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DENISON MINES CORP.

TSX:DMLLSE:0URYUS:DNN
C$3.66Close 7 Oct 2026 · delayed

Past year: ▼ 18%(3.60 – 5.68 CAD)

Market cap
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Story beats
38 since 2000
Last event
10 Oct 2025

Announcements, explained

Each one in plain English, with the numbers worked through for a shareholder.

10 Oct 2025resource reserve update▲ GoodMajor

An economic assessment of the Midwest deposit by in-situ recovery, effective 6 August 2025: on a whole-project basis and at US$80 a pound uranium, an after-tax value of C$964 million at an 8% discount, an 82.7% return and payback inside a year. Midwest was a conventional open-pit project for decades; the in-situ method is what makes it look like this.

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10 Aug 2023resource reserve update▲ GoodMajor

The Wheeler River technical report effective 23 June 2023 puts the Phoenix in-situ recovery project at an after-tax value of $1.43 billion at an 8% discount, an 82.3% return and an eleven-month payback - a step up from the 2018 pre-feasibility figures, driven by the in-situ recovery design and higher uranium prices.

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27 Mar 2023resource reserve update● Neutral

Filed the technical report for the Christie Lake uranium project, effective 31 December 2021, prepared for UEX Corporation and JCU (Canada) Exploration, which hold 50% each. Denison's exposure runs through its interest in JCU, the same third partner that held a right of first refusal over Cameco's Wheeler River stake in 2018.

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31 Dec 2020resource reserve update▲ GoodMajor

An economic assessment of the Tthe Heldeth Tue (J Zone) deposit at Waterbury Lake, effective 30 October 2020, using in-situ recovery: base case pre-tax value of $177.3 million at an 8% discount, a 39.1% return and payback in about 22 months. At $35 a pound uranium the same project is worth $38.3 million and returns 17.4% - the study's own low case shows how much of the value is the uranium price.

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2 Nov 2018resource reserve update▲ GoodMajor

Filed the pre-feasibility study for the now 90%-owned Wheeler River: 109.4 million lb of uranium oxide over a 14-year life, pre-tax net present value of $1.31 billion at an 8% discount, a 38.7% return and $322.5 million of initial capital. Phoenix would be mined by in-situ recovery with its own on-site plant; Gryphon underground, processed at the McClean Lake mill Denison part-owns.

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28 Mar 2018resource reserve update● Neutral

An updated resource for the Midwest property, audited by SRK: indicated rose to 1,019,000 tonnes at 2.26% uranium oxide for 50.78 million lb, from 818,000 tonnes at 2.70% for 48.70 million lb - 25% more tonnes at a 16% lower grade for 4% more metal. Inferred moved from 34,000 tonnes at 6.30% to 845,000 tonnes at 0.98%, taking contained metal from 4.70 to 18.21 million lb.

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7 June 2017drilling scheduled● Neutral

Planned 18,000 metres in about 40 holes over the summer, all at Gryphon, with 18 of them infill drilling meant to lift the inferred resource to indicated confidence - the drilling a pre-feasibility study needs.

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30 May 2017drilling result▲ GoodMajor

Chemical assays came back 45% above the radiometric probe estimates released during the winter programme, and delivered the best D-lens result to date. Denison's practice of publishing probe numbers first understated these holes.

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21 Apr 2017drilling result▲ GoodMajor

Reported 22.1 metres of high-grade mineralization from the Gryphon D lenses as winter drilling ended, still outside the 2015 resource estimate.

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30 Mar 2017drilling result▲ GoodMajor

Multiple high-grade intercepts in the D series of lenses, which lie outside the existing Gryphon resource, from a 16,000-metre winter programme aimed at making the deposit both bigger and better defined.

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18 May 2016resource reserve update● Neutral

Filed the technical report behind the Wheeler River economic assessment, effective 31 March 2016.

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21 Apr 2016drilling result● Neutral

Reported winter drilling on the wider exploration portfolio - more than 340,000 hectares in the eastern Athabasca Basin outside Wheeler River - with mineralization intersected on several properties.

