# Lithium Argentina Expands Cauchari-Olaroz Resource Estimate; Supports Stage 2 Development Plan Canonical Atlas analysis: https://atlas-staging.minestarters.com/news/lithium-argentina-expands-cauchari-olaroz-resource-estimate-supports-stage-2-dev--b6f5782c-19c6-468e-828d-efdac603f982 Original source: https://money.tmx.com/en/quote/LAR/news/7790009496849268/lithium-argentina-expands-cauchari-olaroz-resource-estimate-supports-stage-2-dev Publisher: tmx Original announcement: 2026-03-11T20:11:37.000Z Analysis by Minestarters Atlas Atlas analysis published: Unknown date Atlas analysis updated: Unknown date - Company: Lithium Argentina AG - Ticker: LAR - Exchange: TSX - Region: Jujuy Province, Argentina - Primary commodity: Lithium - Secondary commodities: None reported - Document categories: Resource update, Production - Extracted: 2026-08-25 18:48:56 UTC Narrative sentiment: 0.80 · Bullish ## Minestarters Atlas summary Lithium Argentina has released an updated mineral resource and reserve estimate for the Cauchari-Olaroz project, headlined by a 42% increase in M&I LCE tonnage to 28.1 Mt. The update incorporates new drilling and a basin-wide hydrological model, supporting the company's Stage 2 expansion targets. Reasoning: The update shows massive scale expansion in the Measured and Inferred categories, significantly de-risking the Stage 2 development plan despite a minor grade dilution. - Positive factor: Significant M&I tonnage growth \(42%\) - Positive factor: Massive Measured resource expansion - Positive factor: Inferred resource doubling - Positive factor: Supports Stage 2 expansion plans - Negative factor: Slight grade decline in M&I and Measured categories - Negative factor: Total P&P reserves decreased due to production depletion and capacity alignment Facts used in scoring: 5 ## Classification and evidence **Tonnage Growth** Polarity: positive Definition: Significant tonnage increase \(≥15%\) vs prior estimate with grade maintained or improved. Why it applies: M&I LCE tonnage increased by 42% compared to the 2019 estimate. Evidence · text > Increased Measured and Indicated \(“M&I”\) resource estimate by 42% to 28.1 Mt of LCE **QP/CP Signed** Polarity: positive Definition: Qualified Person \(QP\) or Competent Person \(CP\) named and signed off — a member of a recognized professional association \(e.g., AusIMM, SME, AIG, P.Geo\) with relevant experience. Why it applies: Mark King, PhD. PGeo, FGC is named as the independent Qualified Person. Evidence · text > The independent Qualified Person for the 2026 Mineral Resource Estimate is Mark King, PhD. PGeo, FGC. **Cut-off Disclosed** Polarity: positive Definition: Cut-off grade used for resource reporting is clearly stated, enabling like-for-like comparison. Why it applies: A lithium grade cutoff of 300 mg/L is explicitly stated. Evidence · text > A lithium grade cutoff of 300 mg/L is used to define the Mineral Resource Estimates ## Extracted facts Stored fact records: 5. Some facts used in scoring do not have a stored record. ## Resource Estimates (5) ### measured [Link to this fact](https://atlas-staging.minestarters.com/news/lithium-argentina-expands-cauchari-olaroz-resource-estimate-supports-stage-2-dev--b6f5782c-19c6-468e-828d-efdac603f982#fact-resource-facts-0) lithium #### Identity - Commodity: lithium - Ticker: LAR #### Resource Data - Category: measured - Tonnes: 16844844 - Grade: 557 - Grade Unit: mg/L - Contained Metal: 3164540 - Contained Unit: tonnes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-11T00:00:00.000Z Reasoning: Measured LCE tonnage grew from 3.6 Mt to 16.8 Mt. - Positive factor: Massive tonnage increase in Measured category - Negative factor: Slight grade decline vs 2019 Evidence · table > 557 Context: 5.89E+ 09 ### indicated [Link to this fact](https://atlas-staging.minestarters.com/news/lithium-argentina-expands-cauchari-olaroz-resource-estimate-supports-stage-2-dev--b6f5782c-19c6-468e-828d-efdac603f982#fact-resource-facts-1) lithium #### Identity - Commodity: lithium - Ticker: LAR #### Resource Data - Category: indicated - Tonnes: 11299172 - Grade: 571 - Grade Unit: mg/L - Contained Metal: 2122708 - Contained Unit: tonnes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-11T00:00:00.000Z Reasoning: Indicated LCE tonnage decreased from 16.3 Mt to 11.3 Mt. - Negative factor: Tonnage decline in Indicated category Evidence · table > 571 Context: 3.82E+ 09 ### inferred [Link to this fact](https://atlas-staging.minestarters.com/news/lithium-argentina-expands-cauchari-olaroz-resource-estimate-supports-stage-2-dev--b6f5782c-19c6-468e-828d-efdac603f982#fact-resource-facts-2) lithium #### Identity - Commodity: lithium - Ticker: LAR #### Resource Data - Category: inferred - Tonnes: 9614004 - Grade: 567 - Grade Unit: mg/L - Contained Metal: 1806125 - Contained Unit: tonnes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-11T00:00:00.000Z Reasoning: Inferred LCE tonnage increased from 4.7 Mt to 9.6 Mt. - Positive factor: Significant Inferred tonnage growth Evidence · table > 567 Context: 3.24E+ 09 ### proven [Link to this fact](https://atlas-staging.minestarters.com/news/lithium-argentina-expands-cauchari-olaroz-resource-estimate-supports-stage-2-dev--b6f5782c-19c6-468e-828d-efdac603f982#fact-resource-facts-3) lithium #### Identity - Commodity: lithium - Ticker: LAR #### Resource Data - Category: proven - Tonnes: 400000 - Grade: 588 - Grade Unit: mg/L - Contained Metal: 75315 - Contained Unit: tonnes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-11T00:00:00.000Z Reasoning: Proven reserves increased due to longer period assigned to production. - Positive factor: Proven reserves increased by ~45% vs 2019 Evidence · table > 588 Context: 227,782,565 ### probable [Link to this fact](https://atlas-staging.minestarters.com/news/lithium-argentina-expands-cauchari-olaroz-resource-estimate-supports-stage-2-dev--b6f5782c-19c6-468e-828d-efdac603f982#fact-resource-facts-4) lithium #### Identity - Commodity: lithium - Ticker: LAR #### Resource Data - Category: probable - Tonnes: 1000000 - Grade: 572 - Grade Unit: mg/L - Contained Metal: 190463 - Contained Unit: tonnes #### Review - Needs Review: No - Historical: No #### Dates - Event date: 2026-03-11T00:00:00.000Z Reasoning: Total reserves decreased as the model was updated to align with Stage 1 capacity. - Negative factor: Total P&P reserves decreased vs 2019 Evidence · table > 572 Context: 526,320,091 ## How Atlas produces this analysis Minestarters Atlas uses automated extraction to summarize mining announcements, identify reported measurements, and classify supporting evidence. Sentiment reflects the extracted narrative and classification rules; it is an interpretation, not a reported measurement. Evidence quotes and context are provided where available. Missing data, low-confidence results, and review flags indicate limitations. Check the original publisher announcement before relying on an interpretation.