Commitments (Tables)

6 Months Ended

Jun. 30, 2022

Commitments [Abstract]

Future Minimum Royalties

(in US$ thousands)		Amount
Year ending December 31,
2022	$	4,182
2023		4,984
2024		4,891
2025		4,752
2026		4,684
Thereafter		23,666
Total	$	47,159
Mineral leases are not in scope of ASC 842 and continue to be accounted for under the guidance in ASC 932, Extractive Activities – Mining.