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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Thousands
 9 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Cash flows from operating activities:    
Net loss $ (27,232) $ (30,428)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation and amortization 5 85
Stock-based compensation 2,634 3,028
Foreign exchange (gain) loss, net 3,444 1,340
Performance bonds facility fee 1,717 0
Loss on remeasurement of assets classified as held for sale 0 376
Accretion of asset retirement obligations 908 774
Checkerboard fee 0 5,950
Accrued interest income (100) 0
Interest expense 151 317
Changes in operating assets and liabilities:    
Trade and other receivables (3,587) (566)
Prepaid expenses and other assets (1,523) (164)
Accounts payable and accrued expenses (4,234) (3,900)
Other non-current liabilities 780 (17)
Net cash used in operating activities (27,037) (23,205)
Cash flows from investing activities:    
Payments for property, plant and equipment (258) (231)
Payments for exploration and evaluation (79,739) (74,078)
Payments for assets under construction (24,384) (11,511)
Payments of third party costs for proposed Falcon Acquisition (3,040) 0
Proceeds from sale of assets held for sale 0 7,990
Payment of interest on borrowings (2,940) 0
Payment of interest on finance lease liabilities (2,552) (2,020)
Proceeds from government grants for exploration 120 6,169
Net cash used in investing activities (112,793) (73,681)
Cash flows from financing activities:    
Proceeds from issue of common stock 110,368 0
Proceeds from issue of shares under greenshoe option 0 7,410
Contributions received from noncontrolling interest holders 55,396 48,457
Common stock issue transaction costs (5,207) (479)
Payment of performance bond facility establishment fee (271) (536)
Proceeds from borrowings 43,997 0
Payment of debt issuance costs (3,329) 0
Repayment of lease liabilities (6,906) (6,508)
Net cash from financing activities 194,048 48,344
Net (decrease) increase in cash and cash equivalents and restricted cash 54,217 (48,542)
Cash and cash equivalents and restricted cash at the beginning of period 45,161 74,746
Effects of exchange rate changes on cash and cash equivalents 2,539 (569)
Cash and cash equivalents and restricted cash at the end of period 101,917 25,635
Non-cash investing and financing activities:    
Accrued capital expenditure 8,543 9,872
Asset retirement obligations (60) (477)
Stock-based compensation (1,673) (4,476)
Contribution receivable from noncontrolling interest holders 185 6,765
Operating lease right-of-use assets and lease liabilities (1,725) (225)
Interest accrued on finance lease liabilities (283) (524)
Finance lease right-of-use assets and lease liabilities (1,796) (5,898)
Accrued debt issuance costs (244) 0
Interest and fee payable (731) 0
Non-cash finance lease costs capitalized to unproved properties 6,647 7,817
Non-cash equity issuance transactions $ 2,188 $ 0