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FRONTIER LITHIUM'S FEASIBILITY STUDY CONFIRMS CA$932M NET PRESENT VALUE AND LOW-COST CONCENTRATE SUPPLY FOR PAK LITHIUM PROJECT Updated Mineral Reserve Estimate Confirms 37% Growth in PAK Project

Resource Estimates Economic Studies

FRONTIER LITHIUM'S FEASIBILITY STUDY

CONFIRMS CA$932M NET PRESENT VALUE

AND LOW-COST CONCENTRATE SUPPLY

FOR PAK LITHIUM PROJECT

Updated Mineral Reserve Estimate Confirms 37% Growth in PAK Project

GREATER SUDBURY, ON

,

May 28, 2025

/CNW/ -

Frontier Lithium Inc.

(TSXV: FL) (FRA: HL2)

(OTCQX: LITOF)

(the "Company" or "Frontier")

is pleased to report the results of its Definitive

Feasibility Study ("FS" or "Study" or "DFS") for the Mine and Mill segment of PAK Lithium Project

("PAK Project" or "Project") near

Red Lake, Ontario

. The Study confirms the Project could generate

an estimated CA$11 billion in net revenue over a 31-year mine life, with an after-tax net present

value (NPV) of CA$932 million, an Internal Rate of Return (IRR) of 17.9%, and average annual pre-

tax earnings of

$285 million

in steady-state operations. These robust economics land the Project

competitively in the global hard rock lithium cost curve, supporting Frontier's goal to become

North

America's

lowest-cost producer of spodumene concentrate.

Building on a 37% increase in mineral reserves, the Study establishes a stronger foundation for an

extended mine life, greater scale, and improved economic outcomes for the Project. The Project has

also been streamlined to produce a single, high-quality spodumene concentrate (SC6), aligning with

market demand and enhancing operational focus.

"This DFS is a key milestone that builds the confidence to advance permitting, infrastructure, and

strategic partnerships. With strong projected economics, low costs, and long-term earnings, the

Project could drive self-funded future growth and support

Canada's

Critical Minerals Strategy," said

Trevor Walker

, President and CEO. He added, "

Canada's

pro-battery policies give Frontier a

strategic edge as regional lithium supply deficits are expected to continue into the 2030s. We're

developing a high-quality, large-scale, low-cost lithium resource to anchor a domestic supply chain—

strengthening energy security, competitiveness, and sustainability. This is more than a lithium project

—it's about nation-building and delivering long-term value to shareholders and generations of

Canadians, including northern and Indigenous communities."

Kota Ikenishi, General Manager of Battery Minerals Department at Mitsubishi Corporation, added:

"We're very pleased with the release of this DFS, which marks an important step forward for the

project just over a year after our investment. This progress reflects the strong commitment and

capability of Frontier, and we truly appreciate their continued efforts. The DFS results highlight the

project's outstanding quality and scale, showing that it stands among the top-tier lithium projects in

North America

. We believe that the PAK Project will make a meaningful contribution to building a

reliable battery supply chain in

Ontario, Canada

and across

North America

. We look forward to

continue working closely with our partner as the project moves toward production."

Highlights of the Feasibility Study

Strong Project Economics (All in Canadian Dollars unless otherwise stated)

The DFS outlines a phased development plan, consisting of with a mine and mill to produce 6% Li

O

spodumene concentrate (SC6). The Project delivers compelling economics, including:

Potential cumulative net revenue: CA$11 billion

After-tax Net Present Value (NPV

8%

): CA$932 million

After-tax Internal Rate of Return (IRR): 17.9%

Average annual earnings (steady state): CA$285 million

Life of Mine (LOM): 31 years

These results provide a robust basis for the Company to advance a Final Investment Decision (FID)

target within the next 24 months.

Industry-Leading Cost Profile

C1 Operating Cost

1,2

(including transport): CA$602/t SC6 (

US$439

/t)[2]

All-in Sustaining Cost (AISC)

3,4

: CA$624/t SC6 (

US$456

/t)

Average Annual SC6 Production: 200,000 tonnes

Life-of-Mine Stripping Ratio: 3.7:1 (waste:ore)

Concentrate transportation assumptions are based on free on board (FOB) terms at

Thunder Bay

,

where Frontier recently acquired a vacant industrial site on Mission Island to house its planned

lithium conversion facility

5

. These cost metrics position the PAK Project firmly in a competitive

position on the global hard rock cost curve, underscoring its strong cost competitiveness and

resilience in volatile market conditions.

