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South America’s lithium supply chain has recently faced a series of disruptions. In Brazil, Sigma Lithium’s Grota do Cirilo mine was ordered by a court to suspend its environmental licences and mining activities amid disputes related to environmental permitting and local communities. In Argentina, extreme winter weather has continued to affect high-altitude mining areas in the northwest, with road access to the Hombre Muerto salar temporarily disrupted and operations at some sites constrained. The immediate causes of these events are different. Sigma is facing risks associated with environmental permitting and community relations, while the disruptions in Argentina highlight the exposure of lithium brine operations to extreme weather, road logistics and infrastructure constraints at high altitude. From the perspective of the global lithium market, however, both developments point to a broader issue: As global lithium supply enters another period of concentrated capacity additions, the key variable is increasingly shifting from how much capacity has been announced to whether that capacity can actually be delivered according to expected timelines and ramp-up curves. Sigma Mining Suspension: Risks Extend from Current Supply to Future Expansion In September, a Brazilian court suspended the environmental licences and mining activities at Sigma Lithium’s Grota do Cirilo project. The dispute primarily concerns the project’s potential impact on the local Baú Quilombola community. The court determined that there was sufficient evidence to suggest that blasting and construction activities could affect the community and requested an independent assessment to further establish the actual distance between the mining operations and the protected community. Grota do Cirilo is currently Sigma’s only core producing asset, with existing annual lithium concentrate capacity of approximately 330,000 mt. Unlike delays at projects that remain under development, the immediate impact of this event is therefore on existing spodumene concentrate supply that has already entered the global trading system. In the short term, the actual supply impact will depend primarily on three variables: the duration of the mining suspension, existing ore and lithium concentrate inventories, and how long those inventories can sustain processing and exports. If the legal and permitting issues are resolved relatively quickly, Sigma may still be able to offset part of the short-term production loss through inventories and subsequent production recovery, limiting the impact on annual global lithium supply. However, if the suspension is prolonged and ore inventories gradually decline, the impact could extend downstream from mining to processing and exports, ultimately reducing the volume of Brazilian spodumene concentrate available to the international market. The medium-term implications deserve even greater attention. For lithium producers pursuing expansion, the stability of environmental permits, community relations and existing operations affects not only current production but potentially the approval, construction and capital deployment schedules of future expansions. The Sigma situation therefore needs to be assessed not only in terms of how many days production remains suspended, but also whether the legal dispute changes the market’s assessment of the deliverability of the company’s future expansion plans. In other words, if the issue is resolved quickly, it would remain primarily a temporary supply disruption. If permitting and community-related issues become prolonged, however, the situation could gradually evolve into a structural execution risk. Extreme Weather in Argentina: Limited Direct Production Losses, but Infrastructure and Project Delivery Risks Exposed Unlike Brazil, where lithium supply is primarily derived from hard-rock operations, Argentina’s incremental lithium supply is largely coming from brine projects. This winter, the Argentine Puna has experienced relatively severe weather conditions. Between July 19 and July 27, winter storms disrupted road access to the Hombre Muerto salar, with heavy snow accumulation on some routes and access temporarily restricted to four-wheel-drive vehicles. Employees and contractors at several mining operations were affected by the road disruptions, while Rio Tinto’s Fénix and Sal de Vida operations implemented precautionary operational suspensions. Significant snowfall returned in August. Some roads leading to the Hombre Muerto salar were again disrupted by snow and adverse weather, requiring continued road clearance and recovery work around the mining area. Based on currently available information, the direct loss of lithium production resulting from these weather events is expected to remain limited. The disruption therefore does not, at this stage, constitute a large-scale production loss capable of materially changing the global lithium balance. However, that does not make the events insignificant from a supply-analysis perspective. The more important issue is that extreme weather is exposing the infrastructure vulnerability behind Argentina’s rapidly growing lithium brine supply. Many Argentine lithium brine projects are located on the Puna plateau at elevations of approximately 3,500–4,500 metres. These operations are far from major cities, rail networks and ports, and both construction and production remain heavily dependent on road transportation. Under these conditions, extreme weather can affect not only the transportation of finished lithium products, but also the movement of equipment, reagents, construction materials and personnel into mining areas. For mature brine operations already operating at stable production levels, several days of road disruption can generally be partially absorbed through inventories and subsequent production recovery. For projects under construction, commissioning or ramp-up, however, the transmission mechanism is considerably longer: Extreme weather → road disruption → restricted movement of personnel and equipment → construction/commissioning delays → delayed ramp-up curve → annual incremental supply falling below the original plan. The key question surrounding Argentina’s weather disruptions is therefore not how many tonnes of lithium carbonate were lost on any particular day, but whether the disruptions alter the timing of incremental supply expected in H2 2026 and 2027. Argentina Enters a Concentrated Expansion Cycle: Ramp-Up Speed Matters More Than Nameplate Capacity The significance of this issue is closely related to the current stage of Argentina’s lithium supply cycle. Over the past several years, multiple Argentine brine projects have completed construction and progressively entered commercial production. The question facing the market is therefore no longer simply whether these projects can reach first production, but how quickly they can reach their design capacity. Cauchari-Olaroz provides a representative example of a project transitioning towards mature operations. The project produced 9,280 mt of lithium carbonate in the second quarter of 2026, with operations already approaching design capacity. At the same time, Stage 2 expansion is progressing, with