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NexGen Energy Ltd.

For the period ended Dec 31, 2024. Filed Mar 4, 2025.

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The yearly report of certain Canadian companies, filed under a joint US and Canadian system. It is the main yearly account these companies give US investors, largely as filed in Canada.

FY2024 · Filed Mar 4, 2025

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NXE$8.25+4.0%Stored close · as of Nov 6, 2026
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Contents

EX-99.1 · Notes:

**Notes: **

1.The base case scenario from the Rook I FS Technical Report uses a discount rate of 8%. Free Cash Flow represents the after-tax net cash flow from the Rook I Project, determined in accordance with the Rook I FS Technical Report. It assumes that 100% of uranium produced from the Rook I Project can be sold at a long-term price of US$50/lb U3O8 at an exchange rate of C$/US$ of 1.00:0.75.
2.The Updated Cost Estimate reflects an internal assessment of expected CAPEX and OPEX as at the date thereof, as well as other Rook I Project costs, including estimated sustaining capital, royalties, and taxes.
3.As noted in the Rook I FS Technical Report, NPV, and IRR are most sensitive to metal prices, grade, metal recovery, and exchange rates. To demonstrate the sensitivities of NPV and IRR to uranium prices, alternatives to the uranium price assumption of US$50/lb U3O8 used for the base case scenario in the Rook I FS Technical Report, as well as ranges for sensitivities beyond those noted in Figure 1-3 in the Rook I FS Technical

Report, are shown for illustrative purposes. Readers are cautioned that such information may not be appropriate for other purposes, including an assessment of expected Project economics, and that such prices do not represent forecasts of expected uranium prices or prices at which uranium produced from the Rook I Project can be sold.

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