Apex Discovers Mineralized Carbonatite at its Lac Le Moyne Project, Québec

VANCOUVER, BC / ACCESS Newswire / December 15, 2025 / Apex Critical Metals Corp. (CSE:APXC)(OTCQX:APXCF)(FWB:KL9) ("Apex" or the "Company"), a Canadian mineral exploration company focused on the identification and development of critical and strategic metals, is pleased to announce results from a new carbonatite discovery at its 100%-owned Lac Le Moyne Project ("Lac Le Moyne" or "the Project") in Nunavik, Québec.

Highlights

• Discovery of new carbonatite occurrence at the Lac Le Moyne Project.

• 151 rock samples collected during the July 2025 program, marking the first targeted carbonatite exploration at the Project.

• Four (4) boulder grab samples returned >0.20% Nb₂O₅, with values up to 0.40% Nb₂O₅.

• Thirteen (13) samples returned > 0.25% total rare earth oxides (REO¹), including a peak of 0.50% REO.

• An additional 77 claims have been staked to cover the interpreted up-ice source responsible for the anomalous boulder samples.

Sean Charland, CEO of Apex Critical Metals, commented, "There are only ~600 known carbonatite systems globally, so confirming the presence of carbonatite with substantially anomalous niobium and rare earth oxide mineralization during our first pass mapping and sampling campaign at Lac Le Moyne is a significant step forward for the Project and exceeded our expectations. The Project's position north of the Eldor Carbonatite Complex, a complex known for its high-grade Ashram Rare Earth and Fluorspar Deposit as well as high-proximal grade niobium, tantalum, and phosphate, highlights the potential for further discoveries in the area. We look forward to advancing follow-up work to refine targets and build on the results from this initial program."

The summer exploration program was completed in July 2025, with a total of 151 rock samples collected. The exploration program marked the first targeted exploration for carbonatite-hosted niobium (Nb) and rare earth element (REE) mineralization at the Project. The program was a helicopter-supported operation based out of Kuujjuaq, designed to evaluate multiple carbonatite outcrops originally mapped by Québec government geologists in the 1970s.

The elevated samples are dominated by carbonatite and carbonatite-related lithologies, with all four (4) boulder samples exceeding 0.20% Nb₂O₅ to a maximum of 0.40% Nb₂O₅ occurring in calcite-rich carbonatite boulders (Table 1, Figure 1). The strongest REO results (>0.25% REO, including the peak value 0.50%) are hosted within dolomitic carbonatite and carbonatite-altered units (Table 1). Additional elevated samples occur in calcite-carbonatite, fluorine-carbonatite, and metasomatic (fenite-style) rocks, supporting the interpretation of a multi-phase intrusive system with both carbonatite and alteration-related REE enrichment. Several of the carbonatite samples also exhibit high-grade phosphate, with seven (7) samples exceeding 5.0% P₂O₅ with a peak value of 10.36% P₂O₅, alongside notably enriched fluorine, including one sample assaying 4.94% F (Table 1). These signatures are fully consistent with apatite- and fluorite-bearing phases typically associated with REE mineralization in carbonatite systems.