21. Fair Value Measurement

Fair value accounting establishes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). The three levels of the fair value hierarchy are described below:

Level 1

Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities;

Level 2

Quoted prices in markets that are not active, or inputs that are observable, either directly or indirectly, for substantially the full term of the asset or liability; and

Level 3

Prices or valuation techniques that require inputs that are both significant to the fair value measurement and unobservable (supported by little or no market activity.)

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. These assets and liabilities are remeasured for each reporting period. The following tables set forth certain of the Company’s assets and liabilities measured at fair value by level within the fair value hierarchy as of December 31, 2025 and 2024:

  ​ ​ ​

As of

As of

  ​ ​ ​

December 31, 

December 31,

Input Hierarchy Level

2025

  ​ ​ ​

2024

(in thousands)

Cash equivalents

$

22,141

$

20

Level 1

Accounts receivable, net

$

13,253

$

2,184

Level 2

Investment in equity securities-Green Light Metals

$

-

$

852

Level 3

The following methods and assumptions were used to estimate the fair value of each class of financial instrument:

Cash equivalents: Cash equivalents primarily consist of a sweep account into money market funds, which are held at cost, which approximates fair value.

Accounts receivable, net: Accounts receivable, net include amounts due to the Company for deliveries of concentrates and doré sold to customers. Concentrate sales contracts provide for provisional pricing as specified in such contracts. These sales contain an embedded derivative related to the provisional pricing mechanism which is bifurcated and accounted for as a derivative. At the end of each reporting period, the Company records an adjustment to sales to reflect the mark-to-market of outstanding provisional invoices based on the forward price curve. Because these provisionally priced sales have not yet settled as of the reporting date, the mark-to-market adjustment related to these invoices is included in accounts receivable as of each reporting date. At December 31, 2025 and 2024, the Company had

an unrealized gain of $5.9 million and an unrealized loss of $7 thousand, respectively, included in its accounts receivable on the accompanying Consolidated Balance Sheets related to mark-to-market adjustments. Please see Item 8. Financial Statements —Note 16. Derivatives for additional information.

Investment in equity securities—Green Light Metals: Upon maturity on December 28, 2022, the Company received 12,250,000 private shares of Green Light Metals, which settled the promissory note receivable from Green Light Metals. The shares received represented approximately 28.5% ownership at the time. In the first quarter of 2025, through Aquila, the Company entered into a share purchase agreement with multiple purchasers to sell all of its interest in the Green Light Metals shares, for C$0.10 per share, for total net proceeds of C$1.2 million ($0.9 million), which was received on February 11, 2025. As of December 31, 2024, the value of this equity investment was $0.9 million.

Gains and losses related to changes in the fair value of embedded derivates (in thousands) in accounts receivable were included in the Company’s Consolidated Statements of Operations as shown in the following:

For the year ended December 31, 

Statements of Operations Classification

  ​ ​ ​

  ​ ​ ​

2025

  ​ ​ ​

2024

  ​ ​ ​

Note

Realized and unrealized derivative gain, net

16

$

6,503

$

970

Sales, net

Realized/Unrealized Derivatives

The following tables summarize the Company’s realized/unrealized derivatives, net (in thousands):

Gold

Silver

Copper

Lead

Zinc

Total

For the year ended December 31, 2025

Realized gain (loss)

$

267

$

421

$

4

$

(10)

$

(79)

$

603

Unrealized gain

338

5,504

34

20

4

5,900

Total realized/unrealized derivatives, net

$

605

$

5,925

$

38

$

10

$

(75)

$

6,503

Gold

Silver

Copper

Lead

Zinc

Total

For the year ended December 31, 2024

Realized gain

$

463

$

351

$

83

$

18

$

316

$

1,231

Unrealized (loss) gain

(46)

(47)

(29)

8

(147)

(261)

Total realized/unrealized derivatives, net

$

417

$

304

$

54

$

26

$

169

$

970

Historical Timeline

Fiscal YearFiled
2025Mar 18, 2026Showing above
2024Apr 8, 2025
2023Mar 28, 2024
2022Mar 13, 2023
2021Mar 10, 2022
2020Feb 24, 2021
2019Mar 2, 2020
2018Feb 26, 2019
2017Mar 8, 2018
2016Feb 28, 2017
2015Mar 9, 2016

About Fair Value Disclosures

Fair value disclosures classify all assets and liabilities measured at fair value into a three-level hierarchy: Level 1 (quoted market prices), Level 2 (observable inputs like yield curves), and Level 3 (unobservable inputs requiring management estimates). The proportion of Level 3 assets directly reflects how much of the balance sheet depends on internal models rather than market evidence.

Key signals: a growing Level 3 balance relative to total fair-value assets increases valuation uncertainty and earnings volatility risk. Watch for transfers between levels — assets moving from Level 2 to Level 3 often signal deteriorating market liquidity. Unrealized gains and losses on Level 3 positions flow through earnings or other comprehensive income, so large swings deserve scrutiny. For financial institutions, examine the sensitivity disclosures that show how Level 3 valuations change under alternative assumptions. Compare the fair value of debt against its carrying amount to gauge hidden leverage.