Skyharbour Closes Major Strategic Transaction with Denison Mines to Form Four New Joint Ventures at Russell Lake with Combined Project Consideration up to $61.5 Million

Vancouver, BC, Dec. 17, 2025 (GLOBE NEWSWIRE) -- Skyharbour Resources Ltd. (TSX-V: SYH) (OTCQX: SYHBF) (Frankfurt: SC1P) (“Skyharbour”, “SYH” or the “Company”) is pleased to announce the closing of the definitive repurchase agreement (the “Strategic Agreement”) with Denison Mines Corp. (“Denison” or “DML”), whereby Denison has acquired an initial project interest in Skyharbour’s Russell Lake Uranium Project (“Russell” or the “Project”) and the parties have entered into four separate joint venture agreements on various claims making up Russell (the “Transaction”). The Project is strategically located in the central portion of the Eastern Athabasca Basin of northern Saskatchewan, with access to regional infrastructure, including an exploration camp, all-weather road and powerline.

Russell Lake Project Location Map:
http://www.skyharbourltd.com/_resources/images/2025-11-14%20SKY-Russel ...

Highlights:

• Strategic Agreement represents combined total project consideration of up to CAD $61.5 million consisting of cash payments to Skyharbour totalling $10.0 million, additional consideration of $8.0 million payable in cash and shares before year end, and expenditures and cash payments totalling up to $43.5 million for Denison to acquire between a 20% and 70% ownership interest over seven years in the claims making up Russell, with Skyharbour owning the remaining interests.

• Denison (TSX: DML; NYSE American: DNN), a leading uranium mining company with a market capitalization of over $3 billion, is developing the Wheeler River Project (“Wheeler River”), which shares a 55 kilometre border with Russell. Denison is an existing, large corporate shareholder of Skyharbour and now joins the Company as a strategic, active, funding partner at Russell.

• The Project has been divided into four different joint ventures, including Russell Lake (“RL”), Getty East, Wheeler North, and the Wheeler River Inlier Claims, of which Skyharbour will retain initial ownership interests of 80%, 70%, 51%, and 30%, respectively. Denison can then earn up to a 70% interest in the Wheeler North and Getty East properties through option agreements.

• The geological teams of Denison and Skyharbour have begun working cooperatively to advance and unlock value across the joint ventures, employing top-tier exploration and development expertise in the region.

• Denison has committed to a minimum of $4 million in exploration expenditures over the first two years at Wheeler North and Getty East combined, as well as agreeing to fund to maintain its pro-rata 20% participation interest in the RL claims through 2029 up until such time that total exploration expenditures on the property reach $10 million.

• Skyharbour will remain operator with an 80% ownership interest at the RL claims comprising over 53,192 hectares of the original 73,314 hectare Russell Lake Project. The Company will also act as operator during the first earn-in at Getty East with Denison sole funding the exploration in order to fulfill the earn-in option criteria.

• Skyharbour is well funded going into 2026 with over $11 million in the treasury. The Company will also generate revenue from its operator fee at the McGowan Lake exploration camp at the Project, as well as from cash and share payments from other option earn-in partner companies.

• Skyharbour will continue to directly advance its high-grade Moore Uranium project as well as the RL claims at Russell, while partner companies fund exploration at some of the Company’s other projects.

Reorganization of the Russell Lake Project: