11/06/2026 | Press release | Distributed by Public on 11/06/2026 12:04
Table of Contents
| CERTIFICATES | 1 |
| FORWARD LOOKING STATEMENTS | 13 |
| 1.0 EXECUTIVE SUMMARY | 14 |
| 1.1 INTRODUCTION | 14 |
| 1.2 PROPERTY DESCRIPTION, LOCATION, ACCESS AND HISTORY | 14 |
| 1.3 GEOLOGICAL SETTING AND DEPOSIT TYPES | 16 |
| 1.4 MINERALIZATION | 17 |
| 1.5 EXPLORATION AND DRILLING | 17 |
| 1.6 MINERAL PROCESSING AND METALLURGICAL TESTING | 18 |
| 1.6.1 Continuing Work Plan for Supporting the Plant Operations | 19 |
| 1.7 MINERAL RESOURCES AND MINERAL RESERVES | 19 |
| 1.7.1 Discussion of Mineral Resource and Mineral Reserve Cut-off Grade | 22 |
| 1.8 MINING METHODS | 24 |
| 1.8.1 Brine Processing | 24 |
| 1.8.2 Lithium Carbonate Plant Production | 24 |
| 1.9 SITE INFRASTRUCTURE AND BUILDINGS | 26 |
| 1.9.1 Wells | 26 |
| 1.9.1.1 Well Production Equipment Selection | 26 |
| 1.9.2 Evaporation Ponds | 26 |
| 1.9.3 Salt Harvest Equipment | 26 |
| 1.9.4 Site Infrastructure and Support Systems | 27 |
| 1.9.4.1 Natural Gas Pipeline | 27 |
| 1.9.4.2 Power Supply | 27 |
| 1.9.4.3 Permanent Camp | 27 |
| 1.9.4.4 Other Buildings | 28 |
| 1.9.4.5 Security | 28 |
| 1.9.4.6 Access and Site Roads | 28 |
| 1.9.4.7 Fuel Storage | 28 |
| 1.9.4.8 Water Supply | 28 |
| 1.9.4.9 Pond Solid Wastes | 29 |
| 1.9.4.10 Tailings Liquid Disposal | 29 |
| 1.10 MARKET STUDIES AND CONTRACTS | 29 |
| 1.11 PERMITTING, ENVIRONMENTAL STUDIES AND SOCIAL OR COMMUNITY IMPACT | 29 |
| 1.11.1 Permits and Authorities | 29 |
| 1.11.2 Social or Community Impact | 30 |
| 1.11.3 Environmental Baseline Studies | 30 |
| 1.12 CAPITAL AND OPERATING COST ESTIMATE | 31 |
| 1.12.1 Capital Cost Estimate | 31 |
| 1.12.2 Exclusions | 32 |
| 1.12.3 Currency | 32 |
| 1.12.4 Operating Cost Estimate | 32 |
| 1.12.5 Sustaining Capital Expenditures (Sustaining CAPEX) | 33 |
| 1.13 OTHER RELEVANT DATA AND INFORMATION | 34 |
| 1.13.1 Geological Setting and Deposit Types | 34 |
| 1.13.2 Mineralization | 35 |
| 1.13.3 Mineral Processing and Metallurgical Testing | 35 |
| 1.13.4 Mining Methods | 36 |
| Lithium Argentina AG., 2026 Cauchari-Olaroz S-K 1300 Technical Report | |
| Cauchari-Olaroz Salars, Argentina | Page i |
| 1.13.4.1 LCE Production Schedule | 36 |
| 1.13.5 Recovery Methods | 37 |
| 1.13.6 Site Infrastructure and Support Systems | 39 |
| 1.13.7 Market Studies and Contracts | 40 |
| 1.13.8 Permitting, Environmental Studies and Social or Community Impact | 41 |
| 1.13.8.1 Permits and Authorities | 41 |
| 1.13.8.2 Environmental Impact Assessment | 42 |
| 1.13.8.3 Environmental Management Plan | 42 |
| 1.13.8.4 Social Management for the Expansion | 43 |
| 1.13.8.5 Closure and Reclamation Plans | 43 |
| 1.13.9 Capital and Operating Cost Estimate | 43 |
| 1.13.9.1 Capital Cost Estimate | 43 |
| 1.13.9.2 Operating Cost Estimate | 45 |
| 1.13.10 Economic Analysis | 46 |
| 1.13.10.1 RIGI Economics | 46 |
| 1.13.11 Sensitivity Analysis | 48 |
| 1.14 CONCLUSIONS AND RECOMMENDATIONS | 48 |
| 1.14.1 Conclusions | 48 |
| 1.14.2 Recommendations | 49 |
| 2.0 INTRODUCTION | 51 |
| 2.1 TERMS OF REFERENCE | 51 |
| 2.2 QUALIFIED PERSONS SITE VISITS | 51 |
| 2.3 SOURCES OF INFORMATION | 51 |
| 2.4 UNITS AND CURRENCY | 52 |
| 3.0 PROPERTY DESCRIPTION | 58 |
| 3.1 PROPERTY DESCRIPTION | 58 |
| 3.2 PROPERTY AREA | 60 |
| 3.3 SQM JOINT VENTURE | 68 |
| 3.4 GANFENG JOINT VENTURE | 68 |
| 3.4.1 Los Boros Option Agreement | 68 |
| 3.4.2 Borax Argentina S.A. Agreement | 69 |
| 3.4.3 JEMSE Arrangement | 69 |
| 3.4.4 Corporate History of LAR | 70 |
| 3.5 TYPE OF MINERAL TENURE | 70 |
| 3.6 PROPERTY BOUNDARIES | 70 |
| 3.7 ENVIRONMENTAL LIABILITIES | 71 |
| 3.8 PERMITS | 71 |
| 3.9 NEIGHBOURING COMMUNITIES | 76 |
| 4.0 ACCESSIBILITY, CLIMATE, LOCAL RESOURCES, INFRASTRUCTURE, AND PHYSIOGRAPHY | 77 |
| 4.1 TOPOGRAPHY | 77 |
| 4.2 ACCESS | 77 |
| 4.3 POPULATION | 77 |
| 4.4 CLIMATE | 79 |
| 4.5 PRECIPITATION | 80 |
| 4.6 TEMPERATURE | 82 |
| 4.7 RELATIVE HUMIDITY | 85 |
| 4.8 ATMOSPHERIC PRESSURE | 86 |
| 4.9 WINDS | 87 |
| 4.10 SOLAR RADIATION | 94 |
| Lithium Argentina AG., 2026 Cauchari-Olaroz S-K 1300 Technical Report | |
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| 4.11 AIR QUALITY | 98 |
| 4.12 NOISE | 103 |
| 5.0 HISTORY | 107 |
| 6.0 GEOLOGICAL SETTING, MINERALIZATION AND DEPOSIT | 110 |
| 6.1 REGIONAL STRUCTURAL AND VOLCANIC FEATURES | 110 |
| 6.2 REGIONAL GEOLOGY | 112 |
| 6.3 GEOLOGY OF THE OLAROZ AND CAUCHARI SALARS | 113 |
| 6.3.1 Conceptual Geology | 113 |
| 6.4 SALAR SURFACE SEDIMENTS AND MINERALIZATION | 113 |
| 6.5 SALAR LITHOSTRATIGRAPHIC UNITS | 115 |
| 6.5.1 Sedimentation Cycles | 117 |
| 6.5.2 Sedimentary Facies Analysis and In-filling History | 117 |
| 6.6 SURFACE WATER | 125 |
| 6.7 MINERALIZATION | 127 |
| 6.8 DEPOSIT TYPES | 128 |
| 7.0 EXPLORATION | 132 |
| 7.1 OVERVIEW | 132 |
| 7.2 SURFACE BRINE PROGRAM | 132 |
