Sage Potash Corp.'s Updated Mineral Resource Estimate Delivers 226 Million Tonnes at 41.36% KCl in Measured & Indicated and an Additional 545.4 Million Tonnes at 41.53% KCl in Inferred

The updated estimate introduces measured and indicated resource categories alongside a larger inferred resource.

Rhea-AI Summary

Sage Potash (OTCQB: SGPTF) expanded its Sage Plain potash resource estimate in Utah following completion of its Summer 2026 drilling program. The estimate adds measured and indicated categories totaling 226.1 million tonnes. Measured resources are 54.3 million tonnes grading 41.31% potassium chloride (KCl), and indicated resources are 171.8 million tonnes grading 41.37% KCl. Inferred resources total 545.4 million tonnes at 41.53% KCl, compared with 298.1 million tonnes in the 2025 estimate.

The estimate assumes 100% extraction and no plant loss; mining and economic deductions remain unapplied. A 25% area deduction accounts for unknown seismic anomalies because no 3D seismic has been completed. Sage plans a Pre-Feasibility Study to assess financial viability, supported by engineering, environmental and permitting work, and studies of power, water and transportation.

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Hollow bars mark forward-looking points. How the balance works

Positive

• Moderate pointMeasured resources added: 54.3 million tonnes grading 41.31% KCl.
• Moderate pointIndicated resources added: 171.8 million tonnes grading 41.37% KCl.
• Moderate pointInferred resources reached 545.4 million tonnes at 41.53% KCl, versus 298.1 million tonnes in 2025.
• Minor point. Forward-looking: it has not happened yet and may not happen.Pre-Feasibility Study planned to assess project financial viability and potential expansion beyond the preliminary economic assessment.
• Minor point. Forward-looking: it has not happened yet and may not happen.Solution-mining engineering and process design planned to determine mining and plant throughput capacity.

2 minor points

• Minor point. Forward-looking: it has not happened yet and may not happen.Environmental studies and permitting activities planned to continue for the new throughput capacity design.
• Minor point. Forward-looking: it has not happened yet and may not happen.Power, water and transportation studies planned to evaluate trade-offs and availability for the site.

Negative

• Moderate point100% extraction and 0% plant loss underpin gross resources; mining losses and economic cutoffs remain unapplied.
• Minor point25% area deduction addresses unknown seismic anomalies; no 3D seismic has been completed.

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Vancouver, British Columbia and Salt Lake City, Utah--(Newsfile Corp. - October 19, 2026) - Sage Potash Corp. (TSXV: SAGE) (OTCQB: SGPTF) ("Sage Potash" or the "Company") is pleased to announce a significant upgrade to its potash resource estimates after the successful completion of its Summer 2026 drill program at the Company's flagship Sage Plain Potash Project in Utah's Paradox Basin. The new Mineral Resource Estimate ("MRE"), as prepared by independent engineering firm RESPEC LLP, materially expands the inferred potash resource and allows the addition of measured and indicated resource categories.

Summary

• Measured Potash Resource of 54.3 million tonnes grading 41.31% KCl.

• Indicated Potash Resource of 171.8 million tonnes grading 41.37% KCl

• Inferred Potash Resource of 545.4million tonnes grading 41.53% KCl

Executive Comment

"Completion of the Summer 2026 drilling of the Peterson 1 Well and the resulting Mineral Resource Estimate mark a major milestone for the Company," said Pat Varas, CEO of Sage Potash. "The results validate the project's extensive potash resources and confirm the Paradox Basin's potential to support a scalable, high-quality potash operation. The upgraded estimate provides a strong foundation for our next core objective: completing a Pre-Feasibility Study to demonstrate the viability and economic metrics of the Sage Plain Potash Project. We will now focus on optimizing the mining and processing plans, including the potential to scale up the project substantially from the preliminary economic assessment reported in September 2025."

Resource Estimate

The Summer 2026 drilling of the Peterson 1 Well delivered high-grade thick intervals of both the Upper and Lower Cycle 18 potash beds. The new data confirms consistent lateral continuity of potash horizons, confirmation of high-grades and impressive thicknesses for solution mining.