plans to add 45,000 mtpa of LCE capacity, beginning with a 10,000 mtpa modular DLE facility. The principal risk at Cauchari-Olaroz has therefore gradually shifted away from the ramp-up of its initial capacity towards the execution and delivery of Stage 2. Centenario-Ratones remains at a more typical ramp-up stage. The project has design capacity of 24,000 mtpa LCE. It produced approximately 6,700 mt LCE in 2025, while capacity utilisation had reached approximately 90% by June 2026. Eramet is targeting production close to full capacity by the end of 2026. For projects at this stage, even if adverse weather does not result in a significant outright production stoppage, disruptions to operational stability can still create a gap between actual annual output and nameplate capacity. Meanwhile, Rio Tinto’s lithium portfolio in Argentina is rapidly entering a new phase of supply growth. Fénix 1B and Sal de Vida have both achieved first production, with Sal de Vida carrying design capacity of approximately 15,000 mtpa. The larger Rincon project is under construction, targeting approximately 60,000 mtpa of battery-grade lithium carbonate capacity. Production is planned to begin in 2028, followed by an expected ramp-up period of approximately three years to reach full capacity. For Argentina, therefore, the decisive factor determining incremental supply over the coming years is not simply the combined nameplate capacity of these projects, but their actual commissioning dates, the pace at which utilisation rates increase, and the time required to reach stable commercial production. The recent developments demonstrate that lithium supply risks in South America are becoming increasingly differentiated. Sigma represents the risk that existing supply may temporarily exit the market. Argentina’s large pipeline of new and expanding brine projects represents a different risk: future supply already incorporated into market expectations may arrive later than anticipated. Both ultimately affect the global lithium supply-demand balance, but through very different transmission mechanisms. The former directly affects near-term physical availability and could influence spodumene concentrate trade flows as well as the distribution of margins between miners and lithium converters. The latter primarily affects the incremental supply curve embedded in the medium-term global lithium balance. Global Lithium Supply Analysis Is Shifting from Nameplate Capacity to Risk-Adjusted Supply Over the past several years, global lithium supply analysis has largely focused on resource size, planned capacity, commissioning schedules and corporate expansion plans. However, as a growing number of projects move from planning into construction and production, simply adding together announced design capacities according to company commissioning schedules is becoming increasingly insufficient to accurately forecast actual supply growth. A project planning to add 50,000 mt LCE of capacity does not necessarily mean that the full 50,000 mt will enter the market in its first year of operation. A project must progress through a series of stages: Permitting → Financing/FID → Construction → Commissioning → Ramp-up → Stable operations → Logistics and sales. A disruption at any of these stages can result in actual supply falling below the amount implied by nameplate capacity. The nature of these constraints also varies significantly by region. Hard-rock operations in Brazil need to account for environmental permitting, community relations and operational stability. Argentine brine projects face high-altitude infrastructure constraints, weather exposure, brine-system performance, new processing technologies such as DLE and ramp-up execution. African projects additionally face road and port logistics, domestic processing requirements and changes in export policies. Some greenfield projects remain sensitive to lithium prices, financing availability and changes in capital expenditure. Future global lithium supply forecasting therefore needs to move beyond nameplate capacity towards risk-adjusted supply. At the project level, this can be expressed as: Risk-Adjusted Supply = Base-Case Production Forecast × Delivery Probability Delivery probability should not be treated as a static assumption. It should be dynamically adjusted according to permitting, financing, construction progress, technology and ramp-up performance, logistics and weather exposure, and operational stability. Following the Brazilian court’s suspension of Sigma’s mining activities, for example, the project’s nameplate capacity remains unchanged, but the probability of delivering the previously expected near-term supply should decline. If the suspension is quickly lifted, the corresponding risk weighting can subsequently be restored. Similarly, Argentine brine projects do not need to formally reduce their nameplate capacity for supply forecasts to change. If weather, road access or ramp-up issues persist, actual supply expectations for the following one or two quarters may need to be adjusted accordingly. For Lithium Prices, the Key Question Is Whether Supply Already Priced In by the Market Needs to Be Revised Down From the perspective of the global lithium balance, the suspension of a single Sigma operation and one period of severe winter weather in Argentina are not, by themselves, sufficient to change the broader direction of global lithium supply growth. This distinction is important when separating fundamental impact from short-term market sentiment. If Sigma resumes production relatively quickly and the impact of Argentine weather remains concentrated on short-term logistics, the effect of the two events on the annual global lithium balance should remain limited. Their price impact would be more likely to manifest as a temporary supply-risk premium. The implications would be considerably different, however, if these events prove symptomatic of broader project-execution challenges. The global lithium market has already incorporated substantial additional resource supply expected between 2026 and 2028. As a result, the marginal impact of another newly announced project is declining, while the marginal impact of a project already embedded in supply expectations being delayed, ramping up below expectations or suspending production may be increasing. In other words: The market increasingly needs to trade not only how much new capacity is being added, but how much of the incremental production already expected can actually be delivered. This is the broader significance of the recent Sigma disruption and extreme weather events in Argentina. Neither development currently represents a turning point for the global lithium supply outlook. However, both reinforce an important point: the global lithium industry does not lack announced resource capacity. What will ultimately determine the supply-demand balance in 2027 and beyond is the pace at which this capacity can be converted into stable, saleable production. As the market gradually shifts from trading “capacity additions” to trading “actual production additions,” supply deliverability may become an increasingly important variable in global lithium fundamentals and price formation. Lesley Yang SMM New Energy Analyst yangle@smm.cn