Manufacturing Begins at Alta Mesa Uranium Undertaking, Texas

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June 15, 2024

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Denison carried out the Program in collaboration with Orano Canada Inc. (“Orano Canada”), as operator and proprietor of 74.83% of the Midwest Joint Enterprise (“MWJV”). Midwest is positioned roughly 25 kilometres, by current roads, from the Denison-Orano Canada owned McClean Lake Operation (see Determine 1), which is at present processing ore for the Cigar Lake mine below a toll milling settlement and has extra licensed processing capability. Orano Canada is a part of the Orano Group, which is acknowledged as a number one worldwide operator within the subject of nuclear supplies, with actions together with uranium mining, conversion, enrichment, and different gas companies.

David Cates , Denison’s President and Chief Govt Officer, commented ” Denison wish to thank Orano Canada for its help and encouragement of our joint efforts to guage the Midwest Essential deposit for potential future extraction by way of ISR mining. Orano has important international experience in ISR mining and Denison brings business management within the development of ISR mining within the Athabasca Basin area – permitting the three way partnership to assembl e a really robust crew to hold out and oversee this inaugural take a look at program.

The Program achieved its deliberate targets, and the outcomes present preliminary validation that the Midwest Essential deposit possesses the traits needed for a n ISR operation . Accordingly, additional analysis is warranted and , constructing on the Idea Research and incorporating the information acquired within the take a look at program, we’re continuing with a Preliminary Financial Evaluation (“PEA“) for ISR mining . Midwest characterize s Denison’s third challenge evaluated for potential ISR mining within the Athabasca Basin. ”

Highlights from the Program embody the next:

Affirm ed Hydraulic Conductivity : Pump and injection checks validated hydraulic connectivity within the take a look at wells throughout the mineralized zone and achieved hydraulic conductivity values (a measure of permeability) in step with the Idea Research. Ample permeability throughout the mineralized zone is a key criterion for the profitable deployment of the ISR mining technique.
Demonstrat ed the Effectiveness of Permeability Enhancement : One technique of permeability enhancement was efficiently deployed inside two wells, demonstrating the suitability of the strategy to the Midwest Essential deposit. Effectivity of permeability enhancement was verified by comparability of pre- and post-permeability enhancement hydraulic testing.
Metallurgical Samples Outlined and Collected for Leaching Traits : Core samples consultant of the Midwest deposit have been collected throughout the Program to be used in future metallurgical checks to find out the leaching traits.

202 4 ISR Discipline Take a look at Program

The 2024 ISR subject take a look at program was designed to validate varied deposit-specific traits of the Midwest Essential deposit, and to gather a database of geotechnical, hydrogeological, and metallurgical information to additional consider the ISR mining circumstances current on the deposit.

Ten small-diameter take a look at wells have been put in throughout the Midwest Essential deposit throughout the Program – together with a 4-well take a look at sample (the “Take a look at Sample”) and 6 particular person wells to check particular areas of the deposit for varied traits. The Take a look at Sample included one injection properly, one extraction properly, a recharge properly, and a monitoring properly outfitted with a multi-channel vibrating wire piezometer. The six further wells have been drilled to their goal depths and, as relevant, outfitted with properly screens and/or strain monitoring units to facilitate hydrogeological testing. All wells have been decommissioned at conclusion of the Program in step with regulatory commitments. See Figures 2 and 3 for an illustration of the properly areas throughout the northeast portion of the Midwest Essential deposit.

Core collected from the take a look at wells throughout the mineralized zone can be anticipated to be used to confirm and replace the present mineral useful resource estimate for the deposit and help future wellfield design and mineral processing assessments.

Profitable Completion of Hydrogeologic Take a look at Work

The Program included the completion of varied pump, injection, and packer checks designed to evaluate the permeability of the Midwest Essential deposit.

The take a look at program measured strain adjustments throughout the mineralized zone, which gives proof of the deposit’s hydraulic circumstances and is indicative of the potential for the motion of mining answer in an ISR mining operation. Ample permeability throughout the mineralized zone is a key criterion for the profitable deployment of the ISR mining technique.

