Denison Announces Adoption of Indigenous Peoples Policy

Denison Mines Corp.

1100 – 40 University Ave

Toronto, ON M5J 1T1

www.denisonmines.com

PRESS RELEASE

DENISON ANNOUNCES ADOPTION OF

INDIGENOUS PEOPLES POLICY

Toronto, ON – Dec 2, 2021. Denison Mines Corp. (“Denison” or the “Company”) (DML: TSX, DNN: NYSE

American) is pleased to announce that its Board of Directors has approved the adoption of an Indigenous

Peoples Policy (the “ IPP”). The IPP reflects Denison’s recognition of the important role of Canadian

business in the process of reconciliation with Indigenous peoples in Canada and outlines the Company’s

commitment to take action towards advancing reconciliation.

Denison operates in various locations across Canada, on lands that are in the traditional territory of

Indigenous peoples , including its exploration and evaluation operations in Saskatchewan, which are in

regions covered by Treaty 6, Treaty 8 and Treaty 10 encompassing the traditional lands of the Cree, Dakota,

Déne, Lakota, Nakota, Saulteaux, and within the homeland of the Métis. As such, Denison's relations with

Indigenous People are unique and varied. Denison’s flagship Wheeler River Uranium Project is located

within the boundaries of Treaty 10, in the traditional territory of English River First Nation, and in the

homeland of the Métis.

David Cates, President & CEO of Denison, commented: “I believe Industry has an important role to

play in acknowledging, and building awareness of, the history of Indigenous people in Canada and

the critical importance of pursuing the objectives of reconciliation. As such, the adoption of an

Indigenous Peoples Policy is a notable step in our Company’s journey to bring reconciliation to the

forefront of what we do and how we do it. This policy is supported by our Board of Directors, on

behalf of Denison shareholders, and is welcome amongst all levels of staff within the organization

– from the executive team to operational personnel. We are pleased to formalize our Company’s

approach to Indigenous relations and commit to the development of a continuously evolving

Reconciliation Action Plan.”

The IPP was developed based on Denison’s experiences with, as well as feedback and guidance received

from, Indigenous communities with whom the Company is actively engaged. This approach was designed

to ensure the IPP appropriately captures a mutual vision for reconciliation. A copy of the IPP (available in

English, Frenc h, Cree and Déne languages), and other core corporate policies, are available on the

Corporate Governance page of Denison’s website (www.denisonmines.com).

Overview of Denison’s IPP

Denison’s IPP reflects the Company’s belief that reconciliation is advanced t hrough collaboration with

Indigenous peoples and communities to build long -lasting, respectful, trusting and mutually beneficial

relationships while aspiring to avoid adverse impacts of Denison’s activities and operations.

The IPP identifies 5 key areas of action that will support the ongoing development of a continuously evolving

Reconciliation Action Plan (“RAP”): Engagement; Empowerment; Environme nt; Employment; and

Education. Through the RAP, Denison is striving to interweave the principles of reconciliation throughout

all areas of the company’s operations.

In expressing the Company’s intentions in th e IPP, Denison carefully considered the standards and

principles articulated by The United Nations Declaration on the Rights of Indigenous Peoples and Call to

Action 92 (Business and Reconciliation) from Canada’s Truth and Reconciliation Commission (the “TRC”).

About Reconciliation in Canada

The TRC was established in 2008 and was mandated to reveal to Canadians the complex truth about the

history and the ongoing legacy of residential schools in a manner that fully documents the individual and

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collective harms against Indigenous peoples, and to guide and inspire a process of truth and healing,

leading toward reconciliation within Indigenous families, and between Indigenous peoples and non -

Indigenous communities, churches, governments, and Canadians generally.

As the TRC summarizes in its reports from 2015, the residential school system was “ part of a coherent

policy to eliminate Aboriginal people as distinct peoples and to assimilate them into the Canadian

mainstream against their will.” Opera ting over a period of almost 130 years, from 1870 to 1997 , th e

Government of Canada estimates that over 150,000 First Nation, Métis, and Inuit students passed through

the system.

Reconciliation is described by the TRC as “an ongoing individual and collective process of establishing and

maintaining respectful relationships … amongst First Nations, Inuit and Métis former Indian Residential

School students, their families, communities, religious entities, former school employees, government and

the people of Canada. ” Amongst many other things, the TRC notes that “a critical part of this process

involves repairing damaged trust by making apologies, providing individual and collective reparations, and

following through with concrete actions that demonstrate real societal change”.