Substantial Economic Contribution

Over

$1 billion

in federal and

$699 million

in provincial tax revenues expected over the life of the

Project.

Additional

$645 million

of Ontario Mining Tax estimated for the province;

Creation of more than 230 jobs at the mine site and sustained for the life of the Project.

_________________________________

1

C1 Cost and C1 Cost per tonne of concentrate sold: C1 Cost consists of all production related expenses including mining, processing, services, tailings handling, royalties, and

general and administrative, plus treatment charges, penalties, transportation and other selling costs. C1 Cost per tonne of concentrate sold is calculated as C1 Cost divided by

tonnes of spodumene concentrate sold.

2

US$:CA$: 1.00:1.37

3

All-in Sustaining Costs (AISC) and AISC per tonne of concentrate sold: AISC consists of C1 Cost plus sustaining capital. AISC per tonne of concentrate sold is calculated as AISC

divided by tonnes of spodumene concentrate sold.

4

C1 Costs and AISC are non-GAAP financial measures or ratios and have no standardised meaning under IFRS Accounting Standards and may not be comparable to similar

measures used by other issuers. As the Project is not in production, Frontier does not have historical non-GAAP financial measures nor historical comparable measures under IFRS,

and therefore the foregoing prospective non-GAAP financial measures or ratios may not be reconciled to the nearest comparable measures under IFRS

5

The lithium conversion facility will be developed separately by Frontier and is not included in the cost metrics described herein nor in the associated Technical Report.

Expanded Mineral Reserves, Resources and Exploration Upside

Proven & Probable Reserves: 31.1 million tonnes @ 1.51% Li

O — a 37% increase over the

Company's pre-feasibility study published in 2023.

Maiden Inferred Resource at the Bolt deposit: 5.5 million tonnes @ 1.23% Li

O.

All deposits remain open at depth and with the recent Ember pegmatite discovery, located 1 km

north of the Spark deposit, this further highlights the ongoing exploration upside and broader regional

potential.

Frontier is advancing project financing and has commenced the permitting process which is expected

to be completed within the next two years.

Table 1. PAK Project DFS – Summary of Key Results and Assumptions

Description

Units

Value

Macroeconomic Parameters

SC6 Spodumene Concentrate Price,

Long-Term

US$

1,475

US$:CA$ Exchange Rate, Long-Term

US$:CA$

1.00:1.37

Inflation Rate, Long-term

1

%

2.0

Project Parameters

Discount rate (real terms)

%

8.0

Mine life

Years

31

Mineable Mineral Reserves, Total

Mt of ore

31.1

Mineable Mineral Reserves, PAK

Mt of ore

3.9

Mineable Mineral Reserves, Spark

Mt of ore

27.2

Grade Mined, PAK (LOM average)

% Li

2

O

1.96

Grade Mined, Spark (LOM average)

% Li

2

O

1.44

Annual Mill Throughput (LOM average)

Ktpa

1,040

Lithium Recovery, PAK (LOM average)

%

77.9

Lithium Recovery, Spark (LOM average)

%

77.5

Concentrate Grade

% Li

2

O

6.0

Total Concentrate Produced (LOM)

Mt

6.1

Capital Expenditures

(real terms)

Development Capital

CA$ M

943

Sustaining Capital

CA$ M

137

Closure Capital

CA$ M

60

LOM Unit Operating Expenditure

(real terms)

Mining

CA$/tonne of ore processed

28.7

Processing

CA$/tonne of ore processed

31.3

Tailings Management Facility

CA$/tonne of ore processed

1.2

Non-process power

CA$/tonne of ore processed

1.2

Heating

CA$/tonne of ore processed

0.9

G&A

5

CA$/tonne of ore processed

23.7

Total Opex

CA$/tonne of ore processed

87.0

Other Expenditures

(real terms)

Concentrate transport costs

CA$/tonne of concentrate sold (wet)

