Overview
Nestled in the resource-rich James Bay region of Québec, Canada, the Shaakichiuwaanaan Project represents a major step forward in North America’s critical minerals supply chain. Owned and operated by PMET Resources Inc. (formerly Patriot Battery Metals Inc.), this advanced-stage project is centered on the high-grade CV5 spodumene pegmatite, a significant source of lithium essential for the global transition to electric vehicles and renewable energy storage. The recently completed NI 43-101 Technical Report and Feasibility Study, dated October 2025, outlines a robust, large-scale operation designed for long-term, sustainable production. The project’s cornerstone is a state-of-the-art mineral processing facility engineered to produce a high-quality, battery-grade spodumene concentrate. With a planned annual throughput of 5.1 million tonnes, the facility is a testament to modern mineral processing design, employing a sophisticated, multi-stage Dense Media Separation (DMS) circuit to efficiently upgrade the ore. This project not only underscores Québec’s position as a leading mining jurisdiction but also highlights the industry’s shift towards more energy-efficient and environmentally considered processing technologies to meet the growing demand for lithium.
Key Process Stages
The Shaakichiuwaanaan processing plant is engineered as a gravity-based beneficiation facility, specifically designed to exploit the coarse-grained nature of the spodumene mineralization. The circuit avoids energy-intensive fine grinding and chemical flotation, instead relying on physical property differences. The entire operation is structured around two identical, parallel process trains for redundancy and operational flexibility, each capable of handling 50% of the total plant feed. The journey from run-of-mine (ROM) ore to final spodumene concentrate involves several meticulously designed stages.
- Stage 1: Run-of-Mine Handling & Three-Stage Crushing Circuit: ROM ore, with a top size of 1 meter, is delivered by truck. It can be fed directly to the primary crusher or stockpiled (with a 21-day live capacity). The crushing circuit reduces the ore to a target size of 9.5 mm top size (P100) to prepare it for DMS. This involves a primary jaw crusher, followed by secondary and tertiary cone crushers in closed circuit with vibrating screens to ensure precise size control.
- Stage 2: DMS Feed Preparation & Classification: The crushed ore is stored in a fine ore stockpile dome, acting as a buffer. It is then meticulously screened to separate it into distinct size fractions optimal for DMS efficiency. Key fractions are: Coarse (-9.5 mm to +3.4 mm), Fine (-3.4 mm to +1.6 mm), and Ultrafine (-1.6 mm to +0.65 mm). Material finer than 0.65 mm is deemed too fine for effective DMS and is bypassed directly to tailings.
- Stage 3: Multi-Stage Dense Media Separation (Core Beneficiation): This is the heart of the concentrator. Each size fraction is processed in dedicated DMS circuits using a ferrosilicon medium. The coarse fraction undergoes a unique two-stage DMS process for higher recovery, the fine and ultrafine fractions are treated in single-stage circuits. The DMS cyclones separate high-density spodumene (sinks) from low-density waste rock (floats) based on a specific gravity cut-point.
- Stage 4: Re-crush and Scavenging DMS Circuit: To maximize recovery, the “middlings” stream from the secondary coarse DMS (material with a SG between ~2.65 and 2.90) is not discarded. It is sent to a High-Pressure Grinding Rolls (HPGR) unit to liberate more spodumene, then re-screened and fed to a dedicated “recrush” DMS circuit for a final upgrade opportunity.
- Stage 5: Magnetic Separation & Final Product Handling: All DMS concentrate streams are combined and passed through high-intensity magnetic separators. This critical step removes iron-bearing minerals to ensure the final spodumene concentrate meets the strict market specification of less than 2% Fe₂O₃. The non-magnetic, cleaned concentrate is dewatered and conveyed to a covered storage pile for load-out.
- Stage 6: Tailings and Bypass Fines Dewatering: All reject streams (DMS floats and the sub-0.65 mm bypass fines) are sent to a thickener and then a belt filter for dewatering. The resulting filter cake, along with coarser rejects, is transported to a tailings storage facility. A portion is earmarked for future use in paste backfill, enhancing the project’s sustainability profile.
Critical Data
The feasibility of the Shaakichiuwaanaan Project is underpinned by a comprehensive set of design criteria and performance metrics. The table below summarizes the key operational and metallurgical parameters extracted from the NI 43-101 Technical Report, providing a clear snapshot of the plant’s intended scale and efficiency.
| Parameter | Value | Unit | Notes |
|---|---|---|---|
| Annual ROM Throughput | 5.1 | Million tonnes per annum (Mtpa) | Nominal design capacity |
| Plant Feed Grade (Li₂O) | 1.31 | % | Average during full production (Years 4-18) |
| Target Concentrate Grade (Li₂O) | 5.50 | % | Product specification |
| Lithium Recovery (at 1.31% feed) | 65.0% (Min) | % | Minimum target; actual modeled recovery is ~69.5% |
| Annual Concentrate Production | 756,087 | tonnes per annum (tpa) | At 5.50% Li₂O grade |
| Concentrator Availability | 85 | % | Equivalent to 7,446 operating hours/year |
| Crushing Plant Availability | 68 | % | Equivalent to 5,957 operating hours/year |
| Target Crushed Product Size (P100) | 9.5 | mm | Top size for DMS feed |
| DMS Feed Size Fractions | Coarse: 56.4%, Fine: 17.0%, Ultrafine: 8.3% | wt.% of plant feed | Remaining 18.2% is bypass fines (<0.65 mm) |
| Key Consumable (DMS Medium) | Ferrosilicon 270D | – | Dense medium for separation |
Additional Interesting Data and Summary
The Shaakichiuwaanaan processing circuit is notable not just for its scale but for its sophisticated application of DMS technology. The decision to use a three-size-fraction DMS plant, including an ultrafine circuit, is a direct response to the ore’s favorable mineralogy—characterized by large, liberated spodumene grains. This design minimizes the “particle size effect” that can hamper recovery in traditional single-fraction DMS plants, contributing to the project’s expected recovery of approximately 69.5% Li₂O, which is considered high for a DMS-only operation. The technical report includes a detailed recovery model, showing recovery as a function of head grade, with a theoretical maximum recovery of 75%. The use of parallel process trains enhances operational flexibility and mitigates risk, allowing one train to be maintained while the other operates.
From a sustainability and economic perspective, the gravity-based DMS process offers significant advantages. It typically has a lower energy footprint compared to flotation circuits and uses water-based, non-toxic reagents (primarily ferrosilicon and flocculant). The project incorporates a comprehensive water management plan, with a dedicated water treatment facility to handle bleed streams and maximize water recycling, a crucial consideration in the James Bay environment. The study also identifies several future optimization opportunities, including the potential integration of ore sorting for high-dilution material and by-product recovery circuits for tantalum, caesium, and rubidium. These avenues could further enhance project economics and resource utilization post start-up.
In summary, the Shaakichiuwaanaan Project’s processing plant, as detailed in the 2025 Feasibility Study, presents a well-engineered, economically robust, and environmentally considered pathway to producing a key battery raw material. Its design reflects current best practices in spodumene processing and positions PMET Resources as a future significant supplier in the North American lithium market.
Source: NI 43-101 Technical Report | Feasibility Study | Project: Shaakichiuwaanaan Project | Date: October 2025
