Commitments (Tables)

3 Months Ended

Mar. 31, 2022

Commitments [Abstract]

Future Minimum Royalties

(in US$ thousands)		Amount
Year ending December 31,
2022	$	5,265
2023		5,145
2024		5,056
2025		4,893
2026		4,813
Thereafter		24,695
Total	$	49,867
Mineral leases are not in scope of ASC 842 and continue to be accounted for under the guidance in ASC 932, Extractive Activities – Mining.