C$235 million cash decline as NexGen accelerates Rook I construction

Rook I construction drives NexGen’s cash burn

NexGen Energy Ltd. (ASX:NXG) is no longer just financing a uranium development story on paper. Its Rook I project has entered major construction, with C$246.3 million added to mineral property, plant and equipment during the first nine months of 2026 and C$721.6 million of previously capitalised exploration assets transferred into assets under construction.

That accounting shift captures the project’s change in status after NexGen received its licence to prepare the site and commence construction in March. Licensed construction began on June 8, while shaft preparation activities started on September 28 after the company awarded a shaft-sinking contract. The milestone follows the final Rook I construction approval, which was reported in March as the last federal approval needed to begin work.

Nine-month loss remains largely non-cash

NexGen recorded a net loss of C$103.8 million for the nine months ended September 30, down from C$266.8 million a year earlier. The result included C$46.5 million in share-based payments and a C$6.9 million mark-to-market loss on convertible debentures, while finance income rose to C$20.2 million as the company held larger cash balances following its 2025 equity raising.

The quarterly result was less severe, with a C$22.3 million loss compared with C$129.2 million in the corresponding quarter of 2025. A C$25.6 million mark-to-market gain on the debentures helped narrow the latest quarter’s loss, illustrating why NexGen’s reported earnings can move sharply with its share price and valuation assumptions rather than operating revenue. The company continues to report no revenue from operations.

Cash reserves face a capital-intensive build

Cash stood at C$567.2 million at September 30, down from C$802.6 million at the end of 2025. Short-term investments added another C$254.4 million, while cash used in investing activities reached C$233.0 million, including C$159.5 million spent on Rook I property, plant and equipment and C$99.8 million on exploration and evaluation assets.

NexGen says it has sufficient working capital to meet current obligations for at least the next 15 months under its stated assumptions, but also acknowledges that additional financing will be required to complete Rook I and continue exploration. The company’s own 2024 interim trend update put expected pre-production capital at approximately C$2.2 billion, up from about C$1.3 billion in the earlier feasibility study. That makes the current cash balance a construction buffer, not a funding solution for the entire mine.

Debt conversion reduces one immediate obligation

NexGen’s US$110 million of 2023 convertible debentures have now been converted into shares. A US$40 million portion was converted during September, and the remaining US$70 million was converted on October 22 after the reporting period, resulting in a further 10,355,029 shares for principal and 86,899 shares for accrued interest.

The conversion removes that debenture principal from the company’s obligations, but increases the equity base. NexGen reported 676.9 million shares at September 30 and 688.0 million shares outstanding as at November 9. The separate US$250 million 2024 debenture remains outstanding, with a maturity date in May 2029 and a 9% coupon.

Exploration continues alongside mine construction

Construction is not the only call on NexGen’s balance sheet. The company had drilled 28,712 metres of a planned 42,000-metre Patterson Corridor East program by September 30, with completion expected in early December, and had added a fifth rig after reporting early summer results. The program builds on the Patterson high-grade zone expansion, which earlier coverage described as showing expanded continuity and a new high-grade subdomain.

The next execution test is scheduled for the first quarter of 2027, when NexGen plans to begin temporary freezing and pre-sinking work for the production and exhaust shafts. The company also plans further major contract awards and continued site development. Whether construction remains on schedule and within the company’s evolving cost framework will matter more than the accounting loss in the next set of numbers.