South32 (ASX:S32) has secured the last major federal approval needed to advance its Hermosa zinc-silver project in Arizona, with the US Forest Service issuing a final Record of Decision in July. The sign-off completes environmental reviews for key infrastructure at the site and clears the way for construction on what will become a significant new source of zinc, manganese and silver. For ASX investors, it removes years of permitting uncertainty from one of South32’s flagship growth assets.
A Decade-Long Permitting Hurdle Cleared
Hermosa was the first project accepted into the US government’s FAST-41 program, designed to speed up reviews for strategically important infrastructure. South32 moved from initial filing to final approval in just over two years, far faster than the decade-plus timelines that have historically dogged US mine permitting. The decision covers access roads, a dry-stack tailings facility and transmission infrastructure on Coronado National Forest land, with full production still targeted for 2029. The roughly US$4.7 billion project adds to a wider run of base metals strength this year, including the momentum covered in our report on zinc’s four-year high.
Fresh Supply as Silver Trades Near Record Highs
The timing stands out. Silver has pushed well above US$60 an ounce in August, extending a rally driven by investment demand and industrial consumption tied to solar panels and electricity grids, per data tracked by the Silver Institute. Analysts have repeatedly flagged a widening structural supply deficit as a key support for prices. Hermosa will not shift that balance overnight given its 2029 timeline, but it is a rare example of significant new mine supply advancing at a time when global project pipelines remain thin.
What It Means for ASX Investors
Hermosa reinforces South32 as a diversified base and critical minerals producer, distinct from pure-play silver developers on the ASX such as Silver Mines and its Bowdens project in New South Wales. Silver itself was only added to the US 2025 List of Critical Minerals alongside zinc and manganese, and the approval signals continued US support for domestic supply chains, a trend Australia is mirroring through its own critical minerals strategy. Investors watching ASX silver and base metals names may take the milestone as a reminder that permitting risk, not just price, remains key to how quickly new supply reaches the market.
This article is general information and market commentary only. It does not take into account your personal objectives, financial situation or needs, and it is not financial product advice. Commodity and mining equities carry a high degree of risk, including price volatility and the potential loss of capital. Consider seeking advice from a licensed financial adviser and read our full Disclaimer before making any investment decision.