Narryer Metals Eyes 17% Grade Zones Early as Rosewood Scoping Study Nears Completion
Key Takeaways
- AMC Consultants' mine optimisation confirms a 22–35 year mine life across all four throughput scenarios, with mine sequencing designed to prioritise zones grading 17% HM — materially above most global HMS operations — in the early years of production.
- Metallurgical testwork by Mineral Technologies demonstrated that a high-quality leucoxene product (99.2% HM, 66.4% TiO2) can be produced through wet concentration alone, potentially eliminating the dry separation stage and reducing capital and operating costs.
- The wet concentrator flowsheet achieved 81% recovery of +53µm VHM to final products, with 78.5% recovered to the leucoxene product and 2.5% to a non-magnetic concentrate.
- Indicated Mineral Resource accounts for 73–85% of scheduled material across all scenarios, with the resource only partially depleted — leaving meaningful upside for future mine life extension.
- Upcoming work is expected to upgrade a significant portion of the Rosewood Resource to the Measured classification (highest JORC confidence tier), further de-risking the project ahead of Scoping Study completion.
Rosewood Scoping Study advances as high-grade access strategy takes shape
PTR Minerals has released dual results from two key technical workstreams feeding into its Rosewood Scoping Study: a preliminary mine optimisation and scheduling study by AMC Consultants, and initial metallurgical testwork completed by Mineral Technologies. Together, these results demonstrate the potential to access zones grading 17% heavy mineral (HM), of which more than 92% is Valuable Heavy Mineral (VHM), in the early years of mine life — positioning Rosewood as one of the higher-grade Heavy Mineral Sands (HMS) projects globally.
The Scoping Study is well advanced, with principal technical workstreams substantially complete. Current activities are focused on integrating results into the Project’s financial model.
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Study results: what the numbers show
Mine optimisation — long lives, early high-grade access
AMC Consultants evaluated four processing throughput scenarios using a Revenue Factor of 0.5 (RF50). Revenue Factor is a metric used in pit optimisation to test sensitivity to economic assumptions relative to the base case — at RF50, the study applies 50% of the base case revenue while maintaining the same cost assumptions, making it a conservative test of pit economics.
The consistent finding across all four scenarios is that mine sequence design can be structured to prioritise higher-grade material in the early years of production, maximising initial cashflows. The quality and size of the Rosewood Resource also means that throughput can be scaled over time to meet market demand.
| Metric | Range |
|---|---|
| Indicated Mineral Resource scheduled | 73% – 85% |
| Inferred Mineral Resource scheduled | 15% – 27% |
| Average LOM Plant Feed Grade (% HM) | 12% – 16% |
| Mine Life | 22 – 35 years |
A mine life range of 22 to 35 years across all throughput scenarios at RF50 underscores the quality of the underlying resource. Importantly, these scenarios only deplete part of the total Resource, leaving meaningful upside for future mine life extension.
The ability to sequence higher-grade material early in the mine life directly reduces payback risk. Getting to high-value tonnes faster means the project can generate stronger cashflows before capital has fully been recovered.
Metallurgical testwork — simpler flowsheet, lower capital potential
Mineral Technologies tested a 3-tonne bulk sample (RM04) and demonstrated that a high-quality leucoxene product can be produced through wet concentration alone, without the additional dry separation stage previously contemplated. Wet concentration uses water-based processes to separate heavier mineral particles from lighter material — eliminating the dry stage removes the need for additional drying and downstream processing equipment.
The leucoxene product assay results from this testwork are as follows:
- D50: 356µm
- HM: 99.2%
- TiO2: 66.4%
- Fe2O3: 24.7%
- SiO2: 2.52%
- U + Th: 90ppm (low deleterious elements, indicating strong product quality)
The testwork supported a wet concentrator flowsheet achieving 81% recovery of +53 µm VHM to final products, comprising 78.5% recovered to the leucoxene product and 2.5% recovered to a non-magnetic concentrate.
Eliminating the dry separation stage has the potential to reduce capital requirements, operating costs (particularly energy consumption associated with drying and downstream processing) and overall process complexity. PTR has noted that all processing options, including dry separation, remain under evaluation as testwork continues.
What is a heavy mineral sands project and why does grade matter?
Heavy mineral sands (HMS) deposits are concentrations of dense, commercially valuable minerals found in ancient beach or river sediment layers. They are typically mined using open pit methods, where material is dug up, mixed with water to form a slurry, and pumped through a wet concentrator that separates the heavier minerals from the lighter sand. The resulting heavy mineral concentrate is then processed into end products like leucoxene.
A key factor in an HMS project is feed grade — that is, how much heavy mineral (HM%) exists per tonne of material processed. Higher grade means more valuable mineral extracted per tonne, which directly lowers the cost per unit of product and improves project economics.
Most HMS projects globally operate at grades well below 17% HM. Rosewood’s high-grade zones sit materially above that level, and the mine optimisation work has confirmed the potential to access those zones from the start of operations. Earlier access to higher-grade tonnes translates to stronger initial cashflows and faster capital payback.
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Next steps as Scoping Study moves toward completion
The path forward for PTR involves several concurrent workstreams:
- Finalise remaining Scoping Study workstreams
- Integrate all technical results into the Project’s financial model
- Continue metallurgical testwork to further optimise the processing flowsheet
- Complete preparation of product samples for dispatch to potential customers
Work planned for the coming months is also expected to upgrade a significant portion of the Rosewood Resource to the Measured classification — the highest confidence tier under the JORC Code — further de-risking potential future mining inventory.
Rob Sennitt, Managing Director, PTR Minerals
“The ability to mine the extremely high-grade zones at Rosewood in the early years of an operation could have a significant impact on the financial returns.”
The combination of long mine life across all throughput scenarios, early high-grade sequencing, and a potentially simplified flowsheet provides a meaningful foundation for the Scoping Study’s financial model. PTR notes that the mine optimisation scenarios are preliminary in nature, and there is no certainty that further evaluation will result in the determination of Ore Reserves or the disclosure of production targets.
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