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Sage Potash Completes a PEA That Delivers After-Tax NPV of US$502 Million and IRR of 39% PEA Highlights Compelling project economics with US$502 million* unlevered and after-tax Net Present Value (NPV 8% ) and 39%* Internal Rate of Return (IRR).

Economic Studies

Sage Potash Completes a PEA That Delivers

After-Tax NPV of US$502 Million and IRR of

39%

PEA Highlights

Compelling project economics with

US$502 million*

unlevered and after-tax Net Present Value

(NPV

8%

) and

39%*

Internal Rate of Return (IRR).

A premium potash deposit with an inferred resource of

298 million metric tonnes

, with

42.1%

KCl grade

(

26.6% K

2

O

) and

less than

1 percent insolubles and 0.01% carnallite

.

A critical mineral potash project that supports domestic production with potential for scalable

incremental capacity and resource expansion.

Cash flow positive in

2

years

and rapid investment payback within

5 years

attributable to advance

status of permitting, engineering and short timeline to production.

Significant US (United States) in-market transportation cost advantages.

Industry low start-up project

Capital Expenditures (CapEx) of $155 million

including $26 million

contingencies and $16 million construction indirect costs (combined 27% of total project).

Cautionary statement

: Readers are cautioned that the PEA is preliminary in nature, it includes inferred

mineral resources that are considered too speculative geologically to have economic considerations

applied to them that would enable them to be categorized as mineral reserves, and there is no certainty

that the PEA will be realized. The Company has not defined any mineral reserves for the Project. Mineral

resources are not mineral reserves and do not have demonstrated economic viability.

Vancouver, British Columbia--(Newsfile Corp. - September 22, 2025) - Sage Potash Corp. (TSXV:

SAGE) (OTCQB: SGPTF) ("Sage Potash" or the "Company"), a Canadian company focused on

advancing its Sage Plain Potash Project (the "Project") in the Paradox Basin, Utah, is pleased to

announce the results of a positive Preliminary Economic Assessment ("PEA"). The PEA highlights the

potential for robust project economics, a significant domestic resource base, and growth potential to

establish a scalable and sustainable potash production hub in the United States.

CEO Commentary

Peter Hogendoorn, Chief Executive Officer of Sage Potash, stated:

"This PEA reinforces our conviction that our proposed approach of incremental potash production using

solution mining is a cost effective and low risk strategy to bring in-market potash production on-line in the

US. We expect this approach would allow us to scale up production with cash flow to eventually become

the largest domestic potash supplier in the US market. Currently, the US market imports more than 95

percent of its potash requirements and Sage Potash's goal is to become a supplier of choice in the

United States. The possibility of high margins and scalable expansion suggested by the PEA makes for

a robust asset with stability through a wide range of market conditions."

President Commentary

Tim Mizuno, President and Chief Operating Officer of Sage Potash, added:

"The PEA suggests that we can support the critical agricultural and food security needs of the US market

and deliver meaningful value to shareholders. This is an exceptionally accretive potash project with a

high grade and expansive potash resource. Sage Plain is one of the best potash projects I have seen in

the decades I've spent in the industry and foundational to me joining the Company earlier this year. As

we advance toward production, we expect to further de-risk the Project and build strong partnerships

with farmers and the broader agricultural industry."

PEA Overview

To view an enhanced version of this graphic, please visit:

https://images.newsfilecorp.com/files/11610/267506_sp%20table.jpg

The PEA was completed by Sage Potash in partnership with RESPEC, a leading engineering firm

specializing in integrated technology solutions for mining, energy, infrastructure, water and natural

resources. The PEA includes design of an initial solution-based mining and production unit for an annual

capacity of 300,000 metric tonnes (mt) per year delivering an average of approximately $72 million* per

year in free cash flow once it is fully in production.

The Project is located in San Juan County, Utah, in close proximity to the agricultural areas in the Pacific

Northwest region of the United States. The PEA estimates an inferred mineral resource of 298 million mt

in-situ sylvinite equating to approximately 118 million mt KCl within a 2,400-meter radius of drilled wells.

This radius represents approximately 4 percent of the approximately 26,000 acres of leased mineral

rights. This resource can support multiple phases of production and does not include potential results

from Bureau of Land Management prospecting permits accounting for another 58,780 acres.

Utah Paradox Basin Deposit and Sage Potash

To view an enhanced version of this graphic, please visit:

https://images.newsfilecorp.com/files/11610/267506_sage%20potash%20fig%201.jpg

The PEA will be filed with Canadian securities regulatory authorities and available on SEDAR+ within 45

days of this announcement. When available, readers are encouraged to read the PEA in the Company's

technical report ("Technical Report") prepared pursuant to National Instrument 43-101 -

Standards of

Disclosure for Mineral Projects

("43-101") in its entirety, including all qualifications, assumptions and

exclusions that relate to the PEA and mineral resource model.