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19 Apr 2016drilling result▲ Good

Finished the winter programme with 21,800 metres in 32 holes at Wheeler River and expanded the mineralized zone found immediately north of Gryphon.

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5 Apr 2016resource reserve update▲ GoodMajor

The first economic study of Wheeler River: a base-case pre-tax return of 20.4% at the then long-term uranium contract price, with Denison's 60% share of initial capital put at C$336 million out of C$560 million for the whole project.

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10 Mar 2016drilling result▲ GoodMajor

WR-641, 160 metres northwest of Gryphon, returned 3.9% uranium oxide over 9.2 metres including 6.7% over 5.3 metres. These are radiometric probe estimates awaiting chemical assay.

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12 Feb 2016drilling result▲ GoodMajor

WR-633D1, 100 metres north of Gryphon, cut about 11 metres of basement-hosted mineralization including 5.7% uranium oxide over 1.0 metre and 6.3% over 1.7 metres - the deposit is not closed off to the north.

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18 Dec 2015resource reserve update● Neutral

The independent technical report covering both Wheeler River deposits after the Gryphon estimate, prepared by Roscoe Postle Associates and effective 25 November 2015.

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3 Nov 2015resource reserve update▲ GoodMajor

The first resource estimate for Gryphon added 43.0 million lb of inferred uranium oxide to Wheeler River, alongside Phoenix's 70.2 million lb indicated. Eighteen months after the discovery hole, Wheeler River holds two deposits instead of one.

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23 Oct 2015drilling result▲ Good

Completed the 2015 summer programme: 24,468 metres in 34 holes at Wheeler River, expanding Gryphon and adding a new zone at Murphy Lake.

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30 July 2015drilling result▲ Good

Finished definition drilling at Gryphon just over a year after discovering it, and found uranium mineralization at Murphy Lake.

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14 July 2014resource reserve update● Neutral

The independent technical report supporting the 70.2 million lb Phoenix estimate.

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19 June 2014resource reserve update▲ GoodMajor

Phoenix passed 70 million lb: indicated resources rose from 52.3 to 70.2 million lb of uranium oxide on 166,400 tonnes, after 25 holes drilled since the 2012 estimate to convert inferred material and extend the higher-grade parts.

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7 Apr 2014drilling result▲ GoodMajor

The first follow-up hole at Gryphon, WR-560, returned 17.3% uranium oxide over 4.2 metres, confirming the discovery two weeks after it was announced. The same filing carries the annual meeting circular and the chairman's letter to shareholders.

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4 Apr 2014drilling result▲ GoodMajor

A new discovery: WR-556, 3 km northwest of Phoenix at the K North target, cut 9.7% uranium oxide over 4.6 metres in the basement rock. The zone was named Gryphon and became the second deposit at Wheeler River.

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28 Feb 2014drilling result▲ GoodMajor

High-grade intersections at Zone A of Phoenix, best of them 29.6% uranium oxide over 6.5 metres in WR-548. The release sets out the ownership that mattered for the next five years: Denison operator with 60%, Cameco 30% and JCU 10%.

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23 Dec 2013farm in farm out agreement● Neutral

Optioned the Jasper Lake property - 18 claims over 45,271 hectares, 40 km east of the Cigar Lake mine - to Strateco Resources, which can earn up to 60% by funding work. Denison keeps its ground working without spending its own money.

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18 Sept 2013resource reserve update● Neutral

The independent technical report on the Mutanga project in Zambia - the last substantial disclosure on the African assets before they were sold.

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17 Sept 2013resource reserve update● Neutral

The independent technical report on the J Zone uranium deposit at Waterbury Lake, the main asset acquired with Fission Energy.

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18 Jan 2013resource reserve update● Neutral

The independent technical report behind the Phoenix estimate, prepared by Roscoe Postle Associates and effective 31 December 2012.

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16 Jan 2013resource reserve update▲ GoodMajor

First resource estimate for the Phoenix A and B deposits at Wheeler River: 52.3 million lb of uranium oxide indicated, from just 152,400 tonnes at 15.6% uranium oxide, plus 7.6 million lb inferred from 11,600 tonnes at 29.8%. Very small tonnages at extraordinary grades.

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