143

LOM Undiscounted Cash Flows

(real terms)

Net Revenue

CA$ M

11,298

Total Opex

CA$ M

(2,709)

Closure Bond Fees

CA$ M

(19)

Operating Earnings

CA$ M

8,569

Capital Expenditures

CA$ M

(1,138)

Clean Technology Manufacturing Investment Tax Credit

CA$ M

120

Change in Working Capital

CA$ M

(15)

Pre-Tax Cash Flow

CA$ M

7,536

Income Tax, Federal

CA$ M

(1,049)

Income Tax, Provincial

CA$ M

(699)

Mining Tax, Provincial

CA$ M

(645)

After Tax Cash Flow

CA$ M

5,144

Cost Metrics

(real terms)

C1 Cost

2, 4

CA$/tonne of concentrate sold

602

All-In Sustaining Cost (AISC)

3, 4

CA$/tonne of concentrate sold

624

Notes:

1. The inflation rate is used in the tax, depreciation, and working capital calculations only. The results of these calculations are deflated using the same inflation rate for use in the

cash flow model.

2. C1 Cost and C1 Cost per tonne of concentrate sold: C1 Cost consists of all production related expenses including mining, processing, services, tailings handling, royalties, and

general and administrative, plus treatment charges, penalties, transportation and other selling costs. C1 Cost per tonne of concentrate sold is calculated as C1 Cost divided by

tonnes of spodumene concentrate sold.

3. All-in Sustaining Costs (AISC) and AISC per tonne of concentrate sold: AISC consists of C1 Cost plus sustaining capital. AISC per tonne of concentrate sold is calculated as AISC

divided by tonnes of spodumene concentrate sold.

4. C1 Costs and AISC are non-GAAP financial measures or ratios and have no standardised meaning under IFRS Accounting Standards and may not be comparable to similar

measures used by other issuers. As the Project is not in production, Frontier does not have historical non-GAAP financial measures nor historical comparable measures under IFRS,

and therefore the foregoing prospective non-GAAP financial measures or ratios may not be reconciled to the nearest comparable measures under IFRS.

5. G&A Opex presented in this section includes allowances for operations insurance and community program payments.

6. Numbers may not add due to rounding.

Mineral Resource and Reserves Estimate

The PAK Project is a greenfield project located approximately 175 kilometers (km) north of the

municipality of

Red Lake, Ontario

within the Red Lake Mining Division and the traditional territory of

four First Nations (Figure 1). The Project spans nearly 28,000 hectares and hosts

Ontario's

highest-

grade and largest lithium resource. Since 2013, Frontier has defined three high-quality spodumene-

bearing deposits—PAK, Spark, and Bolt—located within just 3 km of each other. Ongoing

exploration has also led to the discovery of two additional spodumene-bearing pegmatites Ember

and Pennock, both situated within the broader Project area.

Figure 1: Map Showing a Plan View of the Resource Models For PAK, Spark and Bolt Deposits.

(CNW Group/Frontier Lithium Inc.)

The Mineral Resource Estimates for the Project were based on 10,008 metres (m) drilled in 54

drillholes plus

244 m

of surface channels at PAK;

22,956 m

in 77 drillholes plus

363 m

of channels at

Spark and

3,085 m

in 15 drillholes plus

134 m

of channels at Bolt. The PAK Lithium Project's Proven

and Probable mineral reserve is 31.1 million tonnes (Mt) averaging 1.51% Li

2

O, which is included

within the Measured and Indicated mineral resource of 35.2 Mt averaging 1.53% Li

2

O. The mineral

reserve and resource estimates for the PAK Lithium Project are summarized in Tables 2 through 4

below, which detail the drill and channel sampling data supporting the estimates, along with the

breakdown of Proven and Probable reserves and the Measured and Indicated resources across the

PAK, Spark, and Bolt deposits. Table 4 provides as well as a comparison between the 2023 PFS

and 2025 FS Mineral Reserves.

