Saguenay, Quebec - Newsfile Corp. - June 10, 2025 - First Phosphate Corp. (CSE: PHOS) (OTCQB: FRSPF) (FSE: KD0) ("First Phosphate" or the "Company") announces that its recent white paper submission to the United States Department of Defense ("DoD") Defense Industrial Base Consortium ("DIBC") for securing a North American phosphate supply of lithium iron phosphate ("LFP") cathode active materials ("CAM") received a "Met" rating. A "Met" rating, which does not indicate the white paper has been selected for award at this time, means that the white paper is eligible for award for 36 months if the DoD has a need for the solution and funding becomes available. The DIBC's rationale for the "Met" assessment is as follows:

• First Phosphate's solution appears to be technically and economically viable and with Defense Production Act ("DPA") funding could become the first phosphate production facility strictly for LFP CAM in North America.

• The schedule/timeframe and cost rough order of magnitude ("ROM") are realistic and feasible as long as First Phosphate is able to secure the funding identified. DPA Title III funds are likely the most cost-effective, expedient, and practical alternative for the need.

• The domestic phosphate supply is primarily used for the food and fertilizer industries, and industry will likely not meet the needed capacity for the battery industry without DPA Title III assistance. DPA Title III funds are likely the most cost-effective, expedient, and practical alternative for the need.

• Phosphate, particularly for use in LFP CAM, is essential to national defense. Demand for LFP batteries is likely to continue to increase and having a domestic source greatly reduces dependency on China and their control over the LFP market.

The DIBC Other Transaction Authority (OTA) aims to accelerate the DoD's access to commercial solutions for defense requirements. The DIBC OTA vehicle is utilized by the Manufacturing Capability Expansion and Investment Prioritization (MCEIP) directorate of the DoD, which addresses defense supply chain issues, industrial workforce development, critical production sustainability, commercialization of R&D efforts, and the rapid scaling of emerging technologies to build a robust, resilient Defense Industrial Base. About First Phosphate Corp First Phosphate (CSE: PHOS) (OTCQB: FRSPF) (FSE: KD0) is a mineral development company dedicated to producing high-purity phosphate for the LFP battery industry. The Company's vertically integrated approach connects sustainable phosphate mining in Quebec with North American battery supply chains, targeting the energy storage, data center, robotics, mobility, and defense sectors. First Phosphate's flagship Bégin-Lamarche Property in Saguenay-Lac-Saint-Jean is one of North America's rare igneous phosphate resources, yielding high-purity phosphate with minimal impurities. For additional information, please contact: Bennett Kurtz Chief Financial Officer bennett@firstphosphate.com Tel: +1 (416) 200-0657 Investor Relations: investor@firstphosphate.com Media Relations: media@firstphosphate.com Website: www.FirstPhosphate.comFollow First Phosphate: X: https://twitter.com/FirstPhosphate LinkedIn: https://www.linkedin.com/company/first-phosphateForward-Looking Information and Cautionary StatementsThis news release contains certain statements and information that may be considered "forward-looking statements" and "forward looking information" within the meaning of applicable securities laws. In some cases, but not necessarily in all cases, forward-looking statements and forward-looking information can be identified by the use of forward-looking terminology such as "plans", "targets", "expects" or "does not expect", "is expected", "an opportunity exists", "is positioned", "estimates", "intends", "assumes", "anticipates" or "does not anticipate" or "believes", or variations of such words and phrases or statements that certain actions, events or results "may", "could", "would", "might", "will" or "will be taken", "occur" or "be achieved" and other similar expressions. In addition, statements in this news release that are not historical facts are forward looking statements, including, among other things: the Company's planned exploration and production activities; the properties and composition of any extracted phosphate; the Company's plans for vertical integration into North American supply chains, the Company's plans relating to the design, build, operation and maintenance of the Bégin-Lamarche Phosphate Mine (and the the possibility of eventual economic extraction of minerals from therefrom); the technical and economic viability of First Phosphate's solutions; any receipt of DPA funding including its approval, availability, amount (if any), and conditions; the development of an LFP cathode materials production facility; the applicability of the proposed technological process and any related advancements...