G50 Corp Validates Gallium Processing at Golconda with Gold and Silver Recovery

G50 Corp Validates Low-Cost Gallium Processing at Golconda with Gold and Silver Co-Product Potential

G50 Corp Limited (ASX: G50) has reported Phase 2 metallurgical test work from the Golconda Project in Arizona, with results indicating that oxidised surface material may be upgraded into gallium-rich and precious metal concentrates using conventional mineral processing methods. According to the ASX announcement dated 15 July 2026, the latest work also supports optionality to recover a combined gallium-gold-silver concentrate or separate gallium and precious metal concentrates.

For investors, the significance lies in two areas. First, the processing methods tested are standard, relatively simple techniques such as screening, desliming, and flotation. Second, the oxide-zone results are reported to be broadly consistent with the company's April 2026 non-oxide metallurgical programme, suggesting a similar processing approach may apply across different material types at Golconda.

What the Phase 2 Metallurgical Test Work Showed

The current test programme was completed at SGS Lakefield in Canada during Q2 and Q3 2026. It assessed four oxidised surface samples from the Little Jimmy area at Golconda, using 10 kg to 20 kg sub-samples taken from a larger 2,200 kg outcrop and trench sampling campaign.

The company stated that the work was proof-of-concept in nature. Its purpose was to determine whether oxide material behaves similarly to the non-oxide material tested earlier and whether a common flowsheet may be suitable.

How Was Gallium Upgraded in the Fine Material?

According to the quarterly-style metallurgical update in the ASX release, gallium is strongly concentrated in the fine-grained fraction of the oxide material. When particles finer than 20 microns were isolated through screening and desliming:

• Gallium grades were upgraded by 1.5x to 2.0x from feedstock
• Gallium recovery ranged from 63% to 87%
• Mass pull was 40% to 60%

This matters because desliming is a relatively low-intensity processing step. If fine material contains a large proportion of the gallium, it may allow early-stage upgrading without complex downstream treatment.

Flotation tests on the deslimed material produced a further gallium upgrade of 2x to 5x relative to flotation feed. Recovery ranged from 40% to 50%, with approximately 10% to 20% mass pull relative to the flotation feed.

Furthermore, the company stated the flotation work demonstrated selectivity for gallium-bearing minerals, with potential for cleaner flotation stages to increase concentrate grade in future test work.

Gold and Silver Also Reported to Concentrates

Gold and silver were reported to be distributed more broadly across particle sizes than gallium. Even so, the test work indicated that a meaningful portion of precious metals reports into the same fine fraction as the gallium.

According to G50:

• Approximately 30% to 70% of gold reported to the sub-20-micron fraction
• Approximately 60% of silver reported to the same fine fraction

That suggests potential co-product credits if the company pursues a gallium-focused concentrate route.

Separate sulphide flotation tests on deslimed material also generated a gold-silver concentrate. In those tests:

• Gold grades were upgraded by about 10x
• Silver grades were upgraded by about 5x
• Gold recoveries ranged from 70% to 90%
• Silver recoveries ranged from 30% to 50%

The lower silver recovery was identified by the company as an area for further work. In the samples tested, much of the silver reported to slimes before flotation, and additional stages may be considered to improve recovery.

Key Metallurgical Results at a Glance

Why Consistency Between Oxide and Non-Oxide Material Matters

The most important takeaway from the announcement may not be the headline upgrade ratios alone. It is the consistency reported between the April 2026 non-oxide test work and the current oxide-zone programme.

When similar processing responses are seen across different material types, it may simplify future plant design and reduce development uncertainty. In the report, G50 stated that the conceptual processing flowsheet remains unchanged and applicable after the latest programme.

That is relevant because metallurgical variability is often a major issue in project development. If oxide and non-oxide zones can potentially be treated using related processing steps, the project may have greater practical flexibility as it moves through larger-scale testing.

The company outlined two possible product pathways:

1. A combined gallium, gold and silver concentrate
2. Separate gallium and precious metal concentrates

Both pathways are based on conventional mineral processing methods rather than novel chemical extraction systems.

G50 stated that the latest oxide-zone results are broadly consistent with the April 2026 non-oxide programme, and that the current value proposition and development strategy for gallium at Golconda remain unchanged.

Understanding Desliming and Flotation in Plain Language

Metallurgical updates can be technical, so it is useful to break down the key terms for clarity.

What Is Desliming?

