South32 clears $3.3B Arizona mine after NEPA, targets 2029 production

On July 7, the USDA Forest Service issued the final record of decision for the Hermosa Critical Mineral Project in Arizona, completing the National Environmental Policy Act review and clearing the path to construction authorization on September 4. The project, a $3.3 billion mining and processing operation near Tucson, is the first mining venture to move through the FAST-41 permitting framework, a congressional mechanism designed to collapse multi-year federal reviews into a defined timeline. South32 Hermosa, the Australia-based operator, has already constructed about half the mine on private land and committed to producing zinc, silver, manganese, and two other federally designated critical minerals by 2029. The decision matters because it proves that domestic mineral extraction can clear federal review without being permanently trapped in litigation, and it hands the Trump administration a tangible precedent to cite as it pushes 57 additional mining projects through the same pipeline.

The economic bet embedded in this approval is larger than the headline suggests. In April 2026, South32 revised its cost estimate from $2.2 billion to $3.3 billion, a 50 percent increase, and submitted the revised budget anyway. That signal matters more than the dollar figure. Mining companies do not commit $3.3 billion to a jurisdiction where they believe regulatory risk is falling, and they do not accept a 50 percent cost overrun unless the underlying mineral economics have shifted dramatically in their favor. Zinc and manganese prices have climbed on supply tightness in the Pacific region, where Chinese smelters control the refining bottleneck. Hermosa's promise to feed "battery-grade" manganese and high-grade zinc-silver to domestic smelters addresses the real U.S. weakness: the country has mines but almost no processing capacity. Pat Risner, president of South32 Hermosa, framed it directly: "From the beginning, we designed Hermosa to be a different kind of mine," signaling that the project was engineered to serve the domestic supply chain, not the global commodity market.

The permitting mechanism itself is the story. The Forest Service completed its NEPA review and issued the final record of decision in what Coronado National Forest Supervisor Kerwin S. Dewberry called "record time as a FAST-41 project." FAST-41 collapses federal interagency review into fixed milestones with legal deadlines, if an agency misses its window, the clock advances anyway. There is no indefinite renegotiation phase, no perpetual environmental reassessment. Hermosa moved from final environmental analysis to record of decision in months, not years. The final authorization is scheduled for September 4, 2026, which means South32 will have full regulatory clearance within 90 days of the NEPA closure. That velocity is new in critical minerals. For comparison, the Pebble Mine in Alaska spent over a decade in federal review before the Biden administration blocked it. The difference is not that Hermosa faced weaker environmental scrutiny, South32 committed to 135 conservation and mitigation measures negotiated with federal agencies and Tribes, but that the timeline was fixed and enforceable.

The broader competitive picture reveals why this precedent matters. China controls approximately 85-95 percent of global manganese refining capacity and over 60 percent of rare earth processing. Japan and South Korea dominate zinc smelting in the Pacific basin. The U.S. has one primary zinc smelter in the country and secondary recycling operations. Hermosa alone will not fix that gap, the mine produces ore; actual processing still requires new smelters or expanded capacity at existing facilities, a 3- to 5-year capital cycle on its own. But the decision unblocks the supply foundation. If 57 additional mining projects move through FAST-41 on a similar timeline, the ore supply constraint lifts, and the economics of building domestic smelting capacity improve. That is the strategic bet underneath the regulatory decision.

The test now is execution. South32 must submit its final Mine Plan of Operations and financial assurance documents by September 4. Construction will accelerate on both private land and, once the permit issues, on Coronado National Forest land, the access road, tailings facility, and transmission line that NEPA just cleared. The company targets full production by 2029, which means ramping from roughly 50 percent private-land construction to operational output in three years. Environmental groups have criticized the decision as "premature," citing unresolved legal questions, which signals litigation is likely. The September 4 authorization will not be the end of the permitting story, it will be the opening of the litigation phase. What to watch: whether South32 meets its 2029 production date without delay, whether the company actually sources 80 percent of its workforce locally (a political metric Trump will cite), and whether the project triggers successful judicial challenge before ore leaves the site. If Hermosa reaches production on schedule, the 57 projects behind it will have a working proof point. If litigation blocks it, the FAST-41 framework's durability in the courts becomes the constraint instead.