| 7.3 SEISMIC GEOPHYSICAL PROGRAM | 133 |
| 7.4 GRAVITY SURVEY | 136 |
| 7.5 TEM SURVEY | 140 |
| 7.6 VERTICAL ELECTRICAL SOUNDING SURVEY (VES) | 148 |
| 7.7 2019 VERTICAL ELECTRICAL SOUNDING SURVEY (VES) | 155 |
| 7.8 2020 VERTICAL ELECTRICAL SOUNDING SURVEY (VES) | 159 |
| 7.9 2021 VERTICAL ELECTRICAL SOUNDING SURVEY (VES) | 162 |
| 7.10 2024 VERTICAL ELECTRICAL SOUNDING SURVEY (VES) | 164 |
| 7.11 BOUNDARY INVESTIGATION | 166 |
| 7.12 SURFACE WATER MONITORING PROGRAM | 169 |
| 7.13 BRINE LEVEL MONITORING PROGRAM | 180 |
| 7.14 PUMPING TEST PROGRAM | 186 |
| 7.14.1 Overview | 186 |
| 7.15 CHEMISTRY OF SAMPLES COLLECTED DURING PUMP TESTS | 188 |
| 7.16 DRILLING | 190 |
| 7.16.1 Reverse Circulation (RC) Borehole Program 2009-2010 | 190 |
| 7.16.2 Diamond Drilling (DDH) Borehole Program 2009-2010 | 195 |
| 7.16.3 Diamond Drilling (DDH) Borehole Program 2017-2019 | 196 |
| 7.16.4 Production Well Drilling | 205 |
| 7.16.5 Exploration Diamond Drilling (DDH) Borehole and Production Well Drilling Program 2022-2024 | 213 |
| 7.16.6 Conclusion | 213 |
| 8.0 SAMPLE PREPARATION, ANALYSES AND SECURITY | 220 |
| 8.1 SAMPLING METHOD AND APPROACH | 220 |
| 8.2 ROTARY DRILLING SAMPLING METHODS | 220 |
| 8.3 DIAMOND DRILLING BOREHOLE SOLIDS SAMPLING METHODS | 221 |
| 8.4 DIAMOND DRILLING BOREHOLE BRINE SAMPLING METHODS | 223 |
| 8.5 SAMPLING PREPARATION, ANALYSIS AND SECURITY | 223 |
| 8.5.1 Brine Samples from the Piezometers | 223 |
| 8.5.2 Brine Samples from the Pumping Test Program | 223 |
| 8.6 BRINE ANALYSIS | 225 |
| 8.6.1 Analytical Methods | 225 |
| 8.6.2 Sample Security | 226 |
| Lithium Argentina AG., 2026 Cauchari-Olaroz S-K 1300 Technical Report | |
| Cauchari-Olaroz Salars, Argentina | Page iii |
| 8.7 SAMPLE PREPARATION ANALYSIS AND SECURITY CONCLUSIONS AND RECOMMENDATIONS | 226 |
| 8.8 GEOTECHNICAL ANALYSIS | 226 |
| 8.8.1 Overview | 226 |
| 8.9 ANALYTICAL METHODS | 227 |
| 8.9.1 Specific Gravity | 227 |
| 8.9.2 Relative Brine Release Capacity (RBRC) | 227 |
| 8.9.3 Particle Size Analysis | 228 |
| 8.9.4 Exar Porosity Test Lab | 228 |
| 9.0 DATA VERIFICATION | 229 |
| 9.1 OVERVIEW | 229 |
| 9.2 SITE VISITS | 229 |
| 9.3 FEBRUARY 2019 SITE VISIT AND DUE DILIGENCE SAMPLING | 230 |
| 9.4 JUNE 2019 SITE VISIT AND DUE DILIGENCE SAMPLING | 232 |
| 9.5 QUALITY ASSURANCE/QUALITY CONTROL PROGRAM | 233 |
| 9.6 PERFORMANCE OF BLANK SAMPLES | 234 |
| 9.7 CERTIFIED REFERENCE MATERIALS | 235 |
| 9.8 DUPLICATES | 240 |
| 9.9 CHECK ASSAYS EXAR VERSUS ALEX STEWART | 240 |
| 9.10 2024 QA/QC PROCEDURES | 242 |
| 9.11 CONCLUSIONS AND RECOMMENDATIONS | 243 |
| 10.0 MINERAL PROCESSING AND METALLURGICAL TESTING | 245 |
| 10.1 POND TESTS - UNIVERSIDAD DE ANTOFAGASTA, CHILE | 246 |
| 10.2 TESTS - EXAR, CAUCHARI SALAR | 248 |
| 10.2.1 Salar de Cauchari Evaporation Pan and Pilot Pond Testing | 248 |
| 10.2.1.1 Pond Pilot Testing | 248 |
| 10.2.2 2017 Evaporation Tests | 249 |
| 10.2.3 Liming Tests - Exar, Cauchari Salar | 251 |
| 10.3 SOLVENT EXTRACTION TESTS - SGS MINERALS AND IIT, UNIVERSIDAD DE CONCEPCIÓN | 252 |
| 10.4 CARBONATION TESTS - SGS MINERALS (CANADA) | 254 |
| 10.5 PILOT PURIFICATION TESTING - SGS MINERALS | 254 |
| 10.5.1 Lithium Carbonate Precipitation | 257 |
| 10.6 RECENT TESTING WORK PERFORMED IN THE PILOT PLANT | 258 |
| 10.6.1 Monitoring the Consumption of Lime Reagent in the Liming Plant | 258 |
| 10.6.2 Lithium Losses in the Secondary Purification Filter Cake | 261 |
| 10.6.3 SO₄²⁻ Adsorption During Li₂CO₃ Precipitation | 262 |
| 10.6.4 Effect of Salinity on Organic Adsorption | 262 |
| 10.7 RECENT WORK PERFORMED IN EXTERNAL LABORATORIES | 263 |
| 10.8 CONTINUING WORK PLAN FOR SUPPORTING THE PLANT OPERATIONS | 263 |
| 11.0 MINERAL RESOURCE ESTIMATES | 265 |
| 11.1 OVERVIEW | 265 |
| 11.1.1 Statement for Brine Mineral Prospects and Related Terms | 268 |
| 11.2 MINERAL RESOURCE ESTIMATE METHODOLOGY | 270 |
| 11.2.1 Most Recent Previous Mineral Resource Estimate (Burga et al., 2025) | 270 |
| 11.2.2 Background of the Current Hydrostratigraphic Model | 271 |
| 11.2.3 Hydrostratigraphic Units | 273 |
| 11.2.4 Specific Yield | 275 |
| 11.2.5 Lithium Grade | 277 |
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| 11.2.6 Mineral Resource Block Model Variography, Methods, and Validation | 280 |
| 11.2.7 Resource Classification | 285 |
| 11.3 2026 MINERAL RESOURCE STATEMENT | 288 |
| 11.4 REASONS FOR DIFFERENCES FROM PREVIOUS ESTIMATE (BURGA, 2025) | 289 |
| 11.5 CONFIDENCE IN THE MINERAL RESOURCE ESTIMATE | 292 |
| 12.0 MINERAL RESERVE ESTIMATE | 293 |
| 12.1 BACKGROUND | 293 |
| 12.2 OVERVIEW | 293 |
| 12.3 CONCEPTUAL MODEL | 295 |
| 12.4 NUMERICAL MODEL CONSTRUCTION | 296 |
| 12.5 NUMERICAL MODEL MESH | 297 |
| 12.6 NUMERICAL MODEL BOUNDARY CONDITIONS | 299 |
| 12.6.1 Overview | 299 |
| 12.6.2 Zero flow | 300 |
| 12.6.3 Recharge | 300 |
| 12.6.4 Evaporation | 303 |
| 12.6.5 Archibarca Zone | 305 |
| 12.7 HYDRAULIC PROPERTIES | 307 |
| 12.8 PRE-DEVELOPMENT MODEL CONDITIONS | 310 |
| 12.9 TRANSIENT MODEL CALIBRATION | 314 |
| 12.10 2026 MINERAL RESERVE ESTIMATE MODEL RESULTS | 319 |
| 12.11 STATEMENT FOR LITHIUM MINERAL RESERVE ESTIMATE | 324 |
| 12.12 REASONS FOR DIFFERENCES FROM PREVIOUS ESTIMATE (BURGA, 2025) | 326 |
| 12.13 RELATIVE ACCURACY IN MINERAL RESERVE ESTIMATE | 327 |
| 13.0 MINING METHODS | 329 |
| 13.1 PRODUCTION WELLFIELD | 329 |
| 13.2 BRINE PRODUCTION UNCERTAINTIES, LIMITATIONS, AND RISK ASSESSMENT | 329 |
| 13.3 WELL UTILIZATION | 331 |
| 13.3.1 Well Utilization 2018 to 2025 | 331 |
| 14.0 PROCESSING AND RECOVERY METHODS (BRINE) | 337 |
| 14.1 GENERAL | 337 |
| 14.2 PROCESS DESCRIPTION | 337 |
| 14.2.1 Process Block Diagram | 337 |
| 14.3 BRINE CONCENTRATION PROCESS DESCRIPTION | 338 |
| 14.3.1 Pond Surface Area | 338 |
| 14.3.2 Pond Design | 339 |
| 14.3.3 Pond Layout | 342 |
| 14.3.4 Pond Transfer System | 342 |
| 14.3.5 Salt Harvesting | 343 |
| 14.3.6 Impurity Reduction-Liming | 343 |
| 14.4 LITHIUM PLANT PROCESS DESCRIPTION | 344 |
| 14.4.1 Solvent Extraction for Boron Removal | 346 |
| 14.4.2 Purification Process | 348 |
| 14.4.2.1 Primary Purification - Magnesium and Sulphate Reduction | 348 |
| 14.4.2.2 Secondary Purification - Calcium and Sulphates Removal | 349 |
| 14.4.2.3 Primary IX | 350 |
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| 14.4.2.4 Carbonate Removal | 351 |
| 14.4.3 Evaporation and KCl Crystallization Stage | 352 |
| 14.4.3.1 Secondary IX Polishing | 353 |
| 14.4.4 Lithium Carbonate Crystallization and Recovery | 354 |
| 14.4.4.1 Mother Liquor Handling | 356 |
| 14.4.5 Lithium Carbonate Drying, Micronization and Packaging | 356 |
| 14.5 REAGENTS | 358 |
| 14.6 PLANT DESIGN BASIS | 359 |
| 14.7 PROCESS CONFIGURATION UPDATE | 360 |
| 15.0 INFRASTRUCTURE | 361 |
| 15.1 MAIN FACILITIES LOCATION | 361 |
| 15.2 BRINE EXTRACTION | 361 |
| 15.2.1 Brine Extraction Wells | 361 |
| 15.2.2 Well Pumps | 361 |
| 15.2.3 Additional Equipment in the Wellfield | 362 |
| 15.2.4 Wellfield Electric Power Distribution | 362 |
| 15.3 EVAPORATION PONDS | 362 |
| 15.4 SALT HARVEST EQUIPMENT | 364 |
| 15.5 LIMING STAGE | 364 |
| 15.5.1 Quick Lime Reception | 364 |
| 15.5.2 Liming System | 365 |
| 15.6 LITHIUM CARBONATE PLANT | 365 |
| 15.6.1 Process Facilities | 365 |
| 15.6.1.1 Boron Removal - Solvent Extraction | 366 |
| 15.6.1.2 Brine Purification | 367 |
| 15.6.1.3 Primary Treatment | 367 |
| 15.6.1.4 Secondary Treatment | 367 |
| 15.6.1.5 Primary IX | 367 |
| 15.6.1.6 Brine Concentration and Na/K Reduction | 368 |
| 15.6.1.7 Feed Preheat | 368 |
| 15.6.1.8 Multiple-Effect Evaporation and Crystallization | 368 |
| 15.6.1.9 Flash-Cooled Crystallization | 368 |
| 15.6.1.10 Process Condensate Collection | 368 |
| 15.6.1.11 Mg/Ca Polishing IX | 368 |
| 15.6.2 Lithium Carbonate Production | 368 |
| 15.6.2.1 Carbonation | 368 |
| 15.6.2.2 Final Product | 369 |
| 15.6.3 Plant Wide Instrumentation | 369 |
| 15.7 SUPPORTING SERVICES | 369 |
| 15.7.1 Fresh Water | 369 |
| 15.7.2 Sanitary Services | 370 |
| 15.7.3 Diesel Fuel | 370 |
| 15.8 PERMANENT CAMP | 370 |
| 15.8.1 Other Buildings | 372 |
| 15.8.2 Security | 372 |
| 15.9 OFF-SITE INFRASTRUCTURE AND SUPPORT SYSTEMS | 372 |
| 15.9.1 Natural Gas Pipeline | 372 |
| 15.9.2 Electrical Power Supply | 373 |
| 15.9.3 Water Pipeline | 373 |
| 15.9.4 Control Systems and Instrumentation | 373 |
| 15.9.4.1 Control and Data Building | 373 |
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| 15.9.4.2 Telecommunications System | 374 |
| 15.9.4.3 Control System | 374 |
| 15.9.4.4 Other Systems | 375 |
| 16.0 MARKET STUDIES | 376 |
| 16.1 LITHIUM DEMAND | 376 |
| 16.2 LITHIUM SUPPLY | 378 |
| 16.3 PRICE FORECAST | 381 |
| 16.4 OFFTAKE CONTRACTS | 382 |
| 17.0 ENVIRONMENTAL STUDIES, PERMITTING AND PLANS, NEGOTIATIONS OR AGREEMENTS WITH LOCAL INDIVIDUALS OR GROUPS | 383 |
| 17.1 EXECUTIVE SUMMARY | 383 |
| 17.2 INTRODUCTION | 383 |
| 17.3 ENVIRONMENTAL STUDIES | 384 |
| 17.3.1 Executive Summary | 384 |
| 17.3.2 Objective | 384 |
| 17.3.3 Baseline Studies | 385 |
| 17.3.3.1 Sources of Baseline Data | 385 |
| 17.3.3.2 Methods Used for Data Collection | 385 |
| 17.3.4 Environmental Impacts | 387 |
| 17.3.4.1 Potential Sources of Impacts | 387 |
| 17.3.4.2 Impact Evaluation Framework | 387 |
| 17.3.4.3 Overview of Observed Impacts | 388 |
| 17.3.4.4 Air Quality Impacts | 388 |
| 17.3.4.5 Noise Impacts | 388 |
| 17.3.4.6 Surface Water Quality Impacts | 388 |
| 17.3.4.7 Groundwater Quality Impacts | 388 |
| 17.3.4.8 Soil Quality Impacts | 388 |
| 17.3.4.9 Biological Environment - Impact Overview | 388 |
| 17.3.4.10 Conclusions | 388 |
| 17.3.5 Monitoring Programs | 388 |
| 17.3.6 Environmental Management Plan | 389 |
| 17.3.6.1 Purpose of the EMP | 389 |
