Korea Zinc Tennessee Smelter Gains FAST-41 Support for Critical Minerals Refining

Korea Zinc

Korea Zinc Tennessee smelter plans have gained federal permitting support after the US Permitting Council added Project Crucible to FAST-41 coverage. The designation is intended to speed permitting for the proposed smelting and refining facility in Clarksville, Tennessee.

The Korea Zinc Tennessee smelter would produce 12 non-ferrous metals, including zinc, copper, lead, antimony, gallium and germanium. It would also produce semiconductor-grade sulfuric acid, making the project strategically relevant to metals, chemicals and semiconductor supply chains.

The Korea Zinc Tennessee smelter is significant because it would be the first large-scale domestic zinc refinery built in the US since the 1970s. It also reflects Washington’s effort to rebuild domestic refining capacity for critical minerals and reduce dependence on overseas processing.

Project Crucible is planned as a $7.4bn investment. Korea Zinc announced the project in December in a joint venture with the US commerce and defense departments after acquiring the adjacent East Tennessee and Mid Tennessee mining complexes and the Clarksville smelter from Trafigura-owned Nyrstar.

Project Crucible Targets a Multi-Metal Refining Gap

Project Crucible is designed to process 1.1mn t/yr of raw materials and produce 540,000 t/yr of finished products. Korea Zinc expects to source feedstock mainly from the US and other North American sources.

This feedstock strategy matters because the US has mine supply and scrap flows, but lacks enough large-scale refining and separation capacity for several strategic materials. Project Crucible could help close that midstream gap.

The product mix is especially important. Zinc, copper and lead provide scale, while antimony, gallium and germanium add critical minerals value.

Gallium and germanium are strategically sensitive because they are used in semiconductors, fibre optics, infrared systems, defence electronics and advanced manufacturing. Antimony is also important for flame retardants, ammunition, lead alloys and military applications.

The facility’s semiconductor-grade sulfuric acid output adds another layer of industrial importance. High-purity sulfuric acid is a key chemical input for semiconductor manufacturing and advanced electronics.

Korea Zinc plans to base the facility on its Onsan smelter in South Korea. That gives the project an established technical reference point and strengthens its credibility as a complex multi-metal refining platform.

FAST-41 Status Supports US Industrial Supply Security

FAST-41 coverage gives Project Crucible a more coordinated federal permitting path. The Permitting Council also signed a memorandum of understanding with Tennessee to align federal and state permitting efforts.

The US Department of Defense will primarily oversee permitting for the project. That role underlines the national security importance of domestic critical minerals refining.

Korea Zinc expects construction to begin in 2027. Phased operations are scheduled to start in 2029 with zinc, lead and copper production.

Finished products are expected to move to US customers by rail. This gives the project a domestic logistics route and supports the broader goal of building mine-to-market North American supply chains.

The project fits a wider US strategy. Washington is trying to accelerate permitting, use defence-linked financing and support domestic refining capacity for materials used in semiconductors, defence, energy infrastructure and manufacturing.

For Korea Zinc, the project offers a major entry into US critical minerals processing. For the US, it provides a rare chance to add large-scale refining capacity across both base metals and strategic minor metals.

The Metalnomist Commentary

Project Crucible shows that the US critical minerals challenge is increasingly about refining, not only mining. If Korea Zinc can execute the Tennessee smelter on schedule, it could become one of the most important non-Chinese multi-metal refining assets in North America.