A Vancouver-based miner is discovering how quickly a domestic U.S. supply-chain project can become exposed to global trade friction. Lithium Americas says tariff exposure tied to construction of the Thacker Pass lithium project in Nevada is now estimated at US$80 million to US$100 million, with most of the impact expected during 2026. The warning arrives as the company pushes through one of the most capital-intensive stages of the build, while keeping its late-2027 mechanical-completion target in place.
Thacker Pass is designed to become a major source of battery-quality lithium carbonate for North American electric vehicles, with General Motors holding a 38% project stake and long-term offtake rights. The cost pressure therefore reaches well beyond one Canadian mining company: it highlights how tariffs, imported equipment, shipping disruptions and labour constraints can complicate efforts to build a more localized EV-battery supply chain.
Tariff Exposure Now Tops Out at US$100 Million
Lithium Americas’ estimate puts tariff exposure at US$80 million to US$100 million, with the majority expected during 2026. That range is narrower than the US$80 million to US$120 million estimate disclosed with its first-quarter results in May, but it represents a meaningful construction cost for a project measured in billions of dollars. The company says actual tariffs incurred through June 30 are reflected in construction costs.
The tariff figure does not stand alone. Lithium Americas also identified reduced open-sea-lane availability, constrained U.S. fabrication capacity, domestic logistics bottlenecks, inflation and a tighter market for skilled labour as pressures on Thacker Pass during the second quarter. That combination shows why industrial projects can face cost escalation even when their end goal is domestic production. The mine may be in Nevada, but its construction supply chain reaches around the world, leaving the project exposed to policy or transportation shocks far beyond the site.
The “Domestic” Project Still Depends on Global Suppliers
The tariff exposure comes from an international list of suppliers. Lithium Americas says its 2026 construction estimate includes potential tariffs on equipment and construction materials sourced from Canada, China, India, the United Arab Emirates, Turkey and the European Union. A project intended to strengthen U.S. lithium independence is dependent on foreign machinery, steel and specialized components during the build-out phase.
There is a buffer. The company estimates roughly 75% of the total project capital cost structure is tied to labour, contractors and other services not expected to be directly affected by tariffs. That limits the portion of the budget immediately exposed to border measures. Even so, the remaining imported component is large enough to produce a nine-figure risk. The episode illustrates a practical constraint on reshoring: domestic mines and processing plants can take years to build, while industrial equipment needed to construct them may still come from global suppliers worldwide.
Construction Is Already Deep Into the Build
Thacker Pass is an advanced proposal waiting for shovels to move. By June 30, detailed engineering had surpassed 95% and procurement had exceeded 80%, according to Lithium Americas. More than 1,600 people were on site, while over 1,500 workers were living at the company’s workforce housing facility in Winnemucca. Management expects staffing to rise above 2,000 during the second half of 2026 as construction approaches its peak.
That progress makes supply-chain disruption more immediate. More than 85% of the structural steel, sourced from the United Arab Emirates, was either in transit or had reached Thacker Pass or a nearby laydown yard. The balance was expected in the third quarter. Lithium Americas and Bechtel rerouted steel through the Port of Jeddah as Middle East disruptions affected normal shipping routes. For workers in northern Nevada, global trade tensions are therefore arriving as physical construction challenges, not abstract policy debates.
The 2026 Spending Forecast Has Not Changed — Yet
Despite the tariff warning, Lithium Americas has not changed its 2026 capital-spending guidance. The company continues to expect Phase 1 capital expenditures of US$1.3 billion to US$1.6 billion this year. As of June 30, about US$1.8 billion of construction capital and other project-related costs had been capitalized, including roughly US$1.6 billion counted toward the project’s existing US$2.93 billion Phase 1 capital estimate.
That stability comes with an important caveat. Lithium Americas has begun preparing a definitive capital estimate that it expects to complete by the end of the third quarter. The update is intended to incorporate current labour requirements, productivity, tariffs, Middle East conflict effects, fuel prices and other inflationary pressures not included in the existing US$2.93 billion technical-report estimate. For investors, that makes the next capital update important. The annual spending range remains intact, but the longer-term construction cost picture is still being recalculated using newer, less forgiving assumptions.
Billions in Financing Provide a Cushion
Lithium Americas is entering the cost-pressure period with substantial financing assembled. At June 30, the company reported about US$1.28 billion in cash and restricted cash, including US$530.3 million held at the Thacker Pass joint-venture level. It had received three advances under its U.S. Department of Energy loan, bringing cumulative draws to US$1.209 billion. The amended federal facility is expected to total about US$2.23 billion.