| 17.3.6.2 Key Components of the EMP | 389 |
| 17.3.6.3 Compliance with Regulations and Standards | 390 |
| 17.3.6.4 Monitoring and Reporting | 391 |
| 17.3.6.5 Adaptive Management and Continuous Improvement | 391 |
| 17.3.6.6 Conclusions | 391 |
| 17.3.6.7 Recommendations | 392 |
| 17.4 PERMITTING | 392 |
| 17.4.1 Executive Summary | 392 |
| 17.4.2 Legal Framework | 393 |
| 17.4.2.1 Permits for Exploration | 393 |
| 17.4.2.2 Permits for Exploitation | 393 |
| 17.4.2.3 Recent Legislation Updates | 393 |
| 17.4.3 Framework Legal Study | 394 |
| 17.4.4 Exploration Phase Permits for Project | 395 |
| 17.4.5 Exploitation Phase Permits for Project | 396 |
| 17.4.6 Water Permits | 398 |
| 17.4.7 Provincial Regulations | 398 |
| 17.4.8 Compliance Documentation | 399 |
| 17.4.9 Permit Risks | 399 |
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| Cauchari-Olaroz Salars, Argentina | Page vii |
| 17.5 SOCIAL OR COMMUNITY IMPACT | 400 |
| 17.5.1 Executive Summary | 400 |
| 17.5.2 Social Baseline Context and Re-characterization - Operations Phase | 400 |
| 17.5.3 Evaluation of Social Impacts - Operations Phase | 400 |
| 17.5.3.1 Employment and Workforce Integration | 401 |
| 17.5.3.2 Local Procurement and Economic Inclusion | 401 |
| 17.5.3.3 Community Relations and Participation | 401 |
| 17.5.3.4 Grievances and Social Risk Management | 402 |
| 17.5.3.5 Cultural and Social Cohesion | 402 |
| 17.5.4 Social Impact Management and Transition to Operations | 402 |
| 17.5.5 Integration of Community Co-Creation Principles and Social Closure | 403 |
| 17.5.6 Conclusions | 403 |
| 17.6 CLOSURE AND RECLAMATION PLANS | 403 |
| 17.6.1 Key Closure Requirements and Commitments (Pre-2023) | 404 |
| 17.6.1.1 Closure Objectives | 404 |
| 17.6.1.2 Financial Assurance | 404 |
| 17.6.1.3 Post-Closure Monitoring | 405 |
| 17.6.2 New Requirements (Decree No. 7751-DEyP-2023) | 405 |
| 17.6.2.1 Closure Objectives | 405 |
| 17.6.2.2 Financial Assurance | 405 |
| 17.6.2.3 Post-Closure Monitoring | 406 |
| 18.0 CAPITAL AND OPERATING COSTS | 407 |
| 18.1 CAPITAL COSTS (CAPEX) ESTIMATE | 407 |
| 18.1.1 Capital Expenditures CAPEX Definition | 407 |
| 18.1.2 Evaporation Ponds | 408 |
| 18.1.3 Lithium Carbonate Plant | 409 |
| 18.1.4 Reagents Costs | 409 |
| 18.1.5 Offsite Infrastructure Costs | 409 |
| 18.1.5.1 Natural Gas Supply to Plant | 410 |
| 18.1.5.2 Power Supply to Plant | 410 |
| 18.1.5.3 Onsite Infrastructure and General Cost Summary | 410 |
| 18.2 INDIRECT COSTS | 410 |
| 18.2.1 Final CAPEX for Exar 40,000 tpa Plant | 411 |
| 18.2.2 Exclusions | 411 |
| 18.2.3 Currency | 411 |
| 18.2.4 Sustaining Capital | 411 |
| 18.3 OPERATING COSTS ESTIMATE | 412 |
| 18.3.1 Operating Cost Summary | 412 |
| 18.3.2 Pond and Plant Reagents Costs Definition | 413 |
| 18.3.3 Pond Salt Harvesting | 414 |
| 18.3.4 Solid Waste Management (Rises) | 414 |
| 18.3.5 Energy Cost | 414 |
| 18.3.6 Maintenance Cost | 414 |
| 18.3.7 Labour Cost | 414 |
| 18.3.8 Catering, Camp Services Cost, Security and Third-Party Services | 414 |
| 18.3.9 General and Administrative Costs | 414 |
| 18.4 COMPANY OPERATIONAL ORGANIZATION | 415 |
| 19.0 ECONOMIC ANALYSIS | 417 |
| 20.0 ADJACENT PROPERTIES | 418 |
| Lithium Argentina AG., 2026 Cauchari-Olaroz S-K 1300 Technical Report | |
| Cauchari-Olaroz Salars, Argentina | Page viii |
| 20.1 OLAROZ PROJECT - ARCADIUM LITHIUM | 418 |
| 20.2 CAUCHARI PROJECT - RIO TINTO | 422 |
| 21.0 OTHER RELEVANT DATA AND INFORMATION | 424 |
| 21.1 GEOLOGICAL SETTING AND MINERALIZATION | 425 |
| 21.1.1 Regional Structural and Volcanic Features | 425 |
| 21.1.2 Regional Geology | 428 |
| 21.1.3 Geology of the Olaroz and Cauchari Salars | 429 |
| 21.1.3.1 Conceptual Geology | 429 |
| 21.1.4 Salar Surface Sediments and Mineralization | 429 |
| 21.1.5 Salar Lithostratigraphic Units | 431 |
| 21.1.5.1 Sedimentation Cycles | 432 |
| 21.1.5.2 Sedimentary Facies Analysis and In-filling History | 433 |
| 21.1.6 Surface Water | 437 |
| 21.1.7 Mineralization | 440 |
| 21.2 DEPOSIT TYPES | 440 |
| 21.3 MINERAL PROCESSING AND METALLURGICAL TESTING | 441 |
| 21.3.1 Introduction | 441 |
| 21.3.2 Process Overview | 441 |
| 21.3.2.1 Brine Evaporation | 441 |
| 21.3.2.2 Purification of Brine | 441 |
| 21.3.3 Solvent Extraction Test Work | 441 |
| 21.3.3.1 Experimental Principle | 442 |
| 21.3.3.2 Experimental Steps | 442 |
| 21.3.3.3 Experimental Summary and Data | 442 |
| 21.3.4 Operation Experiment of Mixed Clarification Tank | 443 |
| 21.3.4.1 Experimental Results and Discussion | 444 |
| 21.3.4.2 Conclusion | 451 |
| 21.3.5 Lithium Carbonate | 451 |
| 21.3.6 Closing Statement | 452 |
| 21.4 MINING METHODS (BRINE WELLFIELD) | 452 |
| 21.4.1 LCE Production Schedule | 452 |
| 21.4.2 Production Well Field | 453 |
| 21.4.2.1 Drilling Method | 454 |
| 21.4.2.2 Well Design | 455 |
| 21.4.3 Uncertainty Assessment | 457 |