Desliming is the removal or separation of very fine particles from coarser material. At Golconda, the company reported that gallium tends to occur in muscovite, a soft mica mineral that breaks into fine particles during crushing and grinding.

Because of that behaviour, separating out the finest material — especially particles smaller than 20 microns — may also separate a large portion of the gallium. This is one reason the company views desliming as a low-cost pathway worth testing further.

What Is Flotation?

Flotation is a standard mineral processing method used across the mining industry. Finely ground rock is mixed with water and reagents, then air is introduced. Specific minerals attach to bubbles and float to the surface, where they can be collected as a concentrate.

At Golconda, flotation was tested for both gallium-bearing minerals after desliming, and gold and silver-bearing sulphide minerals. For investors, the practical point is straightforward. Conventional methods are generally better understood, with more available technical expertise and commercial equipment options than highly specialised treatment routes.

Why Does This Matter in Project Assessment?

A project can show strong mineralisation, but if treatment is complex or costly, development becomes harder to justify. Metallurgical results that point to standard processing routes may improve the likelihood that future development studies can be based on practical plant designs.

That does not guarantee commercial outcomes. However, it can reduce one element of early-stage technical uncertainty.

Golconda's Gallium Story Has Been Building Over Several Years

The latest test work sits within a broader technical progression at Golconda. G50 has been building the gallium case through drilling, mineralogy and now multiple stages of metallurgy.

Key Development Milestones

The muscovite-hosted gallium finding is central to the processing concept. Because muscovite can break down into fine particles relatively easily, it helps explain why particle-size separation appears to capture gallium effectively.

Why Gallium Is Attracting Investor Attention

Gallium is used in compound semiconductors, including materials such as gallium nitride and gallium arsenide. These are used in electronics applications linked to communications, defence systems, satellites and electric vehicles.

Global supply is currently dominated by by-product output, particularly from aluminium processing. That structure has increased market focus on supply diversity, especially following Chinese export controls introduced in 2023, as referenced in wider market discussion.

Golconda's location in Arizona, United States gives it relevance in the context of potential domestic US gallium supply. In the ASX announcement, G50 stated that work to date supports evaluation of a domestic source from Arizona aimed at the American market.

It is important, however, to stay close to the wording of the announcement. G50 has not reported government funding, project designation, or offtake agreements. The investment interest instead rests on the project's geological setting, metallurgy, and commodity mix.

Multi-Commodity Angle Adds Another Layer to the Investment Case

Golconda is not being presented solely as a gallium opportunity. The project also contains gold, silver, zinc and lead mineralisation, and the current metallurgical work points to potential co-recovery of precious metals.

That matters because multi-commodity projects can offer more than one possible revenue stream if later studies support development. The company has previously referenced drilling results including:

• 35 m at 5.2 g/t gold
• 6 m at 546 g/t silver
• 308 m at 28.6 g/t gallium

Those figures come from previous ASX announcements referenced by the company in the latest release. Together, they frame Golconda as a project where gallium may complement an existing precious and base metals setting rather than stand alone.

What Comes Next After the July 2026 Update?

The ASX announcement outlined a defined next phase of technical work. This is important because proof-of-concept metallurgy is only an early step in project development.

According to the report, pending and planned work includes:

• Ongoing mineralogy, liberation and geochemistry studies on oxide material
• Further metallurgical test work to improve representativity across the deposit
• Variability testing across different zones
• Assessment of impurity-to-gallium ratios in potential concentrates compared with commercially available gallium products
• Potential additional flotation stages to improve silver recovery and potentially increase gallium concentrate grade
• Additional drilling and sampling, where supported by current study outcomes

The company also noted that the balance of the 2,200 kg bulk sample remains in secure storage for future larger-scale test programmes.

Why Investors May Continue to Watch G50

The July 2026 metallurgical update advances Golconda from mineralogical interpretation toward a more practical processing concept. That is often a meaningful transition in the evaluation of an early-stage minerals project.

The current results do not establish a Mineral Resource or Ore Reserve, and the company's announcement clearly states that further metallurgical, geological and economic studies are required. Even so, the consistency between oxide and non-oxide test work gives G50 a clearer technical basis for further evaluation.

For investors focused on ASX gallium stocks, critical minerals processing, and US-based multi-commodity development stories, Golconda now has a more defined narrative. The next catalysts are likely to come from variability testing, concentrate quality analysis, and any further drilling that expands the known footprint of mineralisation.

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