Table 2: Summary of the Mineral Resource Estimate

Deposit

Category

Li

2

O Cut Off Grade (%)

Tonnage (kt)

Li

2

O Grade (%)

Contained Li

2

O (kt)

Open Pit

PAK

Measured

0.65

2,585

2.03

52

Indicated

1,521

1.96

30

Measured + Indicated

4,106

2.00

82

Inferred

122

1.50

2

Spark

Measured

0.65

13,796

1.54

212

Indicated

17,304

1.41

244

Measured + Indicated

31,100

1.47

456

Inferred

10,954

1.53

167

Bolt

Measured + Indicated

0.65

-

-

-

Inferred

5,516

1.23

68

Total

Measured

0.65

16,381

1.61

264

Indicated

18,825

1.45

273

Measured + Indicated

35,206

1.53

538

Inferred

16,592

1.43

237

Underground

PAK

Measured

0.80

-

-

-

Indicated

1,703

2.39

41

Measured + Indicated

1,703

2.39

41

Inferred

1,995

2.19

44

1. The Mineral Resource Estimate has been estimated using the Canadian Institute of Mining, Metallurgy and Petroleum (CIM) Definitions Standards for Mineral Resource and

Mineral Reserve in accordance with National Instrument 43-101 - Standards of Disclosure for Mineral Projects. Mineral Resources which are not Mineral Reserves, do not have

economic viability.

2. Inferred Mineral Resources are exclusive of the Measured and Indicated Resources.

3. In-pit Resources are constrained by Pseudoflow optimized pit shells using HxGn MinePlan

TM

3D

4. Pit shells were developed using pit slopes of 45

0

for PAK and Bolt and 43 degrees for Spark, sales price of U$1,500/t for 6.0% Li

2

O chemical grade concentrate, exchange

rate of 1.30 CA$/US$, mining costs of US$7.80/t and US$7.15/t for ore and waste, respectively, processing costs of US$23.85/t milled, G&A costs of US$26.22/t milled, sustaining

capital costs of US$4.28/t milled, closure costs of US$1.99/t milled, process recovery of

78.0

%,and transportation costs of US$100.79/t concentrate..

5. In-pit estimates are reported in-situ, at a cut-off grade of 0.65% Li

2

O.

6. Underground mining stope optimization was performed using Deswik

TM

.

7

. Stope shapes were developed using a sales price of US$1,500/t for 6.0% Li

2

O chemical grade concentrate, exchange rate of 1.30 CA$/US$, mining costs of US$85.00/t,

processing costs of US$23.85/t milled, G&A costs of US$26.22/t milled, sustaining capital costs of US$4.28/t milled, closure costs of US$1.99/t milled, process recovery

of

78.0

%, and transportation costs of US$100.79/t concentrate.

8. Underground resources were estimated using a cut-off grade of 0.80% Li

2

O.

9

. Resource estimations were interpolated using Inverse Distance Weighting (IDW

2

); variable densities were also interpolated using the same method.

Notes:

10

. The effective date of the Mineral Resource Estimate is

November 30

, 2023.

11

. The independent and Qualified Person for the Mineral Resource Estimate, as defined by NI 43-101, is Schadrac Ibrango, P.Geo., of DRA Americas Inc.

11. Figures have been rounded to an appropriate level of precision for the reporting of Mineral Resources. Thus, totals may not compute exactly as shown.

Table 3: Summary of Mineral Reserve Estimate

Open Pit

Deposit

Category

Li

2

O Cut Off Grade (%)

Diluted Tonnage (kt)

Li

2

O Grade (%)

Contained Li

2

O (kt)

PAK

Proven

0.65

2,520

1.97

50

Probable

1,427

1.94

28

Proven + Probable

3,947

1.96

77

Spark

Proven

0.65

13,670

1.51

206

Probable

13,514

1.37

185

Proven + Probable

27,183

1.44

392

Total

Proven

0.65

16,190

1.58

256

Probable

14,941

1.42

213

Proven + Probable

31,131

1.51

469

Notes:

1. The Mineral Reserve Estimate has been estimated using the Canadian Institute of Mining, Metallurgy and Petroleum (CIM) Definitions Standards for Mineral Resource and

Mineral Reserve in accordance with National Instrument 43-101 - Standards of Disclosure for Mineral Projects.

2. The mineral reserve was derived from a pit limit analysis and detailed pit design using Measured and Indicated Resources at a cut-off grade of 0.65% Li

O.

