Denison Mines

As a result of IFRS 18, amendments to IAS 7 were also issued to require that entities use the operating profit subtotal as the starting point for the indirect method of reporting cash flows from operating activities and also to remove presentation alternatives for interest and dividends paid and received.

SEC original ↗Denison Mines — Earnings release (6-K exhibit)EX-99Aug 14, 2026

Upon the occurrence of specified corporate transactions, such as a change of control, major corporate transaction, or liquidation, the Company must offer to repurchase all or part of the outstanding Notes for cash.

SEC original ↗Denison Mines — Earnings release (6-K exhibit)EX-99Aug 14, 2026

Any Notes not converted, repurchased or redeemed prior to the maturity date will have their principal amount repaid by Denison in cash at maturity.

SEC original ↗Denison Mines — Earnings release (6-K exhibit)EX-99Aug 14, 2026

  Applicable borrowing costs are capitalized to qualifying assets and are included in assets under construction.

SEC original ↗Denison Mines — Earnings release (6-K exhibit)EX-99Aug 14, 2026

Borrowing costs attributable to the acquisition, construction or production of qualifying assets are added to the cost of those assets until such time as the assets are substantially ready for their intended use.

SEC original ↗Denison Mines — Earnings release (6-K exhibit)EX-99Aug 14, 2026

(“F3”) in the form of convertible debt instruments.

SEC original ↗Denison Mines — Earnings release (6-K exhibit)EX-99Aug 14, 2026

(“DMC”) and its subsidiary companies and joint arrangements (collectively, “Denison” or the “Company”) are engaged in uranium mining related activities, which can include acquisition, exploration, development and mining of uranium bearing properties, as well as the processing and selling of, and investing in, uranium.

SEC original ↗Denison Mines — Earnings release (6-K exhibit)EX-99Aug 14, 2026

Consistent with this strategy, during the second quarter, Denison sold 750,000 pounds U 3 O 8 at an average realized price of $122.16 (US$89.17) per pound U 3 O 8 to generate $91.6 million (US$66.9 million) in gross proceeds – representing a gain of $64.1 million (or 233%) from the original purchase price.

SEC original ↗Denison Mines — Earnings release (6-K exhibit)EX-99Aug 14, 2026

  Metallurgical Testing   During the second quarter of 2026, the Phoenix metallurgical test program continued at the Saskatchewan Research Council (‘SRC’) laboratory facilities in Saskatoon, including a hybrid core leach test which will provide additional information for both leaching and remediation of the Phoenix deposit, as well as other test work focused on process circuit testing to optimize performance.

SEC original ↗Denison Mines — Earnings release (6-K exhibit)EX-99Aug 14, 2026

  The decrease in evaluation expenditures for pipeline properties in the three and six month periods ended June 30, 2026, as compared to the prior year period, is primarily due to field activities at THT East Pod and Waterbury undertaken in 2025 while activities in 2026 have focused on metallurgical testing and progression of the PFS for the KLP project.

SEC original ↗Denison Mines — Earnings release (6-K exhibit)EX-99Aug 14, 2026

The program is focused on exploration targets situated close to infrastructure currently under construction at Phoenix and/or potential future infrastructure for the Gryphon project.

SEC original ↗Denison Mines — Earnings release (6-K exhibit)EX-99Aug 14, 2026