In support of the reconciliation process, the TRC issued 94 Calls to Action – including, but not limited to,

those related to child welfare, education, language and culture, health, justice, the rights of Indigenous

peoples, missing children and burial information, commemoration, media, sport, and business.

More information about Canada’s Truth and Reconciliation Commission can be obtained from the

Government of Canada’s website (https://www.rcaanc-cirnac.gc.ca/eng/1450124405592/1529106060525)

and the website for the National Centre for Truth and Reconciliation (https://nctr.ca/).

About Denison

Denison is a uranium exploration and development company with interests focused in the Athabasca Basin

region of northern Saskatchewan, Canada. The Company has an effective 95% interest in its flagship

Wheeler River Uranium Project, which is the largest undeveloped uranium project in the infrastructure rich

eastern portion of the Athabasca Basin region of northern Saskatchewan. Denison's interests in

Saskatchewan also include a 22.5% ownership interest in the McClean Lake joint venture, which includes

several uranium deposits and the McClean Lake uranium mill that is contracted to process the ore from the

Cigar Lake mine under a toll milling agreement, plus a 25.17% interest in the Midwest Main and Midwest A

deposits, and a 66.90% interest in the Tthe Heldet h Túé (“THT,” formerly J Zone) and Huskie deposits on

the Waterbury Lake property. Each of Midwest Main, Midwest A, THT and Huskie are located within 20

kilometres of the McClean Lake mill.

Through its 50% ownership of JCU, Denison holds additional interests in various uranium project joint

ventures in Canada, including the Millennium project (JCU 30.099%), the Kiggavik project (JCU 33.8123%)

and Christie Lake (JCU 34.4508%).

Denison is also engaged in mine decommissioning and environmental services thr ough its Closed Mines

group, which manages Denison's Elliot Lake reclamation projects and provides post-closure mine care and

maintenance services to a variety of industry and government clients.

For more information, please contact

David Cates (416) 979-1991 ext 362

President and Chief Executive Officer

Shae Frosst (416) 979-1991 ext 228

Investor Relations

Follow Denison on Twitter @DenisonMinesCo

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Cautionary Statement Regarding Forward-Looking Statements

Certain information contained in this news release constitutes ‘forward-looking information’, within the meaning of the applicable United

States and Canadian legislation concerning the business, operations and financial performance and condition of Denison.

Generally, these forward-looking statements can be identified by the use of forward -looking terminology such as ‘plans’, ‘expects’,

‘budget’, ‘scheduled’, ‘estimates’, ‘forecasts’, ‘intends’, ‘anticipates’, or ‘believes’, or the negatives and/or variations of such words and

phrases, or state that certain actions, events or results ‘may’, ‘could’, ‘would’, ‘might’ or ‘will be taken’, ‘occur’, ‘be a chieved’ or ‘has

the potential to’. In particular, this news release contains forward-looking information pertaining to the IPP and Denison’s intentions

and expectations with respect thereto; and expectations regarding its joint venture ownership interests and the continuity of its

agreements with its partners.

Forward looking statements are based on the opinions and estimates of management as of the date such statements are made, and

they are subject to known and unknown risks, uncertainties and other factors that may cause the actual results, level of acti vity,

performance or achievements of Denison to be materia lly different from those expressed or implied by such forward -looking

statements. Denison believes that the expectations reflected in this forward-looking information are reasonable but no assurance can

be given that these expectations will prove to be acc urate and results may differ materially from those anticipated in this forward -

looking information. For a discussion in respect of risks and other factors that could influence forward-looking events, please refer to

the factors discussed in Denison’s Annua l Information Form dated March 26, 2021 under the heading ‘Risk Factors’. These factors

are not, and should not be construed as being exhaustive.

Accordingly, readers should not place undue reliance on forward -looking statements. The forward -looking information contained in

this news release is expressly qualified by this cautionary statement. Any forward-looking information and the assumptions made with

respect thereto speaks only as of the date of this news release. Denison does not undertake any obligation to publicly update or revise

any forward-looking information after the date of this news release to conform such information to actual results or to changes in

Denison's expectations except as otherwise required by applicable legislation.