Mr. Sheriff, as the founder and Executive Chair, has advanced the company from inception to a uranium producer with a multi-jurisdictional United States asset base. Mr. Sheriff has raised over $600 MM in the public markets and has extensive experience in mergers and acquisitions.
Mr. Sheriff is an entrepreneur and visionary with over 40 years of experience in the minerals industry and the securities industry and has been responsible for significant capital raises along with corporate development. Mr. Sheriff was a pioneer in the uranium renaissance as co-founder and Chairman of Energy Metals Corp. and was responsible for compiling the largest domestic uranium resource base in U.S. history before the company was sold for $1.8 billion in 2007. With his in-depth understanding of the nuclear industry and market conditions, plus his knowledge of the financial markets, Mr. Sheriff is regarded as a leader and avid supporter of nuclear energy as a clean and reliable energy source for the United States.
Mr. Sheriff also has a significant interest in the gold exploration sector with personal and corporate gold exploration assets across the United States and Canada. He is a Director and co-founder of Group 11 Technologies Inc.; a private company committed to the development and application of environmentally and socially responsible metals mineral extraction as an alternative to conventional mining methods. Mr. Sheriff holds a B.Sc. degree (Geology) from Fort Lewis College, Colorado and an MSc in Mining Geology from the University of Texas-El Paso. He has compiled one of the largest privately-held mining databases in the world, providing enCore with access to certain proprietary uranium data.
Mr. Pelizza has spent 45 years in the uranium industry with project experience including the Alta Mesa, Benavides, Kingsville Dome, Longoria, Palangana, Rosita, West Cole and the Vasquez projects, all in Texas.
He was also responsible for the permitting and licensing of the Church Rock, Crownpoint, and Unit 1 projects in New Mexico and the North Platte project in Wyoming. Currently, Mr. Pelizza is the Principal of M.S. Pelizza & Associates LLC, where he represents extractive industry clients. He previously served as Sr. Vice President of Health, Safety and Environmental Affairs with Uranium Resources, Inc. He has also previously worked with Union Carbide Corp. Mr. Pelizza received his B.S. in Geology from Fort Lewis College and his M.S. in Geological Engineering from the Colorado School of Mines. He is a licensed Professional Geoscientist in Texas and a Certified Professional Geologist with the American Institute of Professional Geologists. He is the Past Chairman of the Texas Mining and Reclamation Association and the Past Chairman of the Uranium Producers of America.
Mr. Harris is a partner in Solo Management Group, LLC, an investment and management consulting partnership.
He was previously a board member of Energy Metals Corporation, Chairman and Executive Committee member of the American Fiber Manufacturers Association, and President and Chief Executive Officer of Hoechst Fibers Worldwide, the global acetate and polyester business of Hoechst AG. At Hoechst Fibers Worldwide, Mr. Harris managed the business’ $5 billion operation, comprised of 21,000 employees and production locations in 14 different countries. Harris is currently a Director of Scandium International Mining Corp. Mr. Harris is a graduate of Harvard College, BA in English, and Columbia University Graduate School of Business, MBA in finance.
Mr. Tewalt is an economic geologist with over 40 years of experience in the uranium, precious metals, and base metals industries. After beginning his career as an exploration geologist working throughout the western U.S., he transitioned to founding and managing Canadian public companies. In 2003, anticipating a rise in uranium prices, Mr. Tewalt formed a private company to assemble uranium resource properties in the southwestern U.S., which became Standard Uranium in 2004. As the uranium market strengthened, he led the company’s shift from exploration to production through the acquisition of the Palangana deposit and Hobson processing plant in South Texas, and brought on ISR pioneer Dr. Dennis Stover to lead operations.
Following the acquisition, Mr. Tewalt worked with Energy Metals founder William Sheriff to merge the two companies in 2006, creating a stronger producer-focused platform. Energy Metals was acquired by Uranium One in 2007 in a $1.8 billion transaction, generating returns of up to 2600% for early Standard Uranium investors. Between 2007–2012, Mr. Tewalt focused on precious metals companies before reuniting with Mr. Sheriff to transition Wolfpack Gold into Tigris Uranium, anticipating the next uranium cycle. Tigris assets later formed the foundation for enCore Energy Corp where Mr. Tewalt served as a Director from 2017 to 2022.
Mr. Tewalt has been involved in precious and base metal discoveries throughout his career, including Rock Lake (Montanore, Montana, 1984), Lincoln Mine and satellite discoveries (California’s Mother Lode, 1988–1990), Storm (Carlin Trend, Nevada, 1994), Hollister (Northern Nevada Rift, Nevada, 1998), and Cordero (Gallium resource, 2001). He has served as President and CEO of Great Basin Gold, Standard Uranium, Colombian Mines, Nevgold Resources, Wolfpack Gold, and Silver Predator. He is currently Chairman of Silver Predator Corp. and co-owner of Troy Resources LLC.
Mr. Heili is a metallurgical engineer specializing in uranium recovery throughout his 35+ year professional career. Starting out in South Texas and later moving to Wyoming, Mr. Heili has held technical, managerial and senior executive roles in both major corporate and junior development uranium production companies. He served as Vice President of Mining and later as Chief Executive Officer of Ur-Energy Inc. as it advanced projects from conception to production. Mr. Heili most recently served as the Chief Executive Officer of Peninsula Energy Limited as it successfully overcame a number of challenges in bringing the Lance Project in Wyoming to production status in 2025.
In a corporate capacity, Mr. Heili has successfully led teams charged with new project development, regulatory affairs, uranium marketing and investor relations campaigns. He served as an Executive Director of both Ur-Energy Inc. and Peninsula Energy Limited as well as holding Board of Directors position with the Uranium Producers of America, the Wyoming Mining Association and numerous community non-profit organizations.