3. Pit optimization was performed using pit slopes of 45° for PAK and Bolt and 43° degrees for Spark, sales price of U$1,500/t for 6.0% Li2O chemical grade concentrate,

exchange rate of 1.30 US/CAD, mining costs of US$7.80/t and US$7.15/t for ore and waste, respectively, processing costs of US$23.85/t milled, G&A costs of US$26.22/t milled,

sustaining capital costs of US$4.28/t milled, closure costs of US$1.99/t milled, process recovery of 78.0%, transportation costs of US$100.79/t concentrate, discount rate of 8%,

and assumed production rate of 1.04 Mtpa.

4. For PAK, the pit shell selected for the ultimate pit design is RF 0.60, based on a selling price of US$900 for a 6.0% Li

O chemical-grade concentrate. For SPARK, the selected

pit shell for the ultimate design is RF 0.45, corresponding to a selling price of US$675 for a 6.0% Li

O chemical concentrate.

5. For the PAK and SPARK deposit, the mineral reserve estimate includes external dilution and mining loss.

6. PAK mineral reserves are based on a pit design with a 5.9 stripping ratio. SPARK mineral reserves are based on a pit design with a 3.3 stripping ratio.

7. The effective date of the Mineral Reserve Estimate is

May 28, 2025.

8. The independent and Qualified Person for the Mineral Reserve Estimate, as defined by NI 43-101, is Ghislain Prevost, P.Eng., of DRA Americas Inc.

9. Figures have been rounded to an appropriate level of precision for the reporting of Mineral Reserves. As a result, totals may not compute exactly as shown.

Table 4: Comparison of 2023 and 2025 Mineral Reserve Estimates

2025 - DFS Reserve

2023 - PFS Reserve

Increase kts Li

2

O (PFS-

DFS)

Cut-off

Li

2

O%

Resource

Category

Tonnage

(kt)

Li

2

O

%

kts

Li

2

O

Cut-off

Li

2

O%

Resource

Category

Tonnage

(kt)

Li

2

O

%

kts

Li

2

O

PAK - Open Pit

PAK - Open Pit

0.65

Proven

2,520

1.97

50

0.65

Proven

-

-

-

Probable

1,427

1.94

28

Probable

4,041

1.79

72

-62 %

Proven-Probable

3,947

1.96

77

Proven-Probable

4,041

1.79

72

7 %

Spark - Open Pit

Spark - Open Pit

0.65

Proven

13,670

1.51

206

0.65

Proven

-

-

-

Probable

13,514

1.37

185

Probable

18,028

1.50

270

-32 %

Proven-Probable

27,183

1.44

392

Proven-Probable

18,028

1.50

270

45 %

PAK Lithium Project

PAK Lithium Project

0.65

Proven

16,190

1.58

256

0.65

Proven

-

-

-

Probable

14,941

1.42

212

Probable

22,069

1.55

343

-38 %

Proven-Probable

31,131

1.51

469

Proven-Probable

22,069

1.55

343

37 %

Project Economics

The PAK Project's mine and mill is designed to produce 200,000 tonnes of chemical-grade

concentrate annually, totaling approximately 6.1 million tonnes over a 31-year mine life. The Project

is expected to generate a total of

$5.14 billion

in after-tax cash flow, driven by strong operating

margins and capital requirements.

With projected net revenue of

$11.3 billion

, the financial plan includes

$943 million

in initial

development capital,

$137 million

in sustaining capital, and

$60 million

in closure costs. This capital

structure supports robust cash generation with average annual earnings of

$285 million

. These

figures underscore the Project's potential to deliver strong and sustained economic returns.

The long-term spodumene concentrate price assumption of

US$1,475

per tonne, on a FOB basis at

Thunder Bay

, supports the Project's economic modeling. This assumption is informed by a pricing

study incorporating forecasts from SC Insights, a battery supply chain consultant, and several

financial institutions. While the lithium market remains in an early stage of development, structural

demand growth, primarily driven by the electric vehicle sector, combined with forecasted regional

supply deficits, supports a sustained positive price environment. These fundamentals support a

strong long-term outlook for spodumene concentrate pricing.

