Ontario’s ambition to turn locally mined lithium into battery-grade material has taken another engineering step forward. Rock Tech Lithium has signed agreements with Siemens Canada covering a Digital Process Twin and specialized engineering support for its planned Red Rock Lithium Converter in northwestern Ontario.
The proposed facility is being designed for annual capacity of up to 32,000 tonnes of lithium carbonate equivalent, potentially creating a significant new link between Canadian mineral production and downstream battery manufacturing. The Siemens work does not mean construction is beginning, nor does it represent a final investment decision. Instead, it moves a partnership announced earlier in 2026 into active technical work as Rock Tech advances a Definitive Feasibility Study that is expected to provide a much clearer picture of the plant’s design, cost and path toward development.
The Siemens Partnership Has Moved From Planning to Engineering
Rock Tech and Siemens Canada first outlined their relationship in March 2026 through a non-binding memorandum of understanding. That agreement established a broader plan to combine Rock Tech’s lithium-processing work with Siemens’ industrial digitalization expertise. The agreements announced September 22 mark what Rock Tech describes as the first implementation phase of that strategy, turning part of the earlier framework into specific engineering work for Red Rock.
Siemens will support the project team in process control, instrumentation and automation architecture while also developing the planned Digital Process Twin. Those areas may sound less dramatic than excavation or construction, but they are fundamental to a large chemical-processing facility. Engineers need to determine how equipment communicates, how processes are controlled and measured, and how the plant responds when operating conditions change. Completing that work during design can help identify technical conflicts before they become costly problems on a physical site.
A Digital Twin Could Test the Plant Before It Exists
The centrepiece of the new arrangement is a Digital Process Twin: a physics-based virtual representation of the converter’s processes, energy flows and material streams. Rock Tech says the model will use information being generated through its ongoing Definitive Feasibility Study, allowing engineers to examine proposed operating conditions before committing major capital to equipment and construction.
Siemens describes industrial digital twins more broadly as evolving virtual models that allow plants, machines and processes to be simulated, tested and optimized before changes are made in the real world. For Red Rock, that could mean examining how different process configurations affect energy consumption, material movement, emissions or reliability. Rock Tech intends the technology to remain useful beyond the current engineering phase, potentially following the project through detailed engineering, construction and eventually operations. In practical terms, problems found inside a simulation are generally easier to address than problems discovered after machinery has already been installed.
The Definitive Feasibility Study Is the Next Major Test
The Red Rock Definitive Feasibility Study began near the end of June 2026 and is currently expected to be completed by mid-December. Rock Tech has described the study as being developed to an engineering depth comparable with FEL3 and has targeted capital-cost accuracy of roughly plus or minus 10%. That represents a much more detailed stage than the project’s earlier scoping work and is intended to help determine whether the converter can progress toward a final investment decision.
Financing is developing alongside the technical work. In April, Rock Tech announced a strategic arrangement under which BMI Group plans to act as an anchor investor, with a proposed investment of C$200 million as part of a broader project-equity structure. The companies also outlined up to C$30 million in initial non-dilutive funding for engineering, environmental, permitting and site-development work. Those plans remain tied to project development milestones rather than representing a completed financing package for construction.
The 32,000-Tonne Target Would Make Red Rock a Large Midstream Project
Rock Tech is designing Red Rock for capacity of up to 32,000 tonnes per year of lithium carbonate equivalent, commonly abbreviated as LCE. The company has said the facility could ultimately produce either lithium carbonate or lithium hydroxide monohydrate, with the final product mix influenced by market demand. Both are important processed forms of lithium used across the battery industry.
To illustrate the proposed scale, Rock Tech estimates that 32,000 tonnes of annual LCE production could provide enough lithium for as many as 900,000 electric vehicles per year. That figure is the company’s estimate rather than an independent vehicle-production forecast, since the amount of lithium required per vehicle varies according to battery size and chemistry. An earlier 2024 scoping study nevertheless showed why the company is pursuing a plant of this size: Red Rock is envisioned not simply as an extension of one mine, but potentially as a regional processing operation capable of accepting Canadian spodumene feedstock and producing higher-value battery chemicals.
