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Denison Mines Corp (DML.TO)

DML.TO on Toronto Stock Exchange

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Summary

Name Age Since Current Position

Catherine Stefan

65 2018 Non-Executive Chairman of the Board

David Cates

2018 President, Chief Executive Officer, Director

Gabriel McDonald

2015 Chief Financial Officer, Vice President - Finance

Michael Schoonderwoerd

2013 Vice President, Controller

Timothy Gabruch

2018 Vice President - Commercial

Peter Longo

2014 Vice President - Project Development

Dale Verran

2016 Vice President - Exploration

Amanda Willett

2016 Corporate Counsel, Corporate Secretary

Ronald Hochstein

56 2015 Director

Jack Lundin

2018 Director

Moo Hwan Seo

2018 Director

Patricia Volker

2018 Director

W. Robert Dengler

77 2006 Independent Director

Brian Edgar

68 2005 Independent Director

William Rand

76 1997 Independent Director

Sophia Shane

IR Contact Officer

Biographies

Name Description

Catherine Stefan

Ms. Catherine J. G. Stefan is Non-Executive Chairman of the Board of Denison Mines Corporation. Ms. Stefan is currently engaged as a Corporate Director. Until 2016, she was President of Stefan & Associates, a consulting firm. Ms. Stefan served as Chief Operating Officer of O&Y Properties Inc. from 1996 to 1998. From 1999 until 2008, Ms. Stefan was Managing Partner of Tivona Capital Corporation, a private investment firm. Ms. Stefan obtained her Bachelor of Commerce degree from the University of Toronto in 1973. Ms. Stefan is a Chartered Professional Accountant (CPA, CA) and a member of the Institute of Corporate Directors and Women in Mining, with over 30 years of business experience, primarily in senior management of public companies in the real estate sector. Ms. Stefan’s mining experience includes her involvement with Denison and as a Director of Lundin Mining Corporation since 2015. Ms. Stefan is also a director of Lundin Mining Corporation (TSX, Nasdaq Stockholm).

David Cates

Mr. David Daniel Cates serves as President, Chief Executive Officer, Director of the Company. Mr. Cates joined Denison in 2008 and held the position of Director, Taxation until his appointment. Prior to joining the Company, Mr. Cates held positions at Kinross Gold Corp. and PwC LLP with a focus on taxation and accounting in the resource industry. Mr. Cates is a Chartered Accountant, has completed Part I, II, and III of the CICAIn-depth Tax Course, and holds Master of Accounting (MAcc) and Honours Bachelor of Arts (BA) degrees from the University of Waterloo.

Gabriel McDonald

Mr. Gabriel Ernst McDonald is Chief Financial Officer, Vice President - Finance of Denison Mines Corp., He was Director of Financial Reporting at IAMGOLD Corporation from 2015, Senior Manager at PricewaterhouseCoopers LLP from 2008.

Michael Schoonderwoerd

Mr. Michael Schoonderwoerd is a Vice President, Controller of Denison Mines Corp. He has been Vice President, Controller since 2013; prior, Corporate Controller, 2004 to 2012.

Timothy Gabruch

Mr. Timothy Gabruch is Vice President - Commercial of the Company. Tim has nearly two and a half decades of experience in the uranium mining and nuclear energy industries, having spent 23 years with Cameco Corporation ("Cameco") in various marketing and corporate development roles. He served as Vice President Marketing, from 2011 to 2017, leading a diverse team responsible for strategy development, sales and marketing, administration, and inventory and logistics management - resulting in the successful delivery of more than 30 million pounds U 3 O 8 annually. Through his career, Tim has worked directly with nuclear utilities from around the world, including having spent 8 years at Cameco's previous marketing and sales subsidiary inMinneapolis, USA. Tim also has experience serving the World Nuclear Association's predecessor organization, the Uranium Institute, during a secondment, and as a board member of the Saskatchewan Trade and Export Partnership (STEP), a joint government/private non-profit organization that champions the province's export industry.

Peter Longo

Mr. Peter Longo, P.Eng., MBA, PMP, is Vice President - Project Development of the Company. He was Vice-President, Operations, Claude Resources Inc., a gold mining company from 2011- 2014; prior Project Manager, AREVA Resources Inc. from 2007-2011.

Dale Verran

Mr. Dale Verran is Vice President - Exploration of the Company since January 2016. Prior, he was Technical Director, Exploration since 2013, Technical Director, Remote Exploration Services from 2005 to 2013 and Exploration Manager, Manica Minerals Limited from 2010 to 2013.

Amanda Willett

Ms. Amanda Willett is Corporate Counsel, Corporate Secretary of the Company. She has been Corporate Counsel and Corporate Secretary since June 2016; prior: Senior Associate at Blake, Cassels & Graydon LLP in Vancouver since 2011, Associate at Stikeman Elliott LLP in Toronto since 2008.

