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SIGNIFICANT ACCOUNTING POLICIES (Policies)
6 Months Ended
Jun. 30, 2026
Accounting Policies [Abstract]  
Statement of compliance and consolidation [Policy Text Block]

a) Statement of compliance and consolidation

The Interim Financial Statements have been prepared in accordance with accounting principles generally accepted in the United States ("U.S. GAAP") and are presented in United States dollars ("$" or "USD"), unless otherwise indicated.

The Interim Financial Statements include the accounts of LCG and its wholly owned subsidiaries, Quaterra Alaska Inc. ("QTA") which holds a 100% interest in Singatse Peak Services LLC ("SPS"), MRE LLC, and Lyon Development LLC, as well as its partially owned consolidated entity, Blue Copper Royalties LLC ("BCR"). Falcon Copper Corp. ("FCC") was deconsolidated effective December 31, 2025 (Note 3).

The Company consolidates entities over which it has control. Control exists when the Company has power over the relevant activities, exposure to variable returns, and the ability to affect those returns through its power over the entity.

The Company reassesses control when events or circumstances indicate a change in its ability to direct the activities of a subsidiary. Changes in consolidation status are applied prospectively, with assets and liabilities initially recorded at fair value. A gain or loss may be recognized upon deconsolidation of a subsidiary, depending on the carrying amounts of deconsolidated assets and liabilities compared to the fair value of retained interests and ongoing contractual arrangements.

The significant accounting policies applied in the preparation of these Interim Financial Statements are consistent with those disclosed in Note 3 of the Company's audited consolidated financial statements for the year ended December 31, 2025.

In preparing these Interim Financial Statements, management has applied the same judgements, estimates and assumptions as those applied to the audited consolidated financial statements as at and for the year ended December 31, 2025.