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Exploration properties (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2026 USD ($)
Mineral Interests Exploration [Roll Forward]
Balance at December 31, 2025	$ 224,145
Acquisition costs	1,494
Divestment (Note 12)	(13,607)
Balance at March 31, 2026	212,032
Santa Cruz
Mineral Interests Exploration [Roll Forward]
Balance at December 31, 2025	177,523
Acquisition costs	0
Divestment (Note 12)	0
Balance at March 31, 2026	177,523
Tintic
Mineral Interests Exploration [Roll Forward]
Balance at December 31, 2025	30,703
Acquisition costs	0
Divestment (Note 12)	0
Balance at March 31, 2026	30,703
Alacrán
Mineral Interests Exploration [Roll Forward]
Balance at December 31, 2025	13,607
Acquisition costs	0
Divestment (Note 12)	(13,607)
Balance at March 31, 2026	0
Other
Mineral Interests Exploration [Roll Forward]
Balance at December 31, 2025	2,312
Acquisition costs	1,494
Divestment (Note 12)	0
Balance at March 31, 2026	$ 3,806

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Disposal Group, Including Discontinued Operation, Gain (Loss) On Disposition Of Exploration Properties

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Mineral properties, net of adjustments.

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-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-SubTopic 10
-Topic 360
-Publisher FASB
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The cash outflow from the acquisition of a mineral right which is the right to extract a mineral from the earth or to receive payment, in the form of royalty, for the extraction of minerals.

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-Topic 230
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-Name Accounting Standards Codification
-Section 45
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