Germanium Metal (Semiconductor Grade)

Chinese zinc and germanium producer (SHEX: 600497, HQ Kunming, Yunnan); major integrated zinc miner and smelter in China. Also one of the world's largest germanium producers — germanium is a critical semiconductor material used in fiber optic cables, infrared optics, and solar cells. Yunnan Chihong's position in germanium (a byproduct of zinc smelting) means the same Chinese company that makes zinc for alkaline batteries also produces a large fraction of the world's germanium for telecommunications and defense optics.

Yunnan Germanium Co., Ltd. (Kunming, Yunnan Province China; SZSE: 002428; ~¥3B revenue) is China's largest dedicated germanium producer and world's largest single-company germanium supplier, producing germanium metal, germanium dioxide, and germanium tetrachloride for fiber optic, infrared optical, and electronic applications. Yunnan Germanium's germanium comes primarily from coal fly ash recovery — coal deposits in Yunnan Province contain anomalously high germanium concentrations (0.01-0.1% Ge vs. typical 1-5ppm), making coal processing a viable germanium source. Yunnan Germanium also processes germanium from zinc smelter residues. The company has benefited significantly from China's August 2023 export licensing requirements, as restricted supply raised domestic and contracted international germanium prices while Yunnan Germanium held inventory.

Umicore N.V. (Brussels; Euronext: UMI; ~$4B revenue) is a global specialty materials and recycling company whose Hoboken, Belgium precious metals refinery is a major European indium producer. Umicore recovers indium from complex lead/copper metallurgical residues and dusts at its Hoboken smelter near Antwerp — a unique secondary-metallurgy process that differs from the primary zinc-smelter byproduct route used by most producers. Umicore's indium capacity is ~50 tonnes/year, representing ~3% of global output and making Belgium a meaningful EU indium source. Umicore is also the world's leading recycler of battery materials (cobalt, lithium) and catalysts; indium recovery at Hoboken is one component of a broader complex metals recovery operation. Umicore's Hoboken plant is one of the most technically sophisticated non-ferrous secondary smelters in the world.

Nyrstar NV (Balen, Belgium; subsidiary of Trafigura since 2019) is one of the world's largest zinc smelting groups, operating multiple European zinc smelters that collectively produce indium as a byproduct. Nyrstar's Critical Minerals Recovery program recovers indium across three European smelters: Balen/Pelt (Belgium), Budel (Netherlands), and Auby (France). Nyrstar's Budel zinc smelter — the largest zinc smelter in the Netherlands — was placed on care and maintenance in January 2024 due to high European energy costs, then restarted at reduced capacity in May 2024. Balen (Belgium) is the largest-capacity single Nyrstar site. Nyrstar's combined indium output is modest relative to Asian producers; however, it represents critical European indium supply for domestic ITO manufacturers.