Table 1.0 - Sage Plain Project Resource Estimate

Cycle 18 Member	Classification	Area  (km2)	Area with Exclusions (km2)8,9	Thickness  (m)	Average KCl Grade  (%11)	In-Place Sylvinite Tonnage (MMT)1,2,3,4	Average Carnallite Content  (%)	Average Insoluble Content  (%)
Upper 18	Measured	3.05	2.29	7.2	40.73	33.9	0.09	0.47
Lower 18	Measured	3.05	2.29	4.3	42.27	20.4	0.01	0.42
	Total Measured5					54.3
Upper 18	Indicated	9.64	7.23	7.1	40.88	106.8	0.09	0.48
Lower 18	Indicated	9.64	7.23	4.3	42.17	65.0	0.01	0.42
	Total Indicated6					171.8
	Total Measure and Indicated					226.1
Upper 18	Inferred	30.56	22.92	7.1	41.17	336.9	0.09	0.48
Lower 18	Inferred	30.56	22.92	4.4	42.11	208.5	0.01	0.42
	Total Inferred7,10					545.4
	Total Resource					771.5

 

1. MMT = Million Metric Tonnes.
2. Density of Sylvinite = 2.07 tonnes/m³.
3. In-Place Sylvinite is based on Area x Thickness.
4. Gross Resource based on 100% extraction ratio and 0% plant loss.
5. Measured Resource radius of influence is 0-750m.
6. Indicated Resource radius of influence is 750 - 2,000 m.
7. Inferred Resource radius of influence is 2,000 - 4,000 m.
8. Exclusions or deductions for unknown seismic anomalies are 25% of the area as no 3D seismic has been completed
9. The following deductions are anticipated, but not yet applied: A) Mining Parameter deductions for extraction ratio and cavern or plan loss; B) Economic Cut-offs from a project specific analysis. The appropriate deductions values are anticipated as outputs from further studies.
10. Potash Bed Inferred Resource uses a 5% K₂O cutoff to define the upper and lower contacts.
11. Average KCl Grades are the weighted average for the interval thickness based on core recovered and Gamma ray readings in instances of core removal for geomechanical testing or core losses (Johnson 1 hole Lower Bed only and eight 30 cm sections form Peterson 1 Well).

The upgraded resource estimate provides an overall 259% increase in tonnage compared to the resource estimate in the Preliminary Economic Assessment Technical Report (dated November6, 2025, with an effective date of September 8, 2025, and available on www.sedarplus.ca under the Company's profile) as shown in Table 2.

Table 2.0 - Sage Plain Project Resource Estimate 2026 and 2025 Comparison

Cycle 18 Member	Classification	In-Place Sylvinite Tonnage (MMT)
		2026	2025
Upper 18	Measured	33.9	-
Lower 18	Measured	20.4	-
	Total Measured	54.3	-
Upper 18	Indicated	106.8	-
Lower 18	Indicated	65.0	-
	Total Indicated	171.8	-
	Total Measured and Indicated	226.1	-
Upper 18	Inferred	336.9	169.9
Lower 18	Inferred	208.5	128.2
	Total Inferred	545.4	298.1

 

Resource classifications and estimates have been determined by RESPEC LLC of Grand Junction Colorado. RESPEC is the Qualified Professional (QP) as required by National Instrument 43-101, Standards of Disclosure for Mineral Projects ("NI 43-101"). Mr. Erik Hemstad - Principal Consultant with RESPEC commented, "RESPEC has been involved with the Sage Plain Project for many years and is pleased to provide this mineral resource estimate. We are also pleased to provide ongoing input on geological interpretation and appropriate potash solution mining techniques for this basin in general and the Sage Plain Project specifically. The Sage Plain Project is located within the heart of the Paradox Basin and is showing very strong potential as a potash producer in Utah."