The Technical Report is intended to be

read as a whole, and sections should not be read or relied upon out of context.

ECONOMIC Overview

The economic analysis in the PEA includes the proposed construction of a 300,000 mt per year potash

plant with an initial development plan of 7 caverns and growing to 15 caverns over the first 5 years of

production. Sage Potash plans to complete an already permitted exploration well designed to production

specifications to confirm cavern porosity and flow rates, which will then be converted to the Company's

first production well. Results from this well may result in lowering cavern requirements.

Potash would be produced through an initial 300,000 mt plant accessing the potash resource from the

upper and lower potash horizons of Cycle 18. Processing for recovery of potassium chloride (KCl) uses

triple-effect evaporators, crystallization and fluidized bed dryer for the removal of sodium chloride (NaCl)

and recovery of KCl. This method requires minimal amounts of fresh water when compared to solar

evaporation methods and allows the facility to operate year-round. This approach may be replicated and

scaled in future Project considerations.

With the mine to be located in-market and close to domestic demand, the Project has an economic

advantage relative to other sources of potash located outside of the United States. Additionally,

construction and operation of the proposed mine is de-risked by advanced engineering, advanced

permitting and the inclusion of potash as a critical mineral in the US.

Initial project CapEx of $155 million includes $26 million in contingencies and $16 million in construction

indirect costs (a combined 27% of total project). Over a 20-year Project life, the Project would generate

an unlevered after-tax NPV of $502 million* and 39 percent* IRR. Sustaining CapEx and further cavern

development average approximately $10 million per year equating to approximately $33/mt* over the life

of the Project. Total Project cumulative free cash flow is estimated at $1.26 billion* including total CapEx

over the life of the Project of $327 million*.

To view an enhanced version of this graphic, please visit:

https://images.newsfilecorp.com/files/11610/267506_sage%20potash%20fig%202.jpg

Economic Model Assumptions

NPV (After Tax Unlevered)

$502 million*

IRR (After Tax Unlevered)

39%*

Total Cash flow

$1.26 billion

Payback period

Cash flow positive

5 years

2 years

Sales Price

(1)

$450 ($/mt)

Discount rate

8%

Start-up Capital Expenditures

Solution Mining

$50M (33%)

Plant and Infrastructure

$63M (40%)

Construction Indirect Costs

$16M (10%)

Contingencies

$26M (17%)

Total

$155M (100%)

(1)

The sales price of $450 per tonne FOB mine site selected for the economic analysis is based on publicly available information

through the US Department of Agriculture, US Geological Society, Intrepid Potash financial statements and Green Market regional

quotes.

Simplified Facility Layout

To view an enhanced version of this graphic, please visit:

https://images.newsfilecorp.com/files/11610/267506_51b450a714192872_011full.jpg

OPERATIONS Overview

The Project is strategically located in San Juan County, Utah, in the United States close to agricultural

markets. Utah has been ranked a top US State in terms of business and trade opportunities and mine

development - which has supported the Company's advancement of construction planning and

permitting.

The United States is heavily reliant on potash imports, sourcing more than 95% of its annual demand

from Canada, the former Soviet Union and the Middle East. By developing the Project, Sage Potash has

the opportunity to become a reliable source of potash for American farmers backstopped by low-cost

and high-quality potash production. Additionally, the Pacific Northwest of the United States has

historically commanded a price premium for potash relative to other domestic potash markets.

Over the life of the Project, we expect to produce an annual average gross margin of 68%, generating an

average of $72 million* of annual free cash flow to finance resource and production expansion and

investor returns.

To view an enhanced version of this graphic, please visit:

https://images.newsfilecorp.com/files/11610/267506_sage%20potash%20fig%203.jpg

Operational Model Assumptions

Items

Units

Annual Steady State Production Years

All Years

Saleable Tonnes of Muriate of Potash (MOP)

mt

300,000

5,630,000

Sales Price

(1)

$/mt

$450

$450

Operating Cost

$/mt

$144

$144

Gross Revenue

$Millions

$135

$2,533

Operating Cost

$Millions

$43

$806

EBITDA*

$Millions

$92

$1,727

Operating Cash Flow*

$Millions

$80

$1,503

Capital Items

$Millions

$10

$327

Free Cash Flow*

$Millions

$75

$1,258

(1)

The sales price of $450 per tonne FOB mine site selected for the economic analysis is based on publicly available information

through the US Department of Agriculture, US Geological Society, Intrepid Potash financial statements and Green Market regional

quotes.

