HOW Denison Mines (TSX:DML) and Energy Fuels (TSX:EFR) Offer Different Routes to Uranium Supply in the S&P/TSX Composite Energy Sector

Two Very Different Paths to Yellowcake

Denison Mines and Energy Fuels are both uranium stocks in the energy sector of the S&P/TSX Composite Index, and both are also listed in New York. They answer the same question, how to get more uranium to nuclear utilities, in very different ways.

Denison's route is to build something new. Its Phoenix project on the Wheeler River property, in which it holds an effective 95% interest, will use in-situ recovery (ISR). Instead of digging ore out, ISR pumps a solution through wells into the orebody, dissolves the uranium underground and brings the uranium-bearing liquid to surface for processing. At Phoenix, a freeze wall will surround the deposit to contain that solution. Denison calls it the first new large-scale Canadian uranium mine in more than two decades.

Energy Fuels' route is to use existing American infrastructure. It owns the White Mesa Mill in Utah, which it describes as the only fully licensed conventional uranium mill operating in the US, and feeds it with ore from its Pinyon Plain mine in Arizona and its La Sal and Pandora mines in Utah. It is already producing, but it is also turning White Mesa into a rare earth processing hub, so uranium is only part of its story.

Denison: Building Phoenix, Funded by Its Own Stockpile

Denison's (TSX:DML) board made a final Investment decision on Phoenix on 24 February 2026, after the project received its federal environmental assessment approval and construction licence earlier that month. Site work began in March, and full-scale construction followed in the summer. By the end of July, more than 20% of overall site civil work was complete, a temporary camp had lifted on-site accommodation to nearly 400 people, and installation of the freeze wall had begun. First production is targeted for mid-2028 after a construction period of about two years.

In January 2026 Denison raised its estimate of initial Capital to about C$600 million, which it said was 20% higher than the 2023 feasibility study after adjusting for inflation. The attraction is grade: the high-grade domain of Phoenix's Zone A is estimated to hold 56.3 million pounds of U3O8 (uranium concentrate) in measured and indicated resources at an average grade of 46.0%, extraordinarily rich by global standards. The company expects Phoenix to be among the lowest-cost uranium mines in the world.

Denison (TSX:DML) is paying for construction partly by selling the 2.5 million pounds of physical uranium it bought in 2021 at an average of C$36.67 (US$29.66) per pound. In the second quarter of 2026 it sold 750,000 pounds at an average of C$122.16 (US$89.17) per pound, raising C$91.6 million and locking in a C$64.1 million gain without issuing new shares. At 30 June it still held about 1.1 million pounds, with 600,000 pounds committed for delivery by mid-2027. With its first-quarter results it reported firm sales commitments for nearly 8 million pounds of uranium, including future Phoenix output, and was negotiating a similar amount more. In 2025 it raised US$345 million through convertible notes, and it holds a 22.5% stake in the McClean Lake joint venture, where Mining restarted in 2025.

Energy Fuels (TSX:EFR): Producing Now, Pivoting to Rare Earths

Energy Fuels (TSX:EFR) reached its full-year uranium target by the middle of 2026. It produced 865,000 pounds of finished U3O8 in the second quarter and 1.7 million pounds in the first half, already inside its 2026 guidance of 1.5 million to 2.5 million pounds. The company reported a total cost of about US$23 per pound for Pinyon Plain ore processed in the recent mill run, which it believes ranks among the lowest for mined uranium anywhere.

Its approach is flexible. White Mesa processes stockpiled ore in campaigns rather than continuously, and the next uranium run is planned for late 2026 or early 2027. In the second quarter it sold 310,000 pounds at an average of US$80.48 per pound for US$25.0 million of revenue, but posted a net loss of US$33.6 million, mainly because of Acquisition costs.

Those acquisitions show where Energy Fuels is heading. It completed its purchase of Australian Strategic Materials on 28 August 2026, agreed in June to buy German magnet maker Vacuumschmelze (VAC) for about US$1.9 billion in cash and stock, and received a conditional US$725 million Loan Commitment from the US Office of Strategic Capital. Construction began in July on a White Mesa expansion to produce "heavy" rare earth oxides such as terbium and dysprosium by the end of 2027. It also holds a 12.7% stake in the Donald mineral sands project in Australia, with the right to earn up to 49% and take all of its monazite (rare-earth-bearing sand) output. At 30 June it had US$996.0 million of working capital, largely in marketable securities.

Side by Side

What Could Go Wrong

Each route carries its own risks. Denison is running a first-of-its-kind ISR operation in the Athabasca Basin, so technical surprises, cost overruns or delays to the mid-2028 start would hit a company that has no large production today. Its capital estimate has already risen once.

Energy Fuels' uranium output is modest, intermittent and depends on mill campaigns and ore grades, which dipped in the first half as mining moved between high-grade zones. The bigger question is execution on its rare earth strategy: integrating large acquisitions, building new circuits and competing with Chinese supply. Investors buying it for uranium are also buying a growing critical-minerals business.

The price backdrop helps both. Industry pricing firm TradeTech put the Spot Price at US$86.50 per pound and the long-term price at US$97 per pound at the end of July 2026, according to Energy Fuels.

The Bottom Line

Denison and Energy Fuels offer two contrasting ways to back new uranium supply. Denison is a focused bet on one very high-grade Canadian deposit and a new mining method, funded in part by selling uranium it bought cheaply, with the payoff arriving from 2028 if construction stays on track. Energy Fuels already produces uranium from American mines through the country's only operating conventional mill, but it is increasingly a diversified critical-minerals company whose future may depend as much on rare earths as on yellowcake. The choice comes down to concentrated development risk versus a broader, more complex business.