Tellurium Metal (CdTe Solar / Thermoelectric)

European integrated copper group (SDAX: NDA, HQ Hamburg, Germany); world's largest copper recycler and one of Europe's largest copper smelters. After the September 2024 sale of its Buffalo, NY flat-rolled products site to Wieland, Aurubis exited the U.S. connector-strip market to concentrate on primary copper production, recycling, and multimetal recovery. Aurubis Hamburg remains a world-scale refinery (1M+ MT/year cathode output) and continues to supply copper cathode feedstock to strip rollers including Wieland's European facilities. Aurubis Pirdop (Bulgaria) is its primary copper smelter. The company also operates secondary smelters in Belgium (Lünen) and the UK (Swansea). Prior to divestiture, Aurubis Buffalo produced copper and copper alloy strip for electronic connectors, heat exchangers, architectural products, and electrical goods.

Chinese state-owned copper producer (SHEX: 000878; HQ Kunming, Yunnan Province); major Chinese copper smelter/refiner with cathode capacity exceeding 800,000 tonnes per year. Yunnan Copper is the dominant industrial employer in Yunnan Province's copper belt and operates several smelting facilities in the province. The company has diversified internationally, including minority stakes in copper mining projects in the DRC and Myanmar — connecting Chinese refining capacity to African and Southeast Asian ore supply. Yunnan Copper's proximity to Myanmar's Letpadaung copper mine (via cross-border supply) and the sensitive geopolitical context of Sino-Myanmar resource relationships gives Yunnan Copper a unique geopolitical footprint.

Canadian specialty materials company that refines crude tellurium and other minor metals to 5N (99.999%) purity or higher. Primary purifier of raw tellurium from smelters into semiconductor-grade material for CdTe solar cells. Does not mine or smelt; processes crude tellurium purchased from Aurubis, Kennecott, and Asian smelters. TSX: VNP.

Rio Tinto subsidiary operating Bingham Canyon Mine (Utah) -- the world's largest open-pit copper mine -- and associated Garfield copper smelter/refinery. One of the largest US tellurium producers as a copper anode slime byproduct. Also produces gold, silver, molybdenum. Bingham Canyon has been mined since 1906; the pit is visible from space and 1.2 km deep.

Japanese non-ferrous metals and mining company (TSE: 5713, HQ Tokyo); one of the world's oldest mining enterprises — its Besshi Copper Mine in Ehime Prefecture operated from 1691 to 1973, making Sumitomo Metal Mining older than the United States. Today SMM is a leading producer of nickel sulfate for Li-ion battery precursors (NMC/NCA pCAM). SMM operates Coral Bay Nickel Corporation (CBNC) and Taganito HPAL Nickel Corporation (THPAL) in the Philippines — high-pressure acid leach plants that process Philippine laterite nickel ore into mixed sulfide precipitate (MSP), which is then refined into nickel sulfate at the Niihama Nickel Refinery in Ehime Prefecture, Japan. SMM's integrated laterite-to-sulfate pathway (Philippines HPAL → Japan refinery) is one of the most established non-Chinese nickel sulfate supply chains for Korean and Japanese battery manufacturers (Toyota-Panasonic joint venture PPES; Panasonic Energy). SMM is also the world's leading producer of nickel hydroxide for NiMH hybrid vehicle batteries.

Swedish metals and mining company. Revenue ~SEK 80B (2024). Operates Kokkola zinc smelter (Finland, ~315K MT/yr — largest in Europe) and Odda smelter (Norway, ~200K MT/yr). Also mines copper, gold, silver in Scandinavia. Key European galvanizing-grade zinc supplier.