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FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS
 6 Months Ended
Jun. 30, 2026
Fair Value Disclosures [Abstract]  
FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS FAIR VALUE MEASUREMENTS AND FINANCIAL INSTRUMENTS
As required by accounting guidance, assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. Refer to Note 12 to the audited Consolidated Financial Statements in the Company’s 2025 Annual Report on Form 10-K for additional information on the Company's assets and liabilities measured at fair value. The following tables set forth the Company’s assets and liabilities measured at fair value on a recurring (at least annually) and nonrecurring basis by level within the fair value hierarchy (in thousands):
Fair value at June 30, 2026
Level 1
Level 2
Level 3Total
Assets:
Cash$1,783,042 $— $— $1,783,042 
Marketable securities (1)
50,922 — — 50,922 
Trade receivables from provisional sales, net (2)
— 41,924 — 41,924 
Derivative assets (3)
— 4,387 — 4,387 
Deferred consideration— — 27,552 27,552 
$1,833,964 $46,311 $27,552 $1,907,827 
Liabilities:
Contingent consideration liabilities
$— $— $77,306 $77,306 
$— $— $77,306 $77,306 
(1)Marketable securities of publicly quoted companies, consisting of investments, are valued using a market approach based upon unadjusted quoted prices in an active market obtained from securities exchanges.
(2)The Company’s provisional metal sales contracts, included in Trade and other receivables in the Condensed Consolidated Balance Sheets, are valued using inputs derived from observable market data, including quoted commodity forward prices. The inputs do not involve significant management judgment. Such instruments are classified within Level 2 of the fair value hierarchy. The changes in fair value of provisional metal sales have been recorded in Revenue in the Condensed Consolidated Statements of Operations.
(3)At times, the Company manages a portion of its exposure to fluctuation in diesel prices and foreign currency exchange rates through derivative financial instruments. In periods when the Company has open derivative positions, the derivative assets and liabilities are valued using pricing models with inputs derived from observable market data, including quoted prices in active markets. The Company’s diesel collar instruments, included in Prepaids and other current assets in the Condensed Consolidated Balance Sheets, are valued using inputs derived from observable market data, including quoted commodity forward prices. The inputs do not involve significant management judgment. Such instruments are classified within Level 2 of the fair value hierarchy. As of June 30, 2026, the Company has outstanding diesel collar contracts with an aggregate notional volume of approximately 7.4 million gallons, which are expected to settle through December 2026. The gain of $11.9 million resulting from diesel collar contracts has been recorded in Cost of sales in the Condensed Consolidated Statements of Operations.
Fair value at December 31, 2025
Level 1
Level 2
Level 3Total
Assets:
Cash$515,561 $— $— $515,561 
Marketable securities (1)
40,779 — — 40,779 
Trade receivables from provisional sales, net (2)
— 90,148 — 90,148 
Deferred consideration— — 27,755 27,755 
$556,340 $90,148 $27,755 $674,243 
Liabilities:
Contingent consideration liabilities
$— $— $162,207 $162,207 
Other
— 1,202 — 1,202 
$— $1,202 $162,207 $163,409 
(1)Marketable securities of publicly quoted companies, consisting of investments, are valued using a market approach based upon unadjusted quoted prices in an active market obtained from securities exchanges.
(2)The Company’s provisional metal sales contracts, included in Trade and other receivables in the Condensed Consolidated Balance Sheets, are valued using inputs derived from observable market data, including quoted commodity forward prices. The inputs do not involve significant management judgment. Such instruments are classified within Level 2 of the fair value hierarchy.
Deferred and contingent consideration are included in Level 3 as certain assumptions used in the calculation of the fair value are not based on observable market data. The following table reconciles the beginning and ending balances for financial instruments that are recognized at fair value using significant unobservable inputs (Level 3) in the Condensed Consolidated Financial Statements (in thousands):
Six Months Ended June 30,
20262025
Deferred consideration assets:
Balance as of January 1$27,755 $26,383 
Revaluations1,047 1,683 
Collections
(1,250)(1,250)
Balance as of June 30
$27,552 $26,816 
Six Months Ended June 30,
20262025
Contingent consideration liabilities:
Balance as of January 1$162,207 $— 
Revaluations2,599 4,522 
Additions
— 135,462 
Payments (1)
(87,500)— 
Balance as of June 30
$77,306 $139,984 
(1)During the first quarter of 2026, the Company completed the payment of $87.5 million to Newmont and was relieved of the contingent payment associated with the Carlton Tunnel. Refer to Note 3 for additional information.
Fair values of financial assets and liabilities not already measured at fair value
The fair value of the 2019 Notes as compared to the carrying amounts were as follows (in thousands): 
June 30, 2026December 31, 2025
LevelCarrying amountFair valueCarrying amountFair value
2019 Notes (1) 
1$— $— $229,640 $300,677 
(1)The fair value disclosed for the Company’s 2019 Notes is included in Level 1 as the basis of valuation uses a quoted price in an active market. During the first quarter of 2026, holders of the 2019 Notes exercised their conversion rights and elected to convert their holdings to common shares. Refer to Note 16 for additional information.