| 21.4.4 Well Utilization Philosophy | 457 |
| 21.5 RECOVERY METHODS | 459 |
| 21.5.1 General | 459 |
| 21.5.2 Process Description | 459 |
| 21.5.3 Pre-concentration Ponds | 461 |
| 21.5.3.1 Salt Harvesting | 466 |
| 21.5.3.2 Waste Salts Quantities and Areas | 466 |
| 21.5.3.3 Analyses of Brine | 467 |
| 21.5.4 Brine Processing Description | 467 |
| 21.5.4.1 General | 467 |
| 21.5.4.2 Solvent Extraction Criteria | 467 |
| 21.5.5 Primary Purification | 470 |
| 21.5.5.1 Boron Removal | 470 |
| 21.5.5.2 Calcium Removal | 471 |
| 21.5.6 Secondary Purification | 473 |
| 21.5.6.1 Process Description | 473 |
| Lithium Argentina AG., 2026 Cauchari-Olaroz S-K 1300 Technical Report | |
| Cauchari-Olaroz Salars, Argentina | Page ix |
| 21.5.7 Lithium Carbonate Plant | 475 |
| 21.6 PROJECT INFRASTRUCTURE | 476 |
| 21.6.1 General | 476 |
| 21.6.2 Utilities | 479 |
| 21.6.2.1 Power Supply | 479 |
| 21.6.2.2 Natural Gas Supply | 481 |
| 21.6.2.3 Aqueduct and Industrial Water System | 482 |
| 21.6.2.4 Water Supply | 484 |
| 21.6.2.5 Steam | 487 |
| 21.6.2.6 Fuel Storage System | 488 |
| 21.6.2.7 Sewage Treatment System | 488 |
| 21.6.2.8 Reagents | 488 |
| 21.6.3 Ancillary Facilities | 489 |
| 21.6.3.1 Truck shops | 489 |
| 21.6.3.2 Warehouses | 489 |
| 21.6.3.3 Offices | 489 |
| 21.6.3.4 Camp | 490 |
| 21.7 MARKET STUDIES AND CONTRACTS | 490 |
| 21.7.1 Lithium Demand | 491 |
| 21.7.2 Lithium Supply | 493 |
| 21.7.3 Price Forecast | 495 |
| 21.7.4 Offtake Contracts | 496 |
| 21.8 ENVIRONMENTAL STUDIES, PERMITTING AND SOCIAL COMMUNITY IMPACT | 497 |
| 21.8.1 Environmental Studies and Permitting | 497 |
| 21.8.1.1 Introduction | 497 |
| 21.8.1.2 Legal Framework | 497 |
| 21.8.1.3 Exploration Phase Permits for the Expansion | 498 |
| 21.8.1.4 Exploitation Phase Permits for the Expansion | 498 |
| 21.8.1.5 Water Permits | 499 |
| 21.8.2 Environmental Impact Assessment | 499 |
| 21.8.2.1 Introduction | 499 |
| 21.8.2.2 Sources of Potential Impacts | 500 |
| 21.8.2.3 Impact Evaluation Framework | 500 |
| 21.8.2.4 Overview of Environmental Impacts | 500 |
| 21.8.2.5 Environmental Management Plan ("EMP") | 502 |
| 21.8.2.6 Monitoring and Reporting | 502 |
| 21.8.3 Social or Community Relations | 503 |
| 21.8.3.1 Introduction | 503 |
| 21.8.3.2 Social Baseline Context and Re-characterization - Operations Phase | 504 |
| 21.8.3.3 Evaluation of Social Outreach - the Expansion | 504 |
| 21.8.3.4 Social Management for the Expansion | 505 |
| 21.8.3.5 Community Co-Creation and Long-Term Social Sustainability | 506 |
| 21.8.4 Closure and Reclamation Plans | 506 |
| 21.8.4.1 Introduction | 506 |
| 21.8.4.2 Closure Objectives | 507 |
| 21.8.5 Effluent Generation | 508 |
| 21.8.5.1 Cleaning Effluents and Sewage Liquids | 508 |
| 21.8.5.2 Laboratory Effluents | 508 |
| Lithium Argentina AG., 2026 Cauchari-Olaroz S-K 1300 Technical Report | |
| Cauchari-Olaroz Salars, Argentina | Page x |
| 21.8.5.3 Effluents from Resin Regeneration for Organics Removal | 508 |
| 21.8.5.4 Effluents from Truck Shop Washing Vehicles and Equipment | 509 |
| 21.8.5.5 E-Liquid Industrial Waste/Residual Brines | 509 |
| 21.8.6 Waste Management | 510 |
| 21.8.6.1 Generation of Solid and Semi-solid Waste | 510 |
| 21.9 CAPITAL AND OPERATING COSTS | 510 |
| 21.9.1 Capital Cost Estimate | 511 |
| 21.9.1.1 Basis of Estimate | 512 |
| 21.9.1.2 Exclusions and Assumptions | 512 |
| 21.9.1.3 Sustaining Capital Costs | 513 |
| 21.9.1.4 Brine Well Field | 513 |
| 21.9.1.5 Evaporation Ponds | 513 |
| 21.9.1.6 Process Plants | 514 |
| 21.9.1.7 Infrastructure and Energy | 516 |
| 21.9.1.8 Salts Stockpile Area | 516 |
| 21.9.1.9 Sustaining Capital | 517 |
| 21.9.1.10 Owner's and Indirect Costs | 518 |
| 21.9.1.11 Engineering, Procurement and Construction Services | 518 |
| 21.9.1.12 Contingency | 518 |
| 21.9.1.13 CAPEX Summary | 518 |
| 21.9.2 Operating Costs Estimate | 520 |
| 21.9.2.1 Basis of Estimate | 520 |
| 21.9.2.2 Manpower | 521 |
| 21.9.2.3 General and Admin Costs | 521 |
| 21.9.2.4 Electric Power | 522 |
| 21.9.2.5 Reagents, Fuel and Consumables | 522 |
| 21.9.2.6 Ponds Harvesting and Salts Stockpile Area | 523 |
| 21.9.2.7 Water | 523 |
| 21.9.2.8 Camp | 523 |
| 21.9.2.9 Product Transportation | 524 |
| 21.9.2.10 Other Costs (General and Maintenance Supplies) | 524 |
| 21.9.2.11 OPEX Summary | 524 |
| 21.10 ECONOMIC ANALYSIS | 525 |
| 21.10.1 Main Assumptions | 526 |
| 21.10.2 Evaluation Criteria | 526 |
| 21.10.3 Tax | 527 |
| 21.10.3.1 Provincial Royalty | 527 |
| 21.10.3.2 Export Refund | 527 |
| 21.10.3.3 Tax on Debits and Credits Accounts | 527 |
| 21.10.3.4 Aboriginal Programs | 528 |
| 21.10.3.5 Capital Allowance | 528 |
| 21.10.3.6 Corporate Taxes and VAT | 528 |
| 21.10.4 Capital Expenditures | 528 |
| 21.10.5 Operating Costs | 529 |
| 21.10.6 Production Revenues | 529 |
