Buffalo Potash Completes Second Horizontal Well and Spuds Third at Disley Initial Production Module

Highlights

Completed second of three horizontal wells as part of the second phase (Horizontal Line-Drive drilling) of development at the Disley Initial Production Module;

Successfully installed packers for KCl-rich brine collection along the horizontal production well;

Successfully made contact with approximately 95% of the target clay seam, confirming successful placement of the well; and

Spudded third and final horizontal well as part of the second phase.

Saskatoon, Saskatchewan--(Newsfile Corp. - September 8, 2026) - Buffalo Potash Corporation (TSXV: BUFF) (OTCQB: BLPTF) (FSE: VU5) (the " Company " or " Buffalo ") is pleased to announce that it has advanced the second phase (Horizontal Line-Drive drilling) of the buildout of the Initial Production Module (" IPM "), located at the Company's flagship Disley property in Saskatchewan (the " Disley Project "). The Company has completed the second of three planned horizontal wells (the " 4D15-10 Well " or " Producer Well 2 "), installed packers along that well for KCl-rich brine collection, and again made contact with approximately 95% of the target clay seam, and spudded the third horizontal well (the "1 D15-10 Well " or the " Injector Well ").

Mr. Quinton Hardage, P.Eng., PMP, President and Chief Operating Officer of the Company, commented: "Successfully laying each of the horizontal production wells for our mining plane along the identified basal Belle Plaine clay seam is key to being able to establish efficient fluid connection between wells. To now have both producer wells come in ahead of schedule and under budget, while making contact with 95% of the target clay seam is a fantastic outcome and gives our team a lot of confidence as we begin drilling our third and final horizontal leg - the horizontal injection well. I couldn't be more pleased with our team and the standard they have set during our IPM development drilling program."

Phase 2: Horizontal Line-Drive Drilling

The second phase of the IPM buildout involves drilling three horizontal wells that form the downhole infrastructure used to establish a solution mining plane in connection with Buffalo's patented Horizontal Line-Drive mining method at the IPM. Two of the three wells are designed to be producer wells that bring KCl-rich brine to surface after traversing the mining plane from the center injector well that introduces NaCl brine sourced from the previously drilled 15-10 source well into the mining plane (see Figure 1).

Completed drilling of second horizontal (4D15-10; Producer Well 2) - Drilling was completed at the 4D15-10 Well (Producer Well 2), a 565-m lateral well and the second of the three horizontal legs of the underground IPM design. This well successfully made contact with approximately 95% of the target clay seam along the well path, which is important for the success of Phase 2, as the clay seam is the horizon along which hydraulic connection will be obtained between wells and along which the mining plane is established. Achieving this amount of contact confirms accurate placement of the lateral well within the target production horizon. By injecting NaCl brine from the Injector Well, Buffalo intends to first establish pressure communication along the clay seam, then clean out the clay along the seam and connect brine flow to Producer Well 1, creating surface area for dissolution of KCl in the overlying sylvite rock (see Figure 1).

This is the second successive horizontal well that has achieved 95% contact with the target clay seam, following Buffalo's recent success at its first horizontal well ( See the Company's Aug 26, 2026 Release )

Packer installation on second horizontal well (4D15-10; Producer Well 2) - The Company has successfully installed an 11-stage packer system along Producer Well 2. The packers are designed to act as collection points for KCl-rich brine that has crossed the mining plane from the center Injector Well and is then pumped to surface. Packer installation is a vital function of Buffalo's downhole infrastructure, operating as the mechanism for controlling the flow of brine across the mining plane (see Figure 1).

Commencement of third horizontal well (1D15-10; Injector Well) - The Company has spudded the 1D15-10 Well (Injector Well), the third of three horizontal wells, which is intended to serve in the IPM as the injection well in the IPM that injects NaCl-rich brine from surface into the mining plane. (see Figure 1).

Figure 1: Disley Initial Production Module Design

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Disley Project Development Plan

The IPM is designed to produce 125,000 tonnes per annum (" TPA ") of soluble-grade potash and is the first of three planned solution mining facilities at the Disley Project. The IPM has a lower initial CAPEX requirement compared to the full Disley Project build-out and is targeted to reach first production in Q1 2027. At full build-out comprising the IPM and two 500,000 TPA mines (" Disley East " and " Disley West "), the Disley Project would be expected to produce up to 1,125,000 TPA of potash, as contemplated in Buffalo's preliminary economic assessment titled "NI 43-101 Preliminary Economic Assessment Technical Report on the Disley Potash Project, Saskatchewan, Canada" dated May 21, 2026, and effective April 15, 2026 (the " PEA "), a copy of which is available on the Company's SEDAR+ profile at www.sedarplus.ca. On a standalone basis, the PEA estimates a payback period for the IPM of approximately 12 months from the start of production. (2) However, there is no guarantee that the Company will be able to achieve production.