The base case for the PAK Project delivers an after-tax NPV

8%

of

$932 million

, an IRR of 17.9%,

and a 4.0-year payback period reflecting strong fundamentals. Sensitivity analysis shows Project

value is most responsive to spodumene concentrate prices. For example, a 20% increase in

spodumene concentrate prices raises NPV of the Project to

$1.37 billion

and IRR to 21.6%, while a

10% decrease in spodumene concentrate prices reduces the NPV of the Project to

$712 million

and

the IRR to15.9%. The economic analysis is based on an assumed FID in first half 2027 and project

kick off in

June 2026

.

Operating and capital costs for the Project have a more moderate sensitivity impact. A 20%

decrease in total Opex lifts NPV to

$1.03 billion

(IRR 18.9%), while a 20% increase reduces it to

$830 million

(IRR 17.0%). Capex shifts of ±20% move NPV between

$1.04 billion

and

$824 million

,

with IRR ranging from 21.0% to 15.7%.

Overall, the PAK Project remains resilient under varied scenarios. Figure 2 below, demonstrates the

Project's ability to maintain robust economics across a range of key variables including capital and

operating costs, exchange rates, and concentrate pricing.

Figure 2: Sensitivity of NPV to Capex, Opex, Recovery, Exchange rate and Concentrate Price (CNW

Group/Frontier Lithium Inc.)

Project Schedule

The overall schedule for the Mine and Mill segment of the PAK Lithium Project has been developed

during the DFS. Frontier anticipates to secure key permits by the first half of 2027, which would

enable the FID. In parallel, a critical infrastructure initiative, the Beren's

River Bridge

and all-season

road, is expected to commence in 2025 and be completed by the end of 2027 to more readily

access the Project. An indicative timeline of the major Project segments is presented in Figure 3

below.

Figure 3: PAK Lithium Project, Mine and Mill Indicative Timeline (CNW Group/Frontier Lithium Inc.)

Prior to advancing the Project to detailed engineering, the Project schedule will be revisited and is

subject to final design engineering, permitting approvals, infrastructure upgrades, market conditions

and project financing activities. In addition, Frontiers intends to actively pursue opportunities to

optimize capital and operating costs, as well as potential resource expansion, for integration to

enhance overall Project efficiency.

Project Advancement & Opportunity Optimization

Frontier remains committed to advancing the mine and mill towards production, while identifying

opportunities to optimize the broader integrated development. Key ongoing activities supporting this

goal include:

Progressing through the permitting process while actively engaging and consulting with First

Nations and with governmental agencies. The next major permitting milestones are

Environmental Compliance Approval - Air Emissions and Noise; Industrial Sewage and the

Closure Plan.

Advancing development of all-season road access and infrastructure in the region through

engagement and consultation with First Nations and with federal and provincial support.

These actions are consistent with Frontier's goal of advancing the fully integrated PAK Lithium

Project, starting with the mine and mill near

Red Lake

and becoming a leading lithium producer in

North America

. Advancing the upstream segments and securing concentrate production are essential

steps toward enabling local conversion and capturing investment in

Ontario's

emerging battery and

electric vehicle supply chain.

Report Filing

The complete NI 43-101 technical report associated with the DFS will be available on SEDAR+ at

www.sedarplus.ca

under the Company's issuer profile, as well as the Company's website at

www.frontierlithium.com

within 45 calendar days of this press release.

Qualified Persons

All scientific and technical information in this release has been reviewed and approved by QP

Schadrac Ibrango, P.Geo., of DRA Americas Inc., QP Ghislain Prévost, P.Eng. of DRA Americas

Inc., and QP Garth Drever, P.Geo., VP Exploration for Frontier Lithium Inc. under the definitions

established by National Instrument 43-101. Under Frontier's QA/QC procedures, all drilling was

completed by Chenier Drilling Ltd. of

Val Caron, Ontario

using BTW and NQ drill rods and a Reflex

ACT III oriented core system. Using the Reflex system, the drill core was oriented and marked as it

was retrieved at the drill. Either a Reflex EZ-Trac survey or a Reflex Gyro Sprint-IQ instrument was

used every

50 m

downhole and again at the end of each hole when rods were pulled out. A Reflex

North Finder APS unit was utilized to complete accurate positioning and orientation of the drill collar

