The U.S. Forest Service has approved the Hermosa Project, a $2 billion zinc and manganese mine owned by South32 (ASX:S32) located in the Patagonia Mountains of Arizona. The federal authorization, finalized in late 2024, allows the company to proceed with the development of a facility designated as a "critical minerals" project by the U.S. government due to its potential to supply materials essential for electric vehicle batteries and renewable energy infrastructure.
Why is the Hermosa Project considered significant?
The Hermosa Project is the first mining operation to be processed under the U.S. government’s FAST-41 permitting framework, which is designed to expedite the federal review of major infrastructure projects. According to the U.S. Department of the Interior, the mine is expected to become a primary domestic source of manganese, a mineral currently imported by the United States. Manganese is a key component in the cathodes of lithium-ion batteries. By securing a domestic supply chain, the project aligns with the Biden-Harris administration’s goals to reduce reliance on foreign markets for minerals necessary for the energy transition.
What are the environmental and community concerns?
The approval follows years of debate regarding the project’s impact on the Coronado National Forest. Local environmental groups and community organizations, such as the Patagonia Area Resource Alliance, have expressed concerns regarding water usage and potential pollution in the Santa Cruz River watershed.
To mitigate these risks, South32 has committed to a "net-zero" water impact strategy. The company’s official project documentation states that the mine will utilize closed-loop water systems and advanced filtration technologies to prevent discharge into local groundwater. The Forest Service’s final Record of Decision mandates strict adherence to air and water quality standards, requiring continuous monitoring and reporting to federal regulators throughout the life of the mine.
How does this project compare to other domestic mining efforts?
The Hermosa Project represents a shift in how the U.S. handles mining permits for critical minerals. While traditional mining projects often face decade-long review periods, the FAST-41 designation allowed for a more integrated approach between federal agencies.
| Feature | Hermosa Project (Arizona) | Industry Standard |
|---|---|---|
| Primary Mineral | Manganese/Zinc | Varies |
| Permitting Path | FAST-41 (Expedited) | Standard NEPA Process |
| Project Status | Approved (2024) | Typically 7–10 years |
| Strategic Goal | Domestic Battery Supply | Commodity Production |
What happens next for South32?
With the federal permit in hand, South32 must now navigate state-level environmental permits and finalized internal investment decisions. The company has indicated that the project will create hundreds of direct jobs in Santa Cruz County and provide a significant economic boost to the region. Construction of the underground facility is expected to span several years, with the company aiming to reach full production capacity by the end of the decade. Investors are currently monitoring the company’s capital expenditure updates to see how the $2 billion budget will be phased through the development timeline.