Rock Tech Lithium Announces Total Capital Costs of Approximately CAD$600 Million for Red Rock Converter based on Preliminary DFS Results

• Preliminary results of the Definitive Feasibility Study ("Preliminary DFS Results") for the Red Rock converter in Ontario indicate total capital costs of approximately CAD$600 million.  
• Preliminary DFS Results are based on a further optimized, industry-proven converter design with an annual production capacity of about 30,000 tonnes of lithium salts.
• Preliminary DFS Results confirm Rock Tech´s chosen path toward cost-competitive, sustainable and clean Lithium salts production in the Western world.
• The results of the final DFS are expected in December 2026.

TORONTO, Oct. 7, 2026 /PRNewswire/ - Rock Tech Lithium Inc. (TSXV: RCK) (OTCQX: RCKTF) (FWB: RJIB) (WKN: A1XF0V) (the "Company" or "Rock Tech") is pleased to announce preliminary results from the ongoing Definitive Feasibility Study ("Preliminary DFS Results") for its Red Rock Converter in Ontario ("Red Rock Converter" or "Project"), which commenced in June 2026.

The Preliminary DFS Results indicate total capital costs of CAD$596 million, comprising CAD$546 million of direct capital costs, and CAD$50 million of owner's costs, with a tolerance of ±20%. The study is based on a production capacity of about 30,000 tonnes per annum of lithium salts.

Rock Tech's CEO Mirco Wojnarowicz commented: "The Preliminary DFS Results are an important decision-making milestone for investing in a modern and scalable lithium production platform in Ontario. They underline that the Red Rock Converter can be built at a highly competitive capital cost – a level not yet achieved within the Western lithium supply chain."

The Definitive Feasibility Study ("DFS") is being conducted by China CEC Engineering Corporation ("CEC"), an industry-leading, international EPC engineering service provider in lithium conversion, with extensive experience in the development and construction of battery materials plants with a combined annual production capacity of more than two million tonnes of battery salts, including plants for BYD, Huayou Cobalt and General Lithium. For localization of the Project CEC will be working with established Canadian partners.

DFS Completion and Project Development Timeline

The DFS remains ongoing and is expected to be completed by the end of 2026. The results of the final DFS (the "Final DFS Results") are expected to provide further details on capital and operating costs, project economics, technical parameters, implementation schedule and financing structure. The Preliminary DFS Results announced today remain subject to the Final DFS Results and further engineering, technical and financial validation by CEC.  Subject to the Final DFS Results and receipt of the required project approvals, construction is currently expected to commence in the second half of 2027.

On behalf of the Company,
Mirco Wojnarowicz
CEO

About Rock Tech Lithium

Rock Tech is enabling the battery age by making the battery industries in Europe and North America more independent and competitive. The Company's goal is to ensure the supply of high-quality, locally produced lithium – supporting a resilient, sustainable, and transparent value chain from mine to battery-grade material.

Rock Tech relies on responsible sourcing, state-of-the-art and proven technologies, and a clear focus on circular economy principles. The Company's lithium converter projects in Guben, Germany (24,000 tonnes LHM per year) and Ontario, Canada (up to 32,000 tonnes LCE per year) form the foundation for a stable and regional supply to the battery and automotive industries. The Guben converter has been recognized as a Strategic Project under the EU Critical Raw Materials Act.

The raw materials for Rock Tech's converter projects are intended to be sourced exclusively from verifiably ESG-compliant suppliers. In Canada, Rock Tech relies, among other sources, on its wholly-owned Georgia Lake Project, which is intended to provide a stable and sustainable supply for the North American market and is being developed in close partnership with local Indigenous communities. By integrating recycled materials, the Company aims to close the local battery loop.

With its facilities, Rock Tech intends to contribute to battery-grade material sovereignty and the achievement of climate targets. The company works in partnership with industry, policymakers, and community groups, and is committed to open communication and the highest environmental standards. With its facilities, Rock Tech makes a central contribution to battery-grade material sovereignty and the achievement of climate targets. The company works in partnership with industry, policymakers, and community groups, and is committed to open communication and the highest environmental standards.

CAUTIONARY NOTE CONCERNING FORWARD-LOOKING INFORMATION

Certain statements contained in this news release constitute "forward-looking information" under applicable securities laws and are referred to herein as "forward-looking statements". All statements, other than statements of historical fact, which address events, results, outcomes or developments that the Company expects to occur are forward-looking statements. When used in this news release, words such as "expects", "expected" "anticipates", "plans", "predicts", "believes", "estimates", "intends", "intended" "targets", "projects", "forecasts", "may", "will", "should", "would", "could" or negative versions thereof and other similar expressions are intended to identify forward-looking statements.

In particular, this news release contains forward-looking information pertaining to: the preliminary results of total and direct capital costs for the Red Rock Converter and the underlying assumptions supporting the updated financing structure, the timing and outcome of the Final DFS Results and the technical and financial validation; the extent to which the Final DFS Results, including capital cost estimates, may differ from the Preliminary DFS Results announced herein; the impact of the cost optimizations on the Project's economics, competitiveness and financing readiness, and the Company's ability to secure project financing on acceptable terms; the anticipated construction timeline, commissioning, and operational start-up of the Red Rock Converter; and the Company's broader business strategy.

Forward-looking information is based on certain assumptions, estimates, expectations and opinions of the Company and, in certain cases, third party experts, that are believed by management of Rock Tech to be reasonable at the time they were made. Forward-looking information is derived utilizing numerous assumptions regarding, among other things: that projected Capital Costs will be realized as anticipated and will not be offset by unforeseen cost increases; the successful execution of design changes, logistics concepts, procurement strategies (including updated supplier quotations), and process optimization steps consistent with permit requirements; the availability, performance and contracting and timing of EPC and other contractors and vendors; the terms of definitive agreements with other strategic partners; the accuracy and stability of technical parameters, throughput, recoveries and other engineering inputs used in the models; the timely completion of the Final DFS Results, detailed engineering and procurement activities; the Company's ability to secure sufficient financing on acceptable terms; the availability of skilled labor, equipment, and materials at projected costs; the stability of commodity prices, exchange rates, and general economic conditions; the absence of material disruptions to supply chains, construction schedules, or permitting processes; the accuracy and reliability of technical data, forecasts, and engineering studies; and that the Preliminary DFS Results, including projected capital costs, will be substantially validated by the Final DFS Results and will not be materially revised as a result of further engineering, technical, financial or procurement review

The forward-looking information in this news release is based on several key assumptions and material factors. The forward-looking information also assumes favorable market conditions for lithium. Forward-looking statements by their nature are based on assumptions and involve known and unknown risks, uncertainties and other factors which may cause the actual results to differ materially from the forward-looking statements, including general business, economic, competitive, political and social uncertainties; delay or failure to receive regulatory approvals; changes in project plans; the risk that regulatory approvals may not be obtained on the anticipated timeline or at all; and risks, uncertainties and other factors discussed in the Company's public disclosure documents available under its profile on SEDAR+. No assurances can be given that any of the events anticipated by the forward-looking statements will transpire or occur, and the Company cautions the reader not to place undue reliance upon any such forward-looking statements. The Company does not intend, nor does it assume any obligation to update or revise any of the forward-looking statements, whether as a result of new information, changes in assumptions, future events or otherwise, except to the extent required by applicable law.

SOURCE Rock Tech Lithium Inc.