U.S. Magnesium halts operations in Skull Valley, layoffs impact hundreds

U.S. Magnesium has announced a decision to halt plant operations at its Skull Valley facility near the south shore of the Great Salt Lake in Tooele County. The company said the move, driven by a sharp decline in lithium carbonate prices, has resulted in the layoff of 186 workers.

The company cited “deteriorating market conditions” as the primary reason for the shutdown. Lithium carbonate prices have plummeted by a staggering 90 percent since 2022, severely impacting the economic viability of the operation. The layoff notice, filed with the Utah Department of Workforce Services, detailed a wide range of positions affected, from top-level executives to frontline workers.

The Skull Valley operation produced substantial quantities of magnesium, lithium carbonate and other chemical products. Its location on the Great Salt Lake provides access to concentrated brine, a crucial raw material for its manufacturing processes. The Skull Valley is a rich reserve of magnesium that produces 9,000 metric tons of lithium carbonate annually. The facility is spread across 80,000 acres and utilizes 100 square miles of solar evaporation ponds to concentrate brine that serves as the primary raw material for its manufacturing processes.

U.S. Magnesium’s financial challenges were further compounded by a lawsuit filed by construction company Forgen. Forgen alleges that the company owes over $5.8 million in unpaid invoices and interest. The lawsuit also highlights a potential lien against the property, which could lead to its sale to cover debts.

The plant’s environmental impact has also been a subject of concern. It was designated a Superfund ite in 2008 due to hazardous chemical contamination. A recent federal study revealed that the plant’s emissions contributed to increased particulate matter levels in the Wasatch Front area during winter inversions.

While U.S. Magnesium remains hopeful that the layoffs will be temporary and the plant will resume operations when market conditions improve, the future of the facility remains uncertain. The company’s decision underscores the volatility of the mining and chemical industry, where market fluctuations can have significant consequences for both businesses and communities, industry analysts said.

As the largest primary magnesium producer in North America, U.S. Magnesium has been operating on the Great Salt Lake since 1972.