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MINERAL PROPERTIES, PLANT AND EQUIPMENT, NET - Components of Mineral Properties, Plant and Equipment, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Property, Plant and Equipment [Line Items]
Total mineral properties, plant, and equipment	$ 5,744,371	$ 5,271,727
Accumulated depreciation, plant and equipment	(898,877)	(804,411)
Accumulated depletion, mineral properties	(729,424)	(684,449)
Mineral properties, plant, and equipment, net	4,116,070	3,782,867
Finance lease, right-of-use asset, before accumulated amortization	74,300	78,900
Plant and equipment
Property, Plant and Equipment [Line Items]
Total mineral properties, plant, and equipment	2,074,930	1,883,193
Construction in process
Property, Plant and Equipment [Line Items]
Total mineral properties, plant, and equipment	210,997	135,594
Mineral properties subject to depletion
Property, Plant and Equipment [Line Items]
Total mineral properties, plant, and equipment	2,315,871	2,114,765
Mineral properties not yet subject to depletion
Property, Plant and Equipment [Line Items]
Total mineral properties, plant, and equipment	895,409	884,029
Exploration and evaluation assets
Property, Plant and Equipment [Line Items]
Total mineral properties, plant, and equipment	$ 247,164	$ 254,146

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- Definition

Property, Plant, and Equipment and Finance Lease Right-of-Use Asset, after Accumulated Depreciation and Amortization Including Mineral Properties, Accumulated Depletion

+ References

No definition available.

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Amount, before accumulated amortization, of right-of-use asset from finance lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (a)
-SubTopic 20
-Topic 842
-Publisher FASB
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The accumulated decrease in the carrying value of the mineral properties as a result of mine or mineral production.

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Amount of accumulated depreciation and amortization from plant, property, and equipment and right-of-use asset from finance lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 360
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482099/360-10-50-1

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Amount, before accumulated depreciation and amortization, of property, plant, and equipment and finance lease right-of-use asset.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 360
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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