The outcomes from the hydrogeological testing at Midwest Essential produced hydraulic conductivity values that are in step with these assumed within the Idea Research.

Further supportive take a look at work accomplished throughout the Program included permeability and porosity checks performed both downhole or on mineralized drill core recovered throughout the take a look at program.

Demonstration of the Effectiveness of Permeability Enhancement Methodology

One technique of permeability enhancement was efficiently evaluated on two take a look at wells throughout the mineralized zone, with efficacy verified by the comparability of pre- and post-permeability enhancement hydraulic conductivity checks. Permeability enhancement has been demonstrated to extend and normalize hydraulic conductivity within the space proximal to the wellbore, permitting for elevated contact of injected fluids throughout the mineralized zone so as to maximize uranium recoveries in an ISR mining surroundings.

Assortment of Different Supporting Datasets

Along with the checks described above, information and samples have been collected from the drill core recovered from the take a look at wells to facilitate: (1) the evaluation of matrix permeability, to tell an preliminary mannequin of the hydrogeological variations of the deposit; (2) geotechnical evaluations; (3) sediment evaluation utilizing Normal Penetration Take a look at (“SPT”) for measuring mud depths and the overburden under lake backside; and (4) testing of compressive and tensile energy for incorporation into future geotechnical assessments.

About Midwest

Midwest is located in the japanese portion of the Athabasca Basin area in northern Saskatchewan . The property is roughly one kilometre from the Factors North Touchdown airstrip and about 25 kilometres west, by current roads, from the McClean Lake M sick, which is collectively owned by Denison (22.5%) and Orano Canada (77.5%). Entry to Midwest is by each street and air. Items are transported to the location by truck over an all-weather street connecting with the provincial freeway system. Air transportation is offered by way of the Factors North airstrip (See Determine 1).

Preliminary exploration work at Midwest started in 1966, and Denison first turned an proprietor of the challenge in 1987. In 2007, Orano Canada accomplished an inner research evaluating the feasibility of mining the Midwest Essential deposit by way of open pit mining strategies with processing of the ensuing ore on the McClean Lake M sick. The MWJV subsequently superior the challenge by way of the environmental evaluation course of as an open pit mine and the ultimate model of the Midwest Undertaking Environmental Affect Assertion was authorised in September 2012.

The MWJV is at present evaluating the viability of quite a lot of potential choices for the longer term improvement of the Midwest Essential deposit, together with ISR. Even when a mining technique is chosen, any future improvement by the MWJV shall be topic to varied evaluation and approval processes, together with MWJV approval processes, provincial and federal regulatory evaluation, and engagement.

About Denison

Denison is a uranium mining, exploration and improvement firm with pursuits targeted within the Athabasca Basin area of northern Saskatchewan, Canada . Denison has an efficient 95% curiosity in its flagship Wheeler River Uranium Undertaking, which is the biggest undeveloped uranium challenge within the infrastructure wealthy japanese portion of the Athabasca Basin area of northern Saskatchewan . In mid-2023, the Phoenix Feasibility Research was accomplished for the Phoenix deposit as an ISR mining operation, and an replace to the beforehand ready 2018 Pre-Feasibility Research was accomplished for Wheeler River’s Gryphon deposit as a traditional underground mining operation. Based mostly on the respective research, each deposits have the potential to be aggressive with the bottom price uranium mining operations on the planet. Allowing efforts for the deliberate Phoenix ISR operation commenced in 2019 and have superior considerably, with licensing in progress and a draft Environmental Affect Research submitted for regulatory and public evaluation in October 2022 .

Denison’s pursuits in Saskatchewan additionally embody a 22.5% possession curiosity within the McClean Lake Joint Enterprise (“MLJV”), which incorporates unmined uranium deposits (deliberate for extraction by way of the MLJV’s SABRE mining technique beginning in 2025) and the McClean Lake uranium mill (at present using a portion of its licensed capability to course of the ore from the Cigar Lake mine below a toll milling settlement), plus a 25.17% curiosity within the MWJV’s Midwest Essential and Midwest A deposits, and a 69.35% curiosity within the Tthe Heldeth Túé (“THT”) and Huskie deposits on the Waterbury Lake Property. The Midwest Essential, Midwest A, THT and Huskie deposits are positioned inside 20 kilometres of the McClean Lake mill. Taken collectively, Denison has direct possession pursuits in properties protecting ~384,000 hectares within the Athabasca Basin area.