The Company's production decision for the IPM is not based on a feasibility study with mineral reserves demonstrating economic and technical viability, and such production decisions are historically associated with a higher risk of economic and technical failure (see "Note 3 - Production Decision Cautionary Statement").

The IPM is intended to establish initial cash-flow from production at a lower upfront capital cost, while building the operational and technical foundation for full-scale development. Development of the IPM is anticipated to be broken down into five phases:

Source and disposal wells (complete) ;

Horizontal Line-Drive (" HLD ") drilling (ongoing) ;

Brine circulation;

Site development; and

Surface processing.

Disley Project - General Overview

The Disley Project is located approximately 50 kilometers northwest of Regina and covers 10,610 hectares (Crown and Freehold mineral rights). The property is situated immediately to the east of the K+S Bethune potash solution mine and north of the Mosaic Belle Plaine potash solution mine - both of which are among the largest producing potash solution mines in the world. In the opinion of management, the Disley Project is in one of the most favorable areas of Saskatchewan for potash solution mining (see Figure 2) as evidenced by the success of these neighboring operations. (1)

On May 22, 2026, Buffalo released the results of its maiden NI 43-101 Mineral Resource Estimate and PEA for the Disley Project, prepared by Micon International Co Limited. The PEA outlined a phased, modular development plan contemplating full-scale production of up to 1,125,000 TPA of potash across three solution mining facilities, with an estimated after-tax net present value (NPV) of US$1.1B at a discount rate of 8% and estimated internal rate of return (IRR) of 30%. (2) Readers are encouraged to refer to Buffalo's April 27, 2026 and May 22, 2026 news releases and the NI 43-101 technical report filed on SEDAR+ for complete details of the PEA and Mineral Resource Estimate.

Figure 2: The Disley Property Situated Amongst Major Potash Solution Mines (1)

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About Buffalo Potash

Buffalo Potash is an emerging Saskatchewan-based potash developer pursuing a modular approach to selective solution mining through its patented Horizontal Line-Drive (HLD) technology. Buffalo is advancing the Disley Project - located adjacent to two of the most prominent currently producing potash solution mines in the world - with the objective of establishing capital-efficient, lower-impact potash production in one of the world's leading potash jurisdictions.

Qualified Person

The technical information in this news release has been reviewed and approved by Douglas F. Hambley, PhD, PE, P.Eng., PG, an independent consultant to the Company, who is a Qualified Person within the meaning of National Instrument 43-101 - Standards of Disclosure for Mineral Projects . This news release does not contain an updated mineral resource estimate, a new mineral reserve estimate, or economic analysis beyond information previously disclosed in the NI 43-101 technical report for the Disley Project filed under the Company's profile on SEDAR+ at www.sedarplus.ca. Readers are referred to that technical report, prepared by Micon International Co Limited, for complete details of the Mineral Resource Estimate and Preliminary Economic Assessment, including all data verification, methodology, assumptions, and qualifications.

All related and pertinent information has also been reviewed for this news release by Jared Galenzoski, P.Geo, FIMMM as an independent consultant to the Company who is a Qualified Person within the meaning of National Instrument 43-101 - Standards of Disclosure for Mineral Projects . Mr. Galenzoski is an expert in several potash-related fields including the drilling of potash horizontal wells and solution mining operations.

Contact

Steve Halabura P.Geo. | Chief Executive Officer & Director Email: steve@buffalopotash.ca | Phone: 1-306-220-7715 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.

Notes

(1) The K+S Bethune potash solution mine and the Mosaic Belle Plaine potash solution mine (together, the " Adjacent Properties ") may each be considered an "adjacent property" (within the meaning of NI 43-101) to the Company's Disley Project. The Company has no interest in either of the Adjacent Properties. The Company believes this context is useful in illustrating the proven endowment of the district, while noting that mineralization on adjacent or nearby properties is not indicative of mineralization on the Company's Disley Project. There is no guarantee that the Disley Project will yield comparable results to either of these mines.

(2) The PEA was prepared by Micon International Co Limited in accordance with National Instrument 43-101 Standards of Disclosure for Mineral Projects and is preliminary in nature. The PEA includes inferred mineral resources, which are considered too speculative geologically to have the modifying factors and economic considerations applied to them that would enable them to be categorized as mineral reserves. Mineral resources that are not mineral reserves do not have demonstrated economic viability. There is no certainty that the results of the PEA will be realized. Readers are encouraged to read the technical report filed under the Company's profile on SEDAR+ at www.sedarplus.ca in its entirety, including all qualifications, assumptions, and exclusions that relate to the PEA.

