Year ending December 31, 2026 $ 3,277 2027 4,321 2028 4,288 2029 4,282 2030 7,837 Thereafter 19,863 Total $ 43,868 Mineral leases are not in scope of ASC 842 and continue to be accounted for under the guidance in ASC 932, Extractive Activities – Mining. (b) Other commitments As of June 30, 2026, purchase commitments for capital expenditures were $ 8.1 million, all of which is obligated within the next twelve months. In Australia, the Company has generally secured the ability to transport coal through rail contracts and coal export terminal contracts that are primarily funded through take-or-pay arrangements with terms ranging up to 12 years . In the U.S., the Company typically negotiates its rail and coal terminal access on an annual basis. As of June 30, 2026, these Australian and U.S. commitments under take-or-pay arrangements totaled $ 553.0 million, of which the Company is obliged to pay approximately $ 101.9 million within the next twelve months.