Moreover, by way of its 50% possession of JCU ( Canada ) Exploration Firm, Restricted (“JCU”), Denison holds further pursuits in varied uranium challenge joint ventures in Canada , together with the Millennium challenge (JCU, 30.099%), the Kiggavik challenge (JCU, 33.8118%), and Christie Lake (JCU, 34.4508%).

In 2024, Denison is celebrating its seventieth 12 months in uranium mining, exploration, and improvement, which started in 1954 with Denison’s first acquisition of mining claims within the Elliot Lake area of northern Ontario .

Certified Individuals

The disclosure of scientific or technical info contained on this launch has been reviewed and authorised, as relevant, by Mr. Chad Sorba, P.Geo., Denison’s Vice President, Technical Providers & Undertaking Analysis or Mr. Andrew Yackulic, P. Geo., Denison’s Vice President, Exploration, who’re Certified Individuals in accordance with the necessities of NI 43-101.

Cautionary Assertion Concerning Ahead-Wanting Statements

Sure info contained on this information launch constitutes ‘forward-looking info’, throughout the which means of the relevant United States and Canadian laws, regarding the enterprise, operations and monetary efficiency and situation of Denison. Usually, these forward-looking statements might be recognized by means of forward-looking terminology equivalent to ‘potential’, ‘plans’, ‘expects’, ‘funds’, ‘scheduled’, ‘estimates’, ‘forecasts’, ‘intends’, ‘anticipates’, or ‘believes’, or the negatives and/or variations of such phrases and phrases, or state that sure actions, occasions or outcomes ‘could’, ‘may’, ‘would’, ‘may’ or ‘will ‘ ‘ be taken’, ‘happen’ or ‘be achieved’.

Specifically, this information launch incorporates forward-looking info pertaining to the next: scope, targets and interpreted outcomes of the ISR take a look at program ; future plans and targets for Midwest , together with additional research, evaluation and a possible future useful resource estimate replace and PEA ; and expectations relating to its three way partnership possession pursuits and the continuity of its agreements with its companions and third events.

Ahead trying statements are based mostly on the opinions and estimates of administration as of the date such statements are made, and they’re topic to recognized and unknown dangers, uncertainties and different elements which will trigger the precise outcomes, degree of exercise, efficiency or achievements of Denison to be materially totally different from these expressed or implied by such forward-looking statements. For instance, the modelling and assumptions upon which the plans for Midwest are based mostly might not be maintained after additional work is accomplished. As well as, Denison could determine or in any other case be required to discontinue testing, analysis and different work whether it is unable to keep up or in any other case safe the mandatory assets (equivalent to testing amenities, capital funding, three way partnership app r ovals, regulatory approvals, and so on.). Denison believes that the expectations mirrored on this forward-looking info are cheap however no assurance might be provided that these expectations will show to be correct and outcomes could differ materially from these anticipated on this forward-looking info. For a dialogue in respect of dangers and different elements that might affect forward-looking occasions, please check with the elements mentioned in Denison’s Annual Data Type dated March 2 8 , 202 4 or subsequent quarterly monetary studies below the heading ‘Danger Elements’. These elements will not be, and shouldn’t be construed as being , exhaustive.

Accordingly, readers mustn’t place undue reliance on forward-looking statements. The forward-looking info contained on this information launch is expressly certified by this cautionary assertion. Any forward-looking info and the assumptions made with respect thereto speaks solely as of the date of this information launch. Denison doesn’t undertake any obligation to publicly replace or revise any forward-looking info after the date of this information launch to adapt such info to precise outcomes or to adjustments in Denison’s expectations besides as in any other case required by relevant laws.