The company has added flexibility as construction accelerates. In August, it agreed to financing of up to US$175 million in subordinated convertible debentures with an affiliate of Yorkville Advisors, with US$150 million due at the initial closing and another US$25 million potentially available later. Lithium Americas also raised US$68.5 million through an at-the-market share program during the second quarter. Those funding sources do not erase tariff costs, but they reduce the risk that a single cost shock immediately stalls a project entering its most cash-intensive phase.
General Motors Has a Major Stake in What Happens Next
General Motors has exposure to the outcome at Thacker Pass. The automaker acquired a 38% asset-level interest in the project for US$625 million in cash and letters of credit, while Lithium Americas retains the 62% voting interest. GM’s deal included US$430 million in direct cash funding for Phase 1 construction and a US$195 million letter-of-credit facility tied to reserve requirements under the federal loan.
The link goes beyond ownership. GM has a 20-year Phase 1 offtake arrangement that can cover up to 100% of production, subject to its lithium requirements. Phase 1 is designed to produce 40,000 tonnes a year of battery-quality lithium carbonate, with mechanical completion targeted for late 2027 and ramp-up through 2028. Lithium Americas has previously estimated that this scale could support lithium needs for up to 800,000 EVs annually. Cost control at Thacker Pass matters to an automaker seeking a North American battery-material supply.
Washington Still Wants More Lithium Produced at Home
The strategic case for Thacker Pass remains strong even as its construction bill has become harder to predict. The International Energy Agency says lithium demand has been growing by roughly 25% a year over the past two years, driven by electric vehicles and battery storage. Refining remains geographically concentrated, with China the dominant supplier for most key energy minerals. That concentration explains why Western governments continue supporting domestic mining and processing capacity.
Washington has put financial weight behind that strategy. The Department of Energy’s loan for Thacker Pass was originally structured at US$2.26 billion and was later amended to about US$2.23 billion. The project is designed to produce 40,000 tonnes of battery-grade lithium carbonate annually in Phase 1. The tension is clear: the United States wants more critical-mineral production at home, yet the machinery and materials required to build domestic capacity remain exposed to tariffs and international supply disruptions.
Vancouver Sits at the Centre of a Very American Project
For Canada, the Thacker Pass story has a cross-border character. Lithium Americas is headquartered in Vancouver, incorporated in British Columbia and listed in both Toronto and New York, yet its defining asset is a Nevada mine designed around U.S. industrial and energy-security goals. The company’s filings even list Canada among the places supplying equipment and construction materials exposed to potential U.S. tariffs.
Thacker Pass shows how integrated the North American resource economy remains. A Canadian-headquartered company is managing a U.S. mine, an American automaker owns 38% of the project, and the U.S. government is providing multibillion-dollar debt financing. Yet components arrive from several continents. The project is domestic in where the lithium will be mined and processed, but international in how it is being built and financed. For Canadian mining firms pursuing U.S. growth, trade policy can become a project-cost issue even when investment aligns with Washington’s strategic priorities.
Investors Focused on Progress Despite the Cost Warning
Investors appeared willing to look past the tariff number. Lithium Americas shares in Toronto were up about 6.6% at C$4.84 during Thursday trading, according to Dow Jones Market Talk, after the company released its second-quarter update. The positive reaction came even as management highlighted US$80 million to US$100 million of tariff exposure and broader logistics and inflation pressures affecting Thacker Pass.
One reason may be that the update also contained visible construction progress and no change to the late-2027 mechanical-completion target or 2026 capital-spending guidance. The company reported second-quarter net income of US$1.7 million, compared with a US$13.2 million loss a year earlier, although accounting gains and other income played important roles. The stock move should not be read as proof that investors consider the cost risk solved. Rather, it suggests the market was balancing the tariff warning against evidence that procurement, engineering, financing and site work continue to advance.
The Next Capital Estimate Could Be the Bigger Story
The next test is the definitive capital estimate expected by the end of the third quarter. That update should clarify how tariffs, labour productivity, fuel prices, shipping constraints and inflation affect the remaining cost to finish Phase 1. By then, the company expects the remaining structural steel to be delivered, while concrete work is scheduled to be completed during the second half of 2026.
Operational milestones will matter just as much as the revised budget. Lithium Americas expects early commissioning of utilities in individual plants to begin before year-end, and a transload terminal west of Winnemucca is targeted for completion in 2027. Mechanical completion of Phase 1 remains scheduled for late 2027, followed by ramp-up to commercial production through 2028. The US$100 million tariff ceiling is significant, but the bigger question is whether it remains a contained construction surcharge or becomes part of a broader increase in final project cost.
