No countries meet the strict criteria for “Indium-Producing Countries.”
The request calls for a country-by-country list of places that directly produce indium with verifiable, primary-production data. Find none because indium is almost never mined as a primary metal. Recoverable indium occurs at trace levels in zinc and lead ores and shows up only when smelters and refiners recover it as a byproduct or from recycled material. National mine inventories therefore do not contain standalone indium mines to list.
Understand the technical reasons. Indium concentrates in sphalerite and other zinc-bearing minerals, so recovery depends on zinc-smelting circuits and the economics of byproduct recovery. Refining often happens in countries different from the ore source. Reporting practices further obscure country-level mine output: most authoritative datasets report refined indium or byproduct recovery by refinery or country of refinement, not primary indium mining. Near matches include refined-production reports that name countries with big smelting sectors (for example China, Japan, South Korea, Belgium, Canada) and companies or smelters such as Indium Corporation, Korea Zinc, and major zinc refiners — but these represent refining or recovery, not primary indium mines.
Use related lists instead. Look for “refined indium production by country” in USGS or BGS yearbooks, rankings of major zinc-producing countries (the primary source of recoverable indium), inventories of major refineries and companies that recover indium, and analyses of recycling and supply risk. Explore those alternatives to get the country-level supply picture you need.