(3) Production Decision Cautionary Statement : The Company's decision to proceed with development of the IPM is not based on a feasibility study of mineral reserves demonstrating economic and technical viability. No mineral reserves have been established at the Disley Project, and the PEA is preliminary in nature (see Note 2). Historically, mineral projects advanced to production without first establishing mineral reserves supported by a feasibility study have a higher risk of economic and technical failure. Specific risks associated with the Company's production decision include, but are not limited to: 1) grade, continuity, or thickness of mineralization that differs from the Mineral Resource Estimate; 2) performance of the Company's Horizontal Line-Drive mining method, which has not been operated at commercial scale, that is not as anticipated; 3) recoveries, production rates, or capital and operating costs that differ materially from the PEA; and 4) production during the IPM that does not become sustainable or profitable, which would materially and adversely affect the Company's ability to generate revenue and cash flow.

Forward-Looking Information

This news release contains "forward-looking information" and "forward-looking statements" (collectively, "forward-looking information") within the meaning of applicable Canadian securities legislation. Forward-looking information is generally identifiable by the use of words such as "believes," "may," "plans," "will," "anticipates," "intends," "could," "estimates," "expects," "forecasts," "projects," or similar expressions, and the negative of such expressions.

Forward-looking information in this news release includes, but is not limited to, statements regarding: the timing, sequencing, and completion of the IPM development plan, including the drilling of the source, disposal, and horizontal wells, the development of the mining plane, site development, and the installation and commissioning of processing equipment; the Company's intention to inject NaCl brine from the Injector Well to clean out the clay along the target clay seam and connect brine flow to the producer wells, thereby creating surface area for the dissolution of KCl in the adjacent rock; the anticipated completion of the 1D15-10 Injector Well, and the completion of the three-well Horizontal Line-Drive drilling phase; the intended function of the installed packers to serve as collection points that produce KCl-rich brine to surface after it crosses the mining plane; the establishment of a solution mining plane at the IPM using Buffalo's patented Horizontal Line-Drive mining method; the IPM's designed production capacity of 125,000 TPA of soluble-grade potash and the anticipated payback period for the IPM; the anticipated timing of first production from the IPM; the anticipated timing and phasing of construction and commercial production for the IPM, Disley East, and Disley West; the preparation, timing, and expected benefits of a concurrent feasibility study for the full build-out of the Disley Project; the results, assumptions, and projections contained in or derived from the Mineral Resource Estimate and PEA for the Disley Project, including projected production rates and timing of production; expectations regarding the Disley Project's potential for solution mining; the Company's broader development plans and strategy for the Disley Project; and the fact that the Company's production decision for the IPM is not based on a feasibility study of mineral reserves demonstrating economic and technical viability, and the associated increased risk of economic and technical failure.

Forward-looking information is based on management's reasonable assumptions, estimates, analysis, and opinions made in light of its experience, perception of historical trends, current conditions, and expected future developments, as well as other factors that management believes are relevant and reasonable in the circumstances as of the date such statements are made. These assumptions include, but are not limited to, assumptions regarding geological continuity, potash grade and thickness, the applicability of historical data, the performance of solution mining methods, costs of production, the availability of services and equipment, the receipt of required permits and approvals, and the availability of financing on acceptable terms.

Forward-looking information is subject to known and unknown risks, uncertainties, and other factors that may cause actual results, performance, or achievements of the Company to differ materially from those expressed or implied by such forward-looking information. Such risks and uncertainties include, but are not limited to: the inherent uncertainty of PEA-level studies and the possibility that actual capital costs, operating costs, and production rates differ materially from estimates; risks related to exploration and development activities; risks related to the timing and completion of lease construction, rig mobilization, and drilling operations, including the availability and performance of drilling contractors, equipment, and services; uncertainty in geological interpretation; risks related to the development, commissioning, and operation of novel mining technology; risks inherent to solution mining operations and new or emerging technologies; regulatory approvals and permitting timelines; commodity price volatility; availability of capital; and general economic, market, and business conditions.

Although the Company has attempted to identify important factors that could cause actual results to differ materially from those contained in forward-looking information, there may be other factors that cause results not to be as anticipated, estimated, or intended. There can be no assurance that such information will prove to be accurate, as actual results and future events may differ materially from those anticipated in such forward-looking information. Accordingly, readers should not place undue reliance on forward-looking information. The forward-looking information contained herein is made as of the date of this news release, and the Company disclaims any obligation to update or revise such information, except as required by applicable securities laws.

To view the source version of this press release, please visit https://www.newsfilecorp.com/release/313321

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September 8, 2026 - 4:00 AM PDT

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