Indium Metal (ITO for Displays + Semiconductors)

Korea Zinc Co., Ltd. (Seoul; KRX: 010130; ~$9B revenue) is the world's largest single-site zinc, lead, and silver smelter operator and the world's largest non-Chinese indium refiner. Indium is recovered as a byproduct at its Onsan smelter in Ulsan, South Korea — the only facility in Korea with an indium processing line. Korea Zinc produces ~150 tonnes of indium annually at 99.999% purity (vacuum-packed 5-kg bars), meeting roughly 11% of global demand outside China. About 90% of Korea Zinc's indium output is exported to the US, Japan, and Taiwan — making it the primary indium supplier for US and Taiwanese display/semiconductor manufacturers seeking non-Chinese supply. The Onsan smelter also produces gallium and antimony; Korea Zinc has invested heavily to diversify into critical minerals as a strategic counterweight to Chinese dominance.

DOWA Holdings Co., Ltd. (Tokyo; TSE: 5714; formerly Dowa Mining) is Japan's largest indium producer, commanding an estimated 12% global market share. DOWA produces high-purity indium (up to 99.9999% / 6N) at its Kosaka Smelting & Refining facility in Akita Prefecture, Japan — recovering indium as a byproduct of zinc, copper, and lead smelting from Kuroko-type polymetallic ore. DOWA also processes electronic scrap (e-waste) at its Akita Eco Smelting subsidiary for secondary indium recovery. DOWA Electronics Materials (a DOWA subsidiary) was Japan's largest indium supplier for ITO sputtering targets as of 2010 and remains a primary Japanese supplier to flat-panel display manufacturers. DOWA's dual primary+secondary recovery model gives it resilience against zinc market downturns.

Young Poong Corporation (Seoul; KRX: 000670) is a Korean zinc smelter operator whose Seokpo smelter in Bonghwa-gun, Gyeongsangbuk-do is the world's sixth-largest zinc producer and one of Korea's indium producers. The Seokpo facility has annual indium production capacity of approximately 100 tonnes. Young Poong is a significant shareholder in Korea Zinc (and involved in a contentious governance dispute in 2024-2025). The Seokpo smelter was ordered to suspend operations for 58 days (February 26–April 24, 2026) by the Supreme Court of Korea due to cadmium wastewater discharge violations into the Nakdong River — the facility has accumulated 76 environmental violations since 2013. This suspension created a notable short-term indium supply disruption.

Teck Resources Limited (Vancouver; NYSE: TECK; ~$9B revenue) is one of the world's largest integrated zinc producers and a major Western indium producer. Indium is recovered as a byproduct at Teck's Trail Operations in Trail, British Columbia — one of the largest integrated zinc and lead smelting complexes in the world. Teck produces 99.995%-minimum-purity indium at Trail with an annual capacity of approximately 75 tonnes, representing ~22% of US import supply. Teck has expanded its indium processing capability to meet ITO manufacturer demand. Trail Operations processes zinc concentrates from Teck's Red Dog mine (Alaska) and third-party sources. Teck sold its steelmaking coal business to Glencore in 2024, sharpening its focus on copper and zinc — both critical mineral supply chains.

Zhuzhou Smelter Group Co., Ltd. (Zhuzhou, Hunan Province; state-owned) is one of China's largest and historically most significant indium producers. The company comprehensively recovers indium, antimony, cadmium, gold, silver, and copper as byproducts of zinc smelting operations with annual zinc capacity of 300,000 tonnes. Zhuzhou halted indium ingot production during a major plant relocation (2018-2019) when both its old and new zinc smelting facilities were simultaneously in transition, creating a notable Chinese supply disruption. The relocated facility operates in the Shuikoushan copper-lead-zinc industrial base. As part of the broader cluster of ~20 Chinese companies that collectively control 60% of global indium supply, Zhuzhou's operations benefit from proximity to Hunan Province's polymetallic ore supply and integrated Chinese zinc supply chains.

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.

Asahi Holdings, Inc. (Tokyo; TSE: 5857) is a Japanese precious and rare metals recycler that recovers indium from various electronic manufacturing scrap streams — including ITO target manufacturing waste, LCD panel scrap, and compound semiconductor manufacturing residues. Founded in 1952 and headquartered in Tokyo, Asahi operates the Bando Plant in Ibaraki Prefecture for precious/rare metals recovery. Asahi Holdings is a secondary indium producer (recycled rather than primary mine byproduct), making it an important component of the circular economy for ITO — recovering indium from used/scrap targets that can contain 70-80% of the original indium after sputtering, which is economically valuable at current indium prices (~$200-300/kg). Japan has developed significant secondary indium recovery infrastructure as a national strategy to reduce primary indium import dependency.