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MARKETABLE SECURITIES | 6 Months Ended
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Jun. 30, 2026
Cash and Cash Equivalents [Abstract] |
Marketable Securities | MARKETABLE SECURITIES Management invests excess cash in U.S. government notes, U.S. government agencies and tradeable certificates of deposits. After consideration of the Company’s risk versus reward objectives and its liquidity requirements, the Company elected the fair value option for its marketable debt securities because the Company may sell them prior to their stated maturities. Under the fair value option, these instruments are recorded on the Consolidated Balance Sheet at their fair value including interest income. Changes in fair value and interest income are recorded in Other income (loss) in the Consolidated Statements of Operations and Comprehensive Loss. As of June 30, 2026 and December 31, 2025, the Company’s current marketable debt securities are classified as current based on management’s intent to use the investments to manage excess cash and liquidity needs. While certain investments have stated contractual maturity dates greater than one year, including marketable debt securities invested in U.S. government notes, U.S. government agencies and tradable certificates of deposits, the Company may sell investments prior to maturity or reinvest excess cash in accordance with its cash management policy. On June 30, 2025, the Company entered into an amendment to the JV Agreements whereby the Company advanced AUD$13.00 million ($8.52 million) to the Donald Project JV for the acquisition of certain land and properties (the “First Advance”). Pursuant to a subsequent amendment to the JV Agreements, the Company agreed to advance additional cash to purchase mineral separation equipment (the “Second Advance”), of which AUD$2.87 million ($1.91 million) had been advanced as of December 31, 2025. An additional AUD$6.70 million ($4.86 million) was advanced following the satisfaction of certain contractual conditions in May 2026. Pursuant to a third amendment to the JV Agreements in 2026, the Company advanced AUD$14.50 million ($10.52 million) (the “Third Advance”, together with the First and Second Advances, the “Advances”) to fund the acquisition of certain properties. The First and Third Advances are secured by the underlying land and properties acquired while the Second Advance is secured by the mineral separation equipment acquired by the Donald Project JV. The Advances do not bear interest unless in the case of default. If a positive final investment decision (“FID”) is made on the Donald Project, the outstanding Advances are expected to be applied to the Company’s earn-in interest in the Donald Project JV. If a positive FID is not made, the Advances shall become due and payable subject to the terms of the JV Agreements, as amended. As the Advances are convertible into equity under specified circumstances, the Company accounts for the Advances as long-term marketable debt securities for which it has elected the fair value option, and changes in fair value are recorded in Other income (loss) in the Consolidated Statements of Operations and Comprehensive Loss. As of June 30, 2026, an FID has not been made on the Donald Project JV. The following table summarizes the Company’s marketable securities:
| Cost Basis |  | Gross Unrealized Losses |  | Gross Unrealized Gains |  | Fair Value
June 30, 2026 |  |  |  |  |  |  |
Current |  |  |  |  |  |  |
Marketable debt securities(1) | $ | 857,211 |  |  | $ | (1,525) |  |  | $ | — |  |  | $ | 855,686 |
Marketable equity securities | 28,159 |  |  | (5,507) |  |  | — |  |  | 22,652 |
Total marketable securities | $ | 885,370 |  |  | $ | (7,032) |  |  | $ | — |  |  | $ | 878,338 |
Non-current |  |  |  |  |  |  |
Marketable debt securities(2) | $ | 25,790 |  |  | $ | (885) |  |  | $ | — |  |  | $ | 24,905 |
December 31, 2025 |  |  |  |  |  |  |
Current |  |  |  |  |  |  |
Marketable debt securities(1) | $ | 771,505 |  |  | $ | — |  |  | $ | 4,827 |  |  | $ | 776,332 |
Marketable equity securities | 28,159 |  |  | (7,385) |  |  | — |  |  | 20,774 |
Total marketable securities | $ | 799,664 |  |  | $ | (7,385) |  |  | $ | 4,827 |  |  | $ | 797,106 |
Non-current |  |  |  |  |  |  |
Marketable debt securities(2) | $ | 10,416 |  |  | $ | (175) |  |  | $ | — |  |  | $ | 10,241 |
(1) Marketable debt securities are comprised primarily of U.S. Treasury Bills and Government Agency Bonds. (2) Advances to the Donald Project JV.

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