| 21.10.7 Cash Flow Projection | 529 |
| 21.10.8 Economic Evaluation Results | 531 |
| 21.10.9 Payback Analysis | 531 |
| 21.10.10 Sensitivity Analysis | 531 |
| 21.10.11 Discussion and Conclusions | 534 |
| Lithium Argentina AG., 2026 Cauchari-Olaroz S-K 1300 Technical Report | |
| Cauchari-Olaroz Salars, Argentina | Page xi |
| 21.11 OTHER RELEVANT INFORMATION | 534 |
| 21.11.1 Project Schedule | 534 |
| 21.12 CONCLUSION AND RECOMMENDATIONS | 537 |
| 21.12.1 Mining (Well field) | 537 |
| 21.12.2 Process Information and Design | 537 |
| 21.12.3 Economic Analysis | 537 |
| 22.0 INTERPRETATION AND CONCLUSIONS | 540 |
| 22.1 GEOLOGY AND RESOURCES | 540 |
| 22.2 BRINE PRODUCTION | 542 |
| 22.3 PROCESS INFORMATION AND DESIGN | 542 |
| 22.4 ENVIRONMENTAL STUDIES, PERMITTING AND SOCIAL OR COMMUNITY IMPACT | 543 |
| 22.5 ECONOMIC ANALYSIS | 543 |
| 22.6 OTHER RELEVANT DATA AND INFORMATION | 543 |
| 22.6.1 Mining (Well Field) | 543 |
| 22.6.2 Process Information and Design | 544 |
| 22.6.3 Economic Analysis | 544 |
| 22.7 PROJECT RISKS | 544 |
| 23.0 RECOMMENDATIONS | 546 |
| 23.1 RECOMMENDATIONS | 546 |
| 24.0 REFERENCES | 547 |
| 25.0 RELIANCE ON INFORMATION PROVIDED BY THE REGISTRANT | 555 |
| APPENDIX 1. SUMMARY TABLES OF PUMPING TEST RESULTS FOR EXPLORATION AND PRODUCTION WELLS | 556 |
| Lithium Argentina AG., 2026 Cauchari-Olaroz S-K 1300 Technical Report | |
| Cauchari-Olaroz Salars, Argentina | Page xii |
List of Tables
| Table 1.1 Summary of 2026 Lithium Mineral Resource Estimate - Exclusive of Mineral Reserves (1-12) | 20 |
| Table 1.2 Summary of 2026 Mineral Reserve Estimate (1-12) | 21 |
| Table 1.3 Lithium Carbonate Plant Design Criteria | 26 |
| Table 1.4 Capital Costs Summary | 32 |
| Table 1.5 Operating Costs Summary | 33 |
| Table 1.6 Sustaining CAPEX Expenditure Schedule | 34 |
| Table 1.7 LCE Production Schedule for Both Stages | 37 |
| Table 1.8 Operating Criteria | 38 |
| Table 1.9 Five-Year Average Spot Price of Battery Grade LCE | 41 |
| Table 1.10 Capital Costs Summar | 45 |
| Table 1.11 Operating Costs Summary | 46 |
| Table 1.12 The Key Inputs to Economic Analysis | 47 |
| Table 1.13 Recommendations Budget | 50 |
| Table 2.1 Abbreviations Table | 52 |
| Table 3.1 Exar Mineral Claims | 62 |
| Table 3.2 Annual Royalties and Payments | 70 |
| Table 3.3 Exploration Permits for Cauchari-Olaroz Exploration Work | 72 |
| Table 3.4 Exploitation Permits for Cauchari-Olaroz | 74 |
| Table 4.1 Location Coordinates of the Meteorological Stations of Cauchari-Olaroz | 79 |
| Table 4.2 Distribution of Wind Frequencies by Direction and Speed from 2023 to 2025 - Davis Weather Station | 87 |
| Table 4.3 Average Monthly and Average Annual Wind Speed (km/h) from 2023 to 2025 - Davis Weather Station | 90 |
| Table 4.4 Distribution of Wind Frequencies by Direction and Speed from 2024 to 2025 - Campbell North Weather Station | 91 |
| Table 4.5 Average Monthly and Average Annual Wind Speed (km/h) Period 2024 to 2025, EM Campbell Norte | 93 |
| Table 4.6 Air Quality Guideline Levels | 98 |
| Table 4.7 Air Quality Sampling Points | 99 |
| Table 4.8 Historical Air Quality Results | 101 |
| Table 4.9 Comparison Standards for Noise Quality | 103 |
| Table 4.10 Location of Noise Quality Sampling Points | 105 |
| Table 4.11 Historical Noise Quality Results and the Thresholds Established by International Standards | 105 |
| Table 5.1 Summary of 2012 Lithium Mineral Resource for Lithium (1-4) | 107 |
| Table 5.2 Summary of 2019 Mineral Resource Estimate for Lithium (1-5) | 108 |
| Table 5.3 Summary of 2019 Estimated Proven and Probable Mineral Reserves (Without Processing Efficiency) (1-9) | 108 |
| Table 6.1 Comparative Chemical Composition of Andean Salt Pans | 130 |
| Table 7.1 Test Pit Transect Results for TDS and Lithium | 168 |
| Table 7.2 Test Pit Transect Results for TDS and Lithium with Depths | 169 |
| Table 7.3 Average Surface Water Flow Rates | 172 |
| Table 7.4 Static Water Level Measurements for the Period from January 2010 to February 2019 | 180 |
| Table 7.5 Borehole Drilling Summary for the RC Borehole Program Conducted in 2009 and 2010 | 191 |
| Table 7.6 Summary of Brine Samples Collected and Submitted for Laboratory Analysis from the RC and DDH Borehole Programs | 192 |
| Lithium Argentina AG., 2026 Cauchari-Olaroz S-K 1300 Technical Report | |
| Cauchari-Olaroz Salars, Argentina | Page xiii |
| Table 7.7 Brine Concentrations (mg/L) and Ratios Averaged Across Selected Depth Intervals for RC Program Boreholes | 193 |
| Table 7.8 Borehole Drilling Summary for the DDH Program Conducted in 2009 and 2010 | 195 |
| Table 7.9 Brine Concentrations (mg/L) Averaged Across Selected Depth Intervals for DDH Program Boreholes | 196 |
| Table 7.10 Borehole Drilling Summary for the DDH Program Conducted in 2017 and 2019 | 198 |
