How G50 Corp’s Sericite Discovery Could Unlock US Gallium Supply

A Mineralogical Breakthrough

G50 Corp Limited has announced a significant advancement in understanding the mineralogy of gallium at its Golconda Gold-Silver-Zinc Project in Arizona. The company’s latest Phase 2 mineralogical study reveals that approximately 85 to 92 percent of the gallium is concentrated within sericite, a type of muscovite mica. This discovery is crucial because it identifies a specific mineral target that can be efficiently concentrated and processed for gallium extraction.

Sericite’s dominance as the gallium host is linked to widespread hydrothermal alteration associated with gold, silver, and zinc mineralisation in the region. This alteration not only enriches gallium but also serves as a positive vector for precious metals, suggesting that gallium and valuable metals coexist within the same geological framework.

Drilling Confirms Robust Gallium Grades

Recent reverse circulation drilling in 2025 has yielded impressive intercepts, with gallium grades consistently ranging between 16.8 to 21.7 grams per tonne over substantial widths, some exceeding 200 meters. These results reinforce the potential scale and continuity of the gallium mineralisation alongside gold, silver, and zinc, underscoring Golconda’s promise as a polymetallic resource.

Such broad, high-grade intercepts are rare and provide a strong foundation for developing a conventional extraction and processing flow sheet. The coarse-grained nature of the host rock and the concentration of gallium in a single mineral phase simplify the metallurgical challenge, potentially reducing costs and complexity.

Strategic Implications for US Supply Chains

Gallium is a critical metal used in electronics, defense, and data center power systems, with global supply chains currently dominated by a few countries. G50 Corp’s progress at Golconda positions the project as a potential domestic source of gallium for the United States, aligning with broader strategic interests to secure supply chains for critical minerals.

To advance commercialisation, G50 Corp has partnered with SGS Lakefield in Canada to conduct hydrometallurgical test work aimed at developing effective methods for concentrating and extracting gallium from sericite concentrates. These efforts are essential to translate mineralogical and drilling success into viable production pathways.

Looking Ahead

G50’s Managing Director, Mark Wallace, highlighted the milestone nature of this breakthrough, emphasizing the combined potential of gallium and precious metals discoveries at Golconda. The company plans further drilling to delineate extensions of the mineralised zones and continue refining metallurgical processes.

While the findings are promising, the true commercial viability will depend on the outcomes of ongoing extraction tests and the ability to scale operations. Nevertheless, Golconda’s emerging profile as a multi-commodity project with strategic importance makes it a compelling story to watch in the evolving critical minerals landscape.