First Phosphate Reports Publication of Peer-Reviewed Study of the Bégin-Lamarche Igneous Phosphate Deposit in Ore Geology Reviews

Saguenay, Quebec--(Newsfile Corp. - September 21, 2026) - First Phosphate Corp. (NASDAQ: PHOS) (CSE: PHOS) (OTCQX: FRSPF) (FSE: KD0) ("First Phosphate" or the "Company") is pleased to announce that the Company's Bégin-Lamarche Igneous Phosphate Deposit has been subject of a peer-reviewed study in Ore Geology Reviews (published on ScienceDirect), a premier scientific journal focusing on ore genesis and exploration.

The study highlights how economic, phosphate-rich layers in the Bégin-Lamarche deposit were formed. Results indicate these layers are low in chlorine and other trace elements making them suitable as a potential high-purity source of phosphate for production of purified phosphoric acid ("PPA"), a critical precursor in the manufacture of lithium iron phosphate ("LFP") battery cathode active material.