upon setup. The core was boxed and delivered to the Frontier core shack where it was examined,

geologically logged, and marked for sampling. The core was photographed prior to sampling. Using

a rock saw, the marked sample intervals were halved with one-half bagged for analysis. Sample

blanks along with lithium certified reference material was routinely inserted into the sample stream in

accordance with industry recommended practices. Field duplicate samples were also taken in

accordance with industry recommended practices. The samples were placed in poly sample bags

and transported to AGAT Laboratories Ltd. (AGAT) in

Thunder Bay, Ontario

for sample preparation

and to

Mississauga, Ontario

for processing and quantitative multi-element analysis. AGAT is an ISO

accredited laboratory. The core is stored on site at the Company's Knox exploration camp.

About Frontier Lithium

Frontier Lithium is a pre-production company committed to enabling electrification by delivering

sustainably sourced lithium products, responsibly mined and processed in northern

Ontario

, to

support

North America's

electric vehicle and battery industries. The Company's PAK Lithium Project

holds the largest land position and proven lithium resource in

Ontario's

premier lithium district,

located in the Great Lakes region.

About the PAK Lithium Project

The PAK Lithium Project is a fully integrated lithium development initiative advancing the highest-

grade known lithium resource in

North America

. Operated as a joint venture between Frontier Lithium

Inc. (92.5%) and Mitsubishi Corporation (7.5%), the project includes two key segments: Mine and

Mill, and Downstream Conversion Facility for battery-grade lithium salt production. A 2025 Feasibility

Study (FS), prepared by DRA and entitled

National Instrument 43-101 Technical Report FS PAK

Lithium Project, Mine and Mill

, outlines a 31-year Project life with an after-tax NPV of CA

$932

million

at an 8% discount rate and an after-tax IRR of 17.9%. These results were disclosed in a

press release dated

May 28, 2025

, and will be filed on SEDAR+ (

www.sedarplus.ca

). The full

technical report will be filed within 45 days of the press release.

Cautionary Note Regarding Forward-Looking Statements

This news release includes certain statements that may be deemed "forward-looking statements".

All statements in this release, other than statements of historical fact constitute forward-looking

statements. Forward looking statements contained in this news release may include, but are not

limited to, statements with respect to: estimated mineral resources, estimated capital costs and

timing to construct mine facilities, estimated operating costs (including sustaining costs and

improvements in respect thereof), all estimates and assumptions relating to the economic analysis

and financial summaries, the duration of payback periods, expected strip ratios, estimated amounts

of future production, estimated accumulated revenues, estimated cash flows, lithium prices and

assumptions, net present value, internal rate of return, the DFS, technical report, the pre-feasibility

study and its assumptions, and statements that address future production, resource and reserve

potential, exploration drilling, exploitation activities and events or developments that the Company

expects.

Although the Company believes the expectations expressed in such forward-looking statements are

based on reasonable assumptions, such statements are not guarantees of future performance and

actual results may differ materially from those expressed in the forward-looking statements.

Forward-looking statements involve inherent risks and uncertainties. Risk factors that could cause

actual results to differ materially from those in forward looking statements include: the Company

may not develop its mineral projects into a commercial mining operations, lithium prices and

assumptions as the lithium market continues to evolve to a more centralized market and away from a

concentrated market in

China

and as such the lithium market and its pricing does not yet possess

the price certainty features that other tradeable metals with a more mature market have, making

price assumptions and forecasting for lithium complex and uncertain, accuracy of mineral reserve

and resource estimate and related assumptions, increases in capital or operating costs, construction

timing, costs and risks of completion, availability of infrastructure including roads, regulatory and

permitting risks, exploitation and exploration successes, continued availability of capital and financing

(both private and public), financing costs, and general economic, market or business conditions.

Investors are cautioned that any such statements are not guarantees of future performance and

those actual results or developments may differ materially from those projected in the forward-

looking statements. For more information on the Company, please review the Company's public

filings available at

www.sedarplus.ca

.

Neither the TSX Venture Exchange nor its Regulation Services Provider (as that term is

defined in the policies of the TSX Venture Exchange) accept responsibility for the adequacy

or accuracy of this release.

SOURCE

Frontier Lithium Inc.

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