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

TORONTO, October 7, 2026 /CNW/ – 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