Red Rock Brings Existing Industrial Infrastructure to the Plan
The proposed converter would be developed on BMI Group’s industrial property in Red Rock, roughly 100 kilometres east of Thunder Bay and approximately 60 kilometres south of Rock Tech’s Georgia Lake lithium deposit. Rock Tech originally selected the community after assessing numerous potential locations, including sites in Ontario and the northern United States.
The current BMI property covers about 337 acres and already has some of the characteristics that a large processing facility would need. Rock Tech and BMI say the site has access to approximately 120 MW of power capacity, natural gas, roads and CPKC’s transcontinental railway. Earlier plans placed the converter at the former Norampac paper-mill location, giving the development a brownfield-industrial character rather than starting entirely from scratch. Rail access matters in particular because a converter must receive substantial quantities of mineral concentrate, reagents and equipment while eventually moving finished lithium products into North American manufacturing supply chains.
Georgia Lake Could Connect the Mine Directly to the Converter
Rock Tech’s longer-term Ontario strategy goes beyond the Red Rock plant itself. Its wholly owned Georgia Lake project is intended to produce spodumene concentrate, which could become an important source of feedstock for the converter. A 2022 pre-feasibility study envisioned average annual production of about 100,000 tonnes of 6% spodumene concentrate, although the mine remains a development project rather than an operating source today.
A commercial agreement signed in July 2026 added another layer to that plan. Transamine agreed to a seven-year offtake arrangement beginning in 2028, with contracted volumes scheduled to rise from 50,000 dry metric tonnes in the first year to as much as 100,000 tonnes annually afterward. The agreement also contains a framework for up to US$80 million in development prepayment financing. Importantly, it preserves Rock Tech’s ability to redirect material toward Red Rock and convert the arrangement to battery-grade lithium chemicals if the converter reaches operation.
Germany Is Providing Much of the Engineering Blueprint
Rock Tech is not designing Red Rock entirely from a blank sheet of paper. Much of the concept draws from its Guben Converter project in Brandenburg, Germany, where the company has already completed extensive engineering and secured construction and operating permits. Guben is designed for 24,000 tonnes of battery-grade lithium hydroxide production annually, giving Rock Tech an existing process design from which Canadian engineering can be adapted.
That experience has commercial relevance as well. Mercedes-Benz previously agreed to source an average of 10,000 tonnes of battery-grade lithium hydroxide annually from Rock Tech, subject to qualification requirements, for its European battery supply chain. During the earlier Red Rock scoping stage, Rock Tech estimated that as much as 80% of basic engineering from the German converter could potentially be transferred to the Canadian project. The Siemens partnership deepens that connection by combining the German-derived process blueprint with digital modelling and automation engineering specifically adapted for Ontario.
The Opportunity Is Significant, but Major Development Hurdles Remain
Red Rock fits directly into a problem governments have increasingly identified: mining critical minerals does not automatically create a domestic battery supply chain if most refining and processing happens elsewhere. Canada’s current critical-minerals policy emphasizes domestic processing, manufacturing and cooperation with allied countries. Globally, concentration remains unusually high. The International Energy Agency estimated that the world’s three largest lithium-refining countries accounted for 96% of production in 2024.
That gives projects such as Red Rock strategic significance, but it does not guarantee that they will be built. Rock Tech’s own disclosures identify financing, permitting, engineering, construction costs, market conditions and commissioning as continuing risks. The September Siemens agreements strengthen the technical work behind the proposal; they are not themselves a construction decision. The key near-term milestone is therefore the completion of the Definitive Feasibility Study. Its conclusions will help determine whether the planned 32,000-tonne Ontario converter can move from an increasingly detailed industrial concept into a financed and executable project.
