Stellar Shouts Out Boost to Heemskirk Economics on Higher Tin Recoveries

Why It Matters

The recovery uplift de‑risks Heemskirk’s early‑stage economics, making the project more attractive to investors and potential offtake partners. It also strengthens Australia’s position in the global tin supply chain as demand for high‑purity tin rises.

Key Takeaways

• Tin recovery at Queen Hill rose from ~62% to >70%.
• Higher recoveries enable 42‑49% tin concentrate meeting smelter specs.
• Early-stage economics improve, de‑risking Heemskirk pre‑feasibility.
• Severn testwork shows ~75% recovery and 45‑50% concentrate grade.
• New flowsheet adds ore sorting, gravity regrind, magnetic separation.

Pulse Analysis

Tin remains a critical metal for electronics, renewable‑energy storage and emerging technologies, and the market has been tightening as supply constraints hit major producers. Australia, with its stable mining jurisdiction, is poised to capture a larger share of this demand, but project economics must be robust to attract capital. Stellar Resources’ Heemskirk project, sitting on 9.5 Mt of ore at 0.93% tin, has long been viewed as a high‑grade, low‑cost opportunity. The latest metallurgical results, however, shift the narrative from a promising resource to a near‑term cash‑flow generator, as recovery rates climb into the 70% range.

The breakthrough stems from a refined flowsheet that integrates ore sorting, a gravity‑regrind circuit and low‑intensity magnetic separation. By rejecting up to 50% of gangue early, the process reduces grind energy, reagent consumption and tailings volume, delivering a concentrate that consistently meets the 42‑49% tin purity required by Tier‑1 smelters. These technical gains translate directly into higher payable metal, lower operating costs and a stronger net present value in the pre‑feasibility study. Moreover, the Severn deposit’s parallel results—showing roughly 75% recovery and 45‑50% concentrate grade—suggest that the same methodology can be applied across the Heemskirk complex, further diversifying the project’s revenue base.

Beyond the balance sheet, the improved metallurgy strengthens Stellar’s bargaining position with off‑take partners, who are increasingly seeking reliable, high‑grade tin supplies for battery‑grade applications. Early discussions with potential buyers indicate that the new concentrate specifications could command a premium price, especially as global tin prices have risen amid supply shortfalls. Coupled with a Tier‑1 jurisdiction and a clear path to lower environmental impact, Stellar’s advancements position Heemskirk as a benchmark for next‑generation tin projects, potentially accelerating investment and advancing Australia’s strategic role in the critical minerals ecosystem.