Ronald Hochstein

Mr. Ronald F. Hochstein is Director of the Company. Mr. Hochstein is currently the President and Chief Executive Officer of Lundin Gold Inc. Mr. Hochstein served as Executive Chairman of the Company in 2015 and as President and Chief Executive Officer from 2009 to 2015. Prior to that, Mr. Hochstein served as President and Chief Operating Officer starting in 2006 when International Uranium Corporation (“IUC”) and Denison Mines Inc. (“DMI”) combined to form the Company. Before then, Mr. Hochstein served as President and Chief Executive Officer of IUC. Mr. Hochstein joined the Company in October 1999 as Vice-President, Corporate Development and later served as Vice- President and Chief Operating Officer, prior to his appointment as President and Chief Executive Officer in April 2000. Prior to joining the Company, Mr. Hochstein was a Project Manager with Simons Mining Group and was with Noranda Minerals as a metallurgical engineer. Mr. Hochstein is a Professional Engineer and holds an M.B.A. from the University of British Columbia and a B.Sc. from the University of Alberta. Mr. Hochstein1 is also a director of Lundin Gold Inc. (TSX, Nasdaq Stockholm) and Sprott Resources Holdings Inc. (TSX).

Jack Lundin

Mr. Jack Oliver Lundin is Director of the company. He has been involved in the natural resource industry his entire life through exposure to the various Lundin Group companies and mentorship under Messrs. Lukas, Ian and the lateAdolf Lundin. He began his career in the sector working prospecting jobs and as a field technician on projects around the world. Since 2016, Mr. Lundin has been employed with Lundin Gold Inc. (TSX: LUG), and currently holds the position of Senior Mine Project Engineer, working on the construction of the Fruta del Norte gold project in Ecuador. Mr. Lundin received a Bachelor of Science degree in Business Administration from Chapman University, and a Master of Engineering degree in Mineral Resource Engineering from the University of Arizona. Mr. Lundin also sits on the board of directors of NGEx Resources Inc. (TSX: NGQ).

Moo Hwan Seo

Mr. Moo Hwan Seo is Director of the company. He is currently General Manager of the Global Business Division in the Global Nuclear Business Department at Korea Hydro Nuclear Power ("KHNP"), a subsidiary of the Korea Electric Power Corporation ("KEPCO"), with responsibility for coordinating KHNP's overseas nuclear power plant business. Mr. Seo started his career with KEPCO in 1992, and has held a variety of senior positions involved in the commissioning of the Hanul and Shin-Hanul nuclear power plants and both the Overseas Nuclear Business Team and International Cooperation Team. Mr. Seo has a Bachelor of Metallurgical Engineering from Young Nam University. Under the terms of the amended and restated strategic relationship agreement between Denison and KHNP,

Patricia Volker

Ms. Patricia Mary Volker is Director of the company. Volker's experience is highlighted by over ten years of experience with the Chartered Professional Accountants ofOntario, the self-regulating body forOntario'sChartered Professional Accountants, including the role of Director of Standards Enforcement and the role of Director, Public Accounting, which she held until her retirement onDecember 31, 2015. Ms. Volker served in various capacities in the accounting profession during her 30+ year career, and brings a wealth of advisory, public accounting, banking, and regulatory expertise to the Denison Board. Ms. Volker also sits on the board and chairs the audit committee of Labrador Iron Ore Royalty Corporation (TSX: LIF), as well as serves on the boards of other private company and organization boards, including the volunteer board of directors of Ornge. Ms. Volker is a Chartered Professional Accountant (CPA, CA, CMA) and holds a B.Sc. from the University of Toronto.

W. Robert Dengler

Mr. W. Robert Dengler is Independent Director of Denison Mines Corporation since December 1, 2006. Mr. Dengler is currently engaged as a Corporate Director. In 2006, Mr. Dengler retired from his position as Non-Executive Vice-Chairman of Dynatec Corporation. Until January 2005, Mr. Dengler served as President and Chief Executive Officer of Dynatec Corporation, a position which he held for 25 years. Before founding Dynatec, Mr. Dengler was a partner and Vice-President & General Manager of J.S. Redpath Limited. Mr. Dengler has more than 40 years of management experience. Mr. Dengler obtained his B.Sc. from Queen’s University in 1964.

Brian Edgar

Mr. Brian D. Edgar is Independent Director of Denison Mines Corporation., since March 22, 2005. Mr. Edgar is the Chairman of Silver Bull Resources Inc. (“Silver Bull”), a mineral exploration company listed on the TSX and the OTCMKTS. He also serves as President and Chief Executive Officer of Dome Ventures Corporation, a whollyowned subsidiary of Silver Bull. Prior to joining Silver Bull in 2012, Mr. Edgar worked as a director at Rand Edgar Capital Corp. (now Rand Edgar Investment Corp.), a private investment company established in 1992 by Messrs. Rand and Edgar. Mr. Edgar practiced corporate and securities law for 16 years. Mr. Edgar is also a director of Silver Bull (TSX and OTCMKTS), BlackPearl Resources Inc. (TSX, Nasdaq Stockholm), Lucara Diamond Corp. (TSX, Nasdaq Stockholm), and ShaMaran Petroleum Corp. (TSX-V, Nasdaq Stockholm).

William Rand

Mr. William A. Rand is Independent Director of Denison Mines Corporation., since May 9, 1997. Mr. Rand is the President and a director of Rand Investments Ltd., a private investment company. Previously, Mr. Rand practiced corporate/securities law for nearly 25 years before retiring from the practice of law in 1992 to establish his investment company. Mr. Rand received a Bachelor of Commerce degree (Honours Economics) from McGill University, a law degree from Dalhousie University, a Master of Laws degree in international law from the London School of Economics and a Doctor of Laws honoris causa from Dalhousie University. Mr. Rand is also a director of Lundin Mining Corporation (TSX, Nasdaq Stockholm), New West Energy Services Inc. (TSX-V) and NGEx Resources Inc. (TSX, Nasdaq Stockholm).

Sophia Shane