Supply Chain

Indium Supply Chain: From Mine to Market

Indium is produced almost entirely as a byproduct of zinc refining. China produces ~57% of global primary indium, with South Korea, Japan, and Canada as other significant sources. Zinc smelter residues containing indium are leached, cemented, and electrolytically refined. The dominant use is in ITO sputtering targets for transparent conductive coatings on displays. During ITO sputtering, only ~30% of the target material is deposited on the display substrate; the remaining 70% is collected and recycled, giving indium one of the highest recycling rates of any critical mineral. InP semiconductor wafers for fiber optic applications represent a smaller but strategically important market. Supply is constrained by zinc production economics rather than indium demand.

Production Geography

Global Indium production is led by China, which accounts for approximately 57% of world output, followed by South Korea. The full list of major producing nations includes China, South Korea, Japan, Canada. This geographic concentration means that disruptions in key producing regions can have outsized impacts on global supply and pricing.

Extraction Methods

Indium is extracted using the following primary methods:

• Byproduct of zinc refining
• Recycling of ITO sputtering targets

Processing and Intermediate Products

Indium is primarily sourced from Sphalerite (zinc sulfide) containing indium. After extraction, the raw material undergoes multiple processing steps including beneficiation, chemical treatment, and refining to reach the purity levels required by downstream industries. Typical ore grades range from Byproduct - 10-100 ppm in zinc ore.

Key Supply Chain Participants

The Indium supply chain involves these major companies:

Supply Chain Vulnerabilities

Key vulnerabilities in the Indium supply chain include concentration of 57% of production in China, limited processing capacity diversification, and long lead times for new mining projects. The high supply risk rating reflects the severity of these concentration risks and the difficulty of rapidly establishing alternative supply sources.