Mr. Mirco Wojnarowicz reports

ROCK TECH LITHIUM ANNOUNCES TOTAL CAPITAL COSTS OF APPROXIMATELY CAD$600 MILLION FOR RED ROCK CONVERTER BASED ON PRELIMINARY DFS RESULTS

Rock Tech Lithium Inc. has released preliminary results from the continuing definitive feasibility study for its Red Rock converter in Ontario, which commenced in June, 2026.

The preliminary DFS results indicate total capital costs of $596-million, comprising $546-million of direct capital costs and $50-million of owner's costs, with a tolerance of plus or minus 20 per cent. The study is based on a production capacity of about 30,000 tonnes per annum of lithium salts.

Rock Tech's chief executive officer, 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 is being conducted by China CEC Engineering Corp., an industry-leading, international EPC engineering service provider in lithium conversion, with extensive experience in the development and construction of battery material 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 in progress and is expected to be completed by the end of 2026. The results of the final DFS are expected to provide further details on capital and operating costs, project economics, technical assumptions, 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.

About Rock Tech Lithium Inc.

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 lithium hydroxide monohydrate per year), and Ontario, Canada (up to 32,000 tonnes lithium carbonate equivalent 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 European Union Critical Raw Materials Act.

The raw materials for Rock Tech's converter projects are intended to be sourced exclusively from verifiably environmental, social and governance 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, policy-makers 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, policy-makers and community groups, and is committed to open communication and the highest environmental standards.

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