RESOURCE Overview

The Project is underpinned by a significant potash resource located in the Paradox Basin, a geologically

favorable region with a proven history of solution mining. Inferred Resources are derived from Cycle 18's

upper and lower potash horizon, some of the highest quality potash resource globally.

The Technical Report authors have confidence in the classification of the resource as an "inferred

resource" using recent and historical well results, because the Paradox Basin is very well explored with

published maps of the high-grade potash beds, and the 2D seismic showed bedding continuity.

Inferred total potash resource: 298 million mt; a potash deposit that supports the potential for

production and significant future incremental capacity expansion potential.

Inferred potash resource: 118 million mt KCl (42.1%) and 74.8 million mt K

2

O (26.6%)

Upper Potash Bed: 72 million mt KCl (46.1%) and 45.8 million mt K

2

O (29.1%)

Lower Potash Bed: 46 million mt KCl (35.8%) and 29.0 million mt K

2

O (22.6%)

Flat lying potash deposits with up to 7.3 meter potash seams with virtually no carnallite or insoluble

content.

Potential Upper Bed Potash Quantities: 460-530 million mt (25-29% K

O| 40-46% KCl) within

2,400-5,000 meters of Johnson 1 drilled well.

Next Steps

With the completion of the PEA, which includes favorable environmental and cultural study results, Sage

Potash intends to accelerate efforts towards further delineating the resource by converting inferred

resources to measured and indicated resources, and evaluating many of the Project optimization and

upside opportunities. This includes:

Drilling an already permitted exploration well to confirm final cavern concentrations and flow rates

to complete and submit a solution mine plan, upon which the well will be converted into an initial

production well.

Advancing plant and solution mine engineering and plans to support the issuance of the Large

Mine Operations permit.

Advancing commercial initiatives including potential off-take agreements and industry

partnerships.

Progressing logistics and financing for moving the Company's secured plant and equipment into

Utah.

About Sage Potash Corp.

Sage Potash Corp. (TSXV: SAGE) (OTCQB: SGPTF) is a Canadian company dedicated to the

development of its flagship Sage Plain Potash Project, located in the Paradox Basin, Utah. With a large

and high-grade resource base, the Company is advancing toward its goal of establishing a secure and

sustainable domestic potash production platform in the United States. Sage Potash is committed to

food security, environmental stewardship, and creating value for shareholders and stakeholders alike.

For more information, please visit:

www.sagepotash.com

.

On behalf of the Board of Directors

Peter Hogendoorn - Chief Executive Officer; (604) 764-2158

Tim Mizuno - President and Chief Operating Officer

For further information, please contact:

Marcus van der Made

E:

[email protected]

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

policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this

release.

Qualified Person

The scientific and technical information contained in this news release has been reviewed and approved

by Qualified Persons as defined by National Instrument 43-101

Standards of Disclosure for Mineral

Projects

. Qualified Persons are:

Erik Hemstad, Professional Engineer (PE),of RESPEC Company LLC

Dr. Susan B. Patton, RM-SME, of RESPEC Company LLC

Kathy Adams, PEng, PE, of Paterson & Cooke USA Ltd

Dr. R. Nick Gow, QP-MMSA, of Paterson & Cooke USA Ltd

Use of Non-GAAP Financial Measures

This news release contains certain financial measures and ratios that do not have a standardized

meaning prescribed by International Financial Reporting Standards ("IFRS") and may not be

comparable to similar measures presented by other issuers. These non-GAAP measures are provided

as supplemental information and should not be considered in isolation or as a substitute for measures

prepared in accordance with IFRS.

Management uses these measures internally to evaluate operating performance, project economics, and

liquidity, and believes they provide investors with additional insight into the Company's financial and

operational results. However, investors are cautioned that non-GAAP measures do not have any

standardized meaning under IFRS and may differ from similar measures used by other companies.

Cautionary Statement Regarding Forward-Looking Information

This news release contains "forward-looking information" within the meaning of applicable securities

laws relating to the potential development of the Sage Plain Potash Project, including statements

regarding economic potential, future production, permitting, and other matters discussed in the PEA.

Forward-looking information is based on assumptions and involves known and unknown risks and

uncertainties that may cause actual results to differ materially. Sage Potash does not undertake to

update forward-looking information except as required by law. Investors are cautioned that the PEA is

preliminary in nature and includes inferred mineral resources that are considered too speculative

geologically to have economic considerations applied to them that would enable them to be

categorized as mineral reserves, and there is no certainty that the PEA will be realized. The Company

has not defined any mineral reserves for the Project. Mineral resources are not mineral reserves and

do not have demonstrated economic viability.

Note all amounts are denominated in US dollars and metric tonnes.

*Refer to “Use of Non-GAAP Financial Measures” section of this news release for more information.

To view the source version of this press release, please visit

https://www.newsfilecorp.com/release/267506