Technical Due Diligence: What Investors Review Before Financing a Lithium Project

Why Due Diligence Determines Where Capital Goes

In the lithium industry, the gap between a promising project and a financeable one is measured by the quality of its information. Technical due diligence is the process by which an investor —whether a private equity fund, an integrated miner or a commodities trader— independently verifies that the promoter's assumptions withstand rigorous scrutiny. It is not just about confirming that the resource exists, but about quantifying the risks that can erode the expected return over a mine life that often exceeds 20 years.

In brine projects in the Puna, where initial capex can range between 400 million and 1 billion dollars depending on scale, an estimation error in any of the critical variables is amplified across substantial amounts. That is why the analysis is multidisciplinary, involving geologists, process engineers, environmental specialists, lawyers and financial analysts working in parallel on the project's data room.

Resources and Reserves: The Geological Foundation

The first front of review is the resource. The investor requires estimates certified under recognized standards —JORC or NI 43-101— and validated by an independent competent person. In brines, the analysis examines lithium concentration (usually between 300 and 900 mg/L in the Puna), salar chemistry, the magnesium/lithium ratio and impurities that raise processing costs, as well as aquifer porosity and permeability, which determine how much brine can be extracted sustainably.

The conversion of inferred resources to measured and indicated, and from there to probable and proven reserves, is a maturity gauge. A project with mostly inferred resources carries a high geological risk that capital discounts severely. Prolonged pumping tests and robust hydrogeological models are decisive evidence that the deposit can sustain projected production.

Cost Structure and Economic Viability

No audit proceeds without dissecting the economic model. The feasibility study —ideally a DFS or Definitive Feasibility Study— is reviewed with a focus on the operating cost per ton of lithium carbonate or hydroxide. Puna brines typically sit in the lower quartile of the global cost curve, with opex around 4,000 to 6,000 dollars per ton, a competitive advantage over hard-rock projects.

The investor recalculates NPV and IRR under conservative price scenarios and applies sensitivity analysis to variables such as lithium price, recovery rate, reagent and energy consumption, and the exchange rate. The volatility of carbonate prices in recent years —with pronounced peaks and drops— makes it essential to assess the project's resilience during bearish cycles, not just its performance at the peak.

Permits, Social License and Environmental Framework

Regulatory and social risk can halt a technically sound project. Due diligence verifies the status of permits: valid mining concessions, approved environmental impact reports, water rights and provincial endorsements. In Argentina, where mining is a provincial jurisdiction, the relationship with the governments of Jujuy, Salta and Catamarca is a determining factor.

Social license to operate receives growing attention. Agreements with Indigenous communities, consultation mechanisms and water management in an arid region where this resource is sensitive are all assessed. A latent social liability —unresolved conflicts or incomplete consultations— is a red flag that can delay or increase the cost of financing.

Offtake and Market Access

Market access materializes through offtake contracts, agreements by which a buyer —often a battery manufacturer or an Asian chemical company— commits to purchasing defined volumes. A firm offtake provides revenue predictability and is often a condition for financial close, since banks and funds value committed flows over spot market sales.

The investor analyzes the specified product quality, the pricing mechanism (fixed, indexed or hybrid), contract duration and the counterparty's creditworthiness. Logistics also carries weight: distance to Chilean ports or the Atlantic, road conditions and the availability of energy and gas, factors that in the Puna condition both costs and timelines.

Management and Execution Capacity

Finally, capital finances teams, not just assets. Management's track record is examined: prior experience in developing and commissioning lithium operations, a history of meeting schedules and budgets, and the ability to manage relationships with regulators and communities. A team that has already taken a project from exploration to production tangibly reduces execution risk.

Governance structure, transparency of information and alignment of incentives between founding shareholders and incoming investors complete the picture. An orderly data room and a management team that responds with verifiable data convey an operational discipline that capital knows how to read.

Argentina's Puna Under the Capital's Lens

Argentina, the world's fifth-largest lithium producer, concentrates its projects in the salars of the Puna, a geography of competitive costs but with specific logistical and social challenges. Since 2024, the Large Investment Incentive Regime (RIGI) added a relevant variable to due diligence: fiscal and exchange rate stability for 30 years and the tax benefits it offers to projects exceeding certain investment thresholds.

For the investor, this does not eliminate the need to verify resources, costs, permits and offtake, but it improves the risk-return equation of a country historically perceived as volatile. The Puna thus combines world-class brines with a renewed incentive framework. Those who do the technical homework rigorously will be better positioned to capture the value of an industry that will remain strategic in the global energy transition.