| Table 7.11 Brine Concentrations (mg/L) Averaged Across Selected Depth Intervals for DDH Program Boreholes 2017-2019 | 202 |
| Table 7.12 Production Well Drilling and Construction Details | 206 |
| Table 7.13 Borehole Drilling Summary for the DDH and Production Well Drilling Program Conducted in 2022 and 2024 | 214 |
| Table 8.1 Summary Pumping Test Measurement Frequency | 224 |
| Table 8.2 Summary of Geotechnical Property Analyses | 227 |
| Table 9.1 Results of Due Diligence Sampling - February 2019 | 230 |
| Table 9.2 Results of Due Diligence Sampling - June 2019 | 232 |
| Table 9.3 QA/QC Sampling | 233 |
| Table 9.4 Results of Due Diligence Sampling | 235 |
| Table 9.5 Check Assay Sampling | 242 |
| Table 10.1 Monthly Evaporation Ratio | 251 |
| Table 10.2 Composition of the Brine Used for Testing SX | 253 |
| Table 10.3 Reagent Optimization in Primary Purification | 260 |
| Table 11.1 Hydrostratigraphic Units Assigned in Previous and Current Studies | 273 |
| Table 11.2 Specific Yield values assigned to the Hydrogeological Units (Mean) | 275 |
| Table 11.3 ID Interpolation Parameters | 282 |
| Table 11.4 Key Statics of Datasets Used | 282 |
| Table 11.5 Drill Platform Density and Preliminary Classification by Elevation Interval | 286 |
| Table 11.6 Summary of 2026 Lithium Mineral Resource Estimate - Exclusive of Mineral Reserves (1-12) | 288 |
| Table 11.7 Comparison Between the Current and Previous (Burga et al., 2025) Mineral Resource Estimates | 290 |
| Table 12.1 Summary of Mountain Front Recharge | 301 |
| Table 12.2 Definition Points for the Numerical Model Segments | 303 |
| Table 12.3 Summary of Assigned Aquifer Parameter Estimates | 307 |
| Table 12.4 Summary of Model Boundary Fluxes | 313 |
| Table 12.5 Projected Annual Results from 2026 Mineral Reserve Estimate Model | 322 |
| Table 12.6 Summary of 2026 Mineral Reserve Estimate (1-13) | 324 |
| Table 12.7 Comparison of Mineral Reserve Estimates - Current and Previous (Burga et al. 2025) | 327 |
| Table 13.1 Borehole Drilling Summary for Infill Producing Wells Program Conducted in 2024 | 332 |
| Table 13.2 Volume Pumped per Production Well per Year and Average Flow per Year - Cauchari-Olaroz | 333 |
| Table 15.1 Production Wells Estimate | 361 |
| Table 16.1 Average Pricing Scenarios Adopted for the Economic Analysis of the Project | 382 |
| Table 17.1 Compliance with Regulations and Standards | 390 |
| Table 17.2 Summary of Key Permitting Milestones | 392 |
| Table 17.3 Key Aspects of Decree No. 7751-DEyP-2023 | 394 |
| Table 17.4 Exploration Permits | 395 |
| Table 17.5 Exploitation Permits | 397 |
| Table 17.6 Industrial Water Permits and Concessions for Cauchari-Olaroz | 398 |
| Table 18.1 Lithium Carbonate Plant Capital Costs Summary | 408 |
| Lithium Argentina AG., 2026 Cauchari-Olaroz S-K 1300 Technical Report | |
| Cauchari-Olaroz Salars, Argentina | Page xiv |
| Table 18.2 Production Wells Capital Cost | 408 |
| Table 18.3 Evaporation and Concentration Ponds Capital Cost | 408 |
| Table 18.4 Lithium Carbonate Plant Capital Cost Summary | 409 |
| Table 18.5 Reagent Costs | 409 |
| Table 18.6 Offsite Infrastructure Costs | 410 |
| Table 18.7 Onsite Infrastructure and General Capital Cost Summary | 410 |
| Table 18.8 Project Indirect Costs | 411 |
| Table 18.9 Operating Costs Summary | 412 |
| Table 20.1 Production From Rio Tinto's Olaroz Project - 2021 - 2023* | 419 |
| Table 20.2 Mineral Resource Estimate for Arcadium's Olaroz JV Project In Tonnes of Lithium Metal (1-10) | 419 |
| Table 20.3 Mineral Resource Estimate for Arcadium's Cauchari JV Project in Tonnes of Lithium Metal (1-7) | 422 |
| Table 20.4 Mineral Reserve Estimate for Arcadium's Cauchari JV Project in Tonnes of Lithium Metal (1-7) | 423 |
| Table 21.1 Analysis of Five-Stage Simulated Extraction Experiment | 443 |
| Table 21.2 Analysis of Five-Stage Simulated Extraction Experiment Data | 443 |
| Table 21.3 Experimental Data of PPG Li-Rich Brine Tank Extraction Operation | 445 |
| Table 21.4 Summary of Experimental Data | 448 |
| Table 21.5 Analysis of PPG Brine Feed for Extraction Batch Operation Data | 449 |
| Table 21.6 Analysis of Raffinate from Extraction Batch Operation | 449 |
| Table 21.7 Analysis Data of Stripping Solution | 450 |
| Table 21.8 LCE Production Schedule for Both Stages | 452 |
| Table 21.9 Cauchari Wells Location | 456 |
| Table 21.10 Summary of Well Management Risks and Remedies | 457 |
| Table 21.11 Operating Criteria | 459 |
| Table 21.12 Brine Chemistry Example | 461 |
| Table 21.13 Salt Quantity for the 45,000 tpa Production | 466 |
| Table 21.14 Preconcentrated Brine | 467 |
| Table 21.15 Basic Parameters of Solvent Extraction | 467 |
| Table 21.16 Material Name Basic Parameters of Solvent Extraction | 469 |
| Table 21.17 Analyses of Main Solvent Extraction Streams | 469 |
| Table 21.18 Material Balance of the Raffinate Resin Organic Removal Process | 470 |
