Sudbury, Ontario, – Frontier Lithium ("Frontier" or "the Company") is pleased to report an updated mineral resource estimate (MRE) for the Spark deposit, the second delineated premium spodumene-bearing lithium deposit at the PAK Lithium Project “Project”. The resource estimation has been prepared by BBA E&C Inc. Table 1 is a summary of the mineral resource estimate.

Highlights

Resource estimate update for Spark deposit includes:

18.8 million tonnes averaging 1.52% Li2O in the Indicated category, a 30% increase in size;
29.7 million tonnes averaging 1.34% Li2O in the Inferred category, a 64% increase in size;
The Spark lithium deposit remains open along strike and at depth.

“We are very pleased to announce a substantive increase of the size of the Spark deposit following over 16,000m of drilling and channeling completed in 2022. Particularly encouraging is the increased lithium grade from 1.40 to 1.52% Li2O of the indicated category of the Mineral Resource Estimate. Overall, this equates to a 27% increase in the size of the combined lithium pegmatites at the PAK Lithium Project. The grade increase together with the previously released results further support the ensuing PFS.", commented Garth Drever, Vice President Exploration of Frontier Lithium.

Table 1: Summary of Mineral Resource Estimate for Spark Pegmatite



Modeling was performed using Datamine Studio RM software with grades estimated using ordinary kriging (OK) interpolation methodology. Samples were composited at 2.0 metres down hole. Assessment of composites indicated no capping was required on the Li2O grades. Block grades were estimated on a multi pass basis with a minimum and maximum number of composites and maximum number of composites per drillhole required for each estimation pass. Block size is 5 metres by 5 metres (y) by 5 metres (z).

Additional information about the Mineral Resource modeling methodology will be documented in the NI 43-101 technical report (the "Technical Report") to be issued within 45 days.

The Spark pegmatite, discovered in September 2018 and delineated in 2019 and 2021 with four drill programs (20 holes totaling 5,768.7m and 14 channels totaling 342.4m). During 2022 two more drill programs totaling 50 holes (15,983.6m) and 60m of channel sampling with objectives of upgrading Inferred mineral resource category to Indicated mineral resource were completed. The results from all channels and drilling have been previously reported. Figure 1 is a location map showing the project area.

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