Next Steps

The Company will publish and file on Sedar+ a Technical Report in accordance with the requirements of NI43-101 within 45 days of this news release. Thereafter, the next phases of work will include:

• Advancement of solution-mining engineering and process design including determination of solution mining and plant throughput capacity

• Continued environmental study work and permitting activities for the new throughput capacity design

• Ongoing collaboration with regional stakeholders and local communities

• Trade-off and availability studies for the provision of power, water and transportation logistics to the Sage Plain site.

The Company plans to summarize the above facets and demonstrate the financial viability of the project in a Pre-Feasibility Study.

Qualified Person

The scientific and technical information contained in this news release has been reviewed and approved by Eric Hemstad, PE, a Qualified Person as defined by NI 43-101. Mr. Hemstad is a Consulting PE at RESPEC Company, LLC and is independent of Sage Potash.

About Sage Potash Corp.

Sage Potash Corp. (TSXV: SAGE) (OTCQB: SGPTF) is 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.

On Behalf of the Board of Directors,

J. Patricio Varas, CEO and Director

1 (236) 521-1521

Website: www.sagepotash.com

For media inquiries, please contact:

Marcus van der Made, Investor Relations

IR@sagepotash.com

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.

Forward-Looking Statements

This news release contains "forward-looking information" and "forward-looking statements" within the meaning of applicable securities legislation. The forward-looking statements herein are made as of the date of this news release only, and the Company does not assume any obligation to update or revise them to reflect new information, estimates or opinions, future events or results or otherwise, except as required by applicable law. Often, but not always, forward-looking statements can be identified by the use of words such as "plans", "expects", "is expected", "budgets", "scheduled", "estimates", "forecasts", "predicts", "projects", "intends", "targets", "aims", "anticipates" or "believes" or variations (including negative variations) of such words and phrases or may be identified by statements to the effect that certain actions "may", "could", "should", "would", "might" or "will" be taken, occur or be achieved. Forward-looking information in this news release includes, but is not limited to, statements with respect to future events or future performance of Sage Potash, including but not limited to: filing on Sedar+ within 45 days of the date hereof a technical report to support the contents of this news release; advancement of solution mining engineering and process design including determination of solution mining and plant throughput capacity; completing environmental study work and permitting activities for the new throughput capacity design; continuing ongoing collaboration with regional stakeholders and local communities; completion of trade-off and availability studies for the provision of power, water and transportation logistics to the Sage Plain site; completion of a Pre-Feasibility Study to demonstrate the viability and economic metrics of Sage Plain Potash Project; and establishing a secure and sustainable domestic potash production platform in the United States. Forward-looking statements and information are subject to various known and unknown risks and uncertainties, many of which are beyond the ability of the Company to control or predict, that may cause the Company's actual results, performance or achievements to be materially different from those expressed or implied thereby, and are developed based on assumptions about such risks, uncertainties and other factors set out herein, including, but not limited to, the risk factors set out under the heading "Risk Factors and Uncertainties" in the Company's Management's Discussion & Analysis available for review under the Company's profile at www.sedarplus.ca. Such forward-looking information represents management's best judgement based on information currently available. No forward-looking statement can be guaranteed and actual future results may vary materially. Accordingly, readers are advised not to place undue reliance on forward-looking statements or information.

To view the source version of this press release, please visit https://www.newsfilecorp.com/release/319702

FAQ

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What are Sage Potash's updated measured and indicated resources at Sage Plain?

Sage Plain has 226.1 million tonnes of measured and indicated resources. Measured resources comprise 54.3 million tonnes grading 41.31% KCl, while indicated resources comprise 171.8 million tonnes grading 41.37% KCl.

How much did Sage Potash's inferred resource increase from 2025?

Sage Plain's inferred resource increased from 298.1 million tonnes in 2025 to 545.4 million tonnes in the updated estimate. The updated inferred resource grades 41.53% KCl.

When will Sage Potash file the technical report for its updated resource estimate?

Sage Potash will publish and file the technical report on SEDAR+ within 45 days of October 19, 2026. The report will follow National Instrument 43-101 requirements for mineral project disclosure.