Korea Zinc’s $7.4 Billion US Smelter Project Clears Environmental Review

Korea Zinc’s $7.4 billion plan to build an integrated critical-minerals smelter in Tennessee has cleared a major US environmental review, moving the South Korean metals company closer to the construction stage.

The company said Monday that the US Defense Department had completed a final environmental assessment of Project Crucible under the National Environmental Policy Act. The review resulted in a Finding of No Significant Impact, meaning the department concluded that construction and operation of the proposed complex would not significantly affect the surrounding environment.

The assessment considered a range of potential effects, including air quality, greenhouse gas emissions, water resources, waste, hazardous materials and the project’s socioeconomic impact on nearby communities. The finding is an important regulatory milestone because federal and state authorities can rely on the review as they consider permits and financial support.

Project Crucible is designed to process 11 critical minerals and 12 nonferrous metals, including gold. It is also expected to produce semiconductor-grade sulfuric acid. Korea Zinc plans to apply expertise developed at its Onsan smelter in Ulsan while meeting US environmental requirements at the Tennessee site.

The project reflects efforts by the United States to expand domestic processing capacity for minerals that are important to advanced manufacturing, defense and technology supply chains. For Korea Zinc, the complex would represent a major overseas expansion and a chance to establish a larger role in the US critical-minerals market.

The initiative gained accelerated permitting status in May, when it became the first project designated under the federal FAST-4 program. That designation followed a memorandum of understanding between the Federal Permitting Improvement Steering Council and the state of Tennessee. The program is intended to coordinate reviews by multiple government agencies and speed the development of critical-mineral processing capacity in the United States.

A Korea Zinc official said the environmental finding reflected early engagement with authorities on site selection, design and safeguards. The company also cited expectations from the South Korean and US governments as well as Tennessee officials.

With the broad environmental assessment completed, Korea Zinc said it will proceed with applications for the individual permits required to construct and operate the complex. Those approvals will determine how quickly the company can begin building the facility.