| Table 21.19 Boron Removal Mass Balance | 471 |
| Table 21.20 Mass Balance for Ca Removal | 472 |
| Table 21.21 Material Balance of Removal CO32- | 473 |
| Table 21.22 Neutralization Process Material Balance | 474 |
| Table 21.23 Secondary Purification TOC Removal Mass Balance | 474 |
| Table 21.24 Brine Specification and Mass Balance for Ca Ion Exchange | 475 |
| Table 21.25 Secondary Purification - Boron Ion Exchange | 475 |
| Table 21.26 Lithium Carbonate Plant Mass Balance | 476 |
| Table 21.27 Power Consumption for 45,000 tpa Production | 481 |
| Table 21.28 Heat and Steam Consumption | 482 |
| Table 21.29 Raw Water Consumption for 45,000 tpa of Production | 487 |
| Table 21.30 Annual Consumptions of Reagents | 488 |
| Table 21.31 Average Pricing Scenarios Adopted for the Economic Analysis of the Project Pricing Scenarios | 496 |
| Table 21.32 5-year Average Spot Price of Battery Grade LCE | 496 |
| Table 21.33 Exploitation Permits for the Expansion | 498 |
| Table 21.34 Exploitation Permits for the Expansion | 499 |
| Table 21.35 Industrial Water Permits and Concessions for Cauchari-Olaroz Expansion | 499 |
| Lithium Argentina AG., 2026 Cauchari-Olaroz S-K 1300 Technical Report | |
| Cauchari-Olaroz Salars, Argentina | Page xv |
| Table 21.37 Capital Estimate for Evaporation Ponds and Wells | 514 |
| Table 21.38 Cost Summary of Process Plants | 514 |
| Table 21.39 Other Capital Investments | 516 |
| Table 21.40 CAPEX for The Salts Stockpile Area and Process Waste | 517 |
| Table 21.41 Sustaining CAPEX 45,000 tpa LCE | 517 |
| Table 21.42 Capital Cost Summary | 519 |
| Table 21.43 Personnel and Cost | 521 |
| Table 21.44 Electricity Consumption | 522 |
| Table 21.45 Reagents Cost Summary | 523 |
| Table 21.46 Water Use | 523 |
| Table 21.47 Annual Operating Cost Summary | 524 |
| Table 21.48 The Key Inputs to Economic Analysis | 527 |
| Table 21.49 Capital Expenditures Spend Schedule | 528 |
| Table 21.50 Discounted Cash Flow Summary | 530 |
| Table 21.51 Economic Evaluation - Case 1 (Base Case Summary) | 531 |
| Table 21.52 Sensitivity Analysis | 532 |
| Table 21.53 Discount Rate Variation | 533 |
| Table 23.1 Recommendations Budget | 546 |
| Lithium Argentina AG., 2026 Cauchari-Olaroz S-K 1300 Technical Report | |
| Cauchari-Olaroz Salars, Argentina | Page xvi |
List of Figures
| Figure 1.1 Ownership Structure | 16 |
| Figure 1.2 Overall Process Block Diagram | 25 |
| Figure 1.3 Simplified Overall Process Flowsheet | 38 |
| Figure 3.1 Location of Cauchari-Olaroz | 59 |
| Figure 3.2 Exar Property Claims at Cauchari-Olaroz | 61 |
| Figure 4.1 Regional Topography and Population Centres Near Cauchari-Olaroz | 78 |
| Figure 4.2 Location of Local Meteorological Stations | 80 |
| Figure 4.3 Record of Average Monthly Rainfall for the Study Area | 81 |
| Figure 4.4 Monthly Evapotranspiration | 82 |
| Figure 4.5 Record of Average Monthly Temperatures - Davis Station | 83 |
| Figure 4.6 Record of Average Monthly Temperatures - Campbell North Station | 83 |
| Figure 4.7 Annual Maximum and Minimum Temperatures - Davis Weather Station | 84 |
| Figure 4.8 Annual Maximum and Minimum Temperatures - Campbell North Weather Station | 85 |
| Figure 4.9 Average Monthly Relative Humidity for the Study Area | 86 |
| Figure 4.10 Average Monthly Atmospheric Pressure for the Study Area | 86 |
| Figure 4.11 Wind Rose Plot - Davis Weather Station | 89 |
| Figure 4.12 Wind Speeds (km/h) 2023-2025 - Davis Weather Station | 90 |
| Figure 4.13 Average Wind Speed Records (km/h) - Davis Weather Station | 91 |
| Figure 4.14 Wind Rose Plot - Campbell North Weather Station | 92 |
| Figure 4.15 Wind Speeds (km/h) Period 2024 to 2025 - Campbell North Weather Station | 93 |
| Figure 4.16 Average Wind Speed Records (km/h) - Campbell North Weather Station | 94 |
| Figure 4.17 Monthly Solar Irradiance (MJ/m²) for the Study Area | 94 |
| Figure 4.18 Average Annual Daily Solar Irradiance (W/m2) - 2023 - 2025 - Davis Weather Station | 95 |
| Figure 4.19 Maximum Solar Radiation Recorded (W/m2) - Period 2023 - 2025 - Davis Weather Station | 96 |
| Figure 4.20 Average Annual Daily Solar Irradiance (W/m2) - Period 2024 to 2025 - Campbell North Weather Station | 97 |
| Figure 4.21 Maximum Solar Radiation Recorded (W/m²) - 2024 to 2025 - Campbell North Weather Station | 98 |
| Figure 4.22 Air Quality Sampling Points | 100 |
| Figure 4.23 Ambient Noise Sampling Points | 104 |
| Figure 4.24 Historical Noise Quality Results and the Threshold Values Established by International Regulations | 106 |
| Figure 6.1 Regional Geology in the Vicinity of the Exar Project | 111 |
| Figure 6.2 Structural Features in the Central Area of the Cauchari Basin | 112 |
| Figure 6.3 Surficial Geology in the Central Area of the Cauchari Basin | 115 |
| Figure 6.4 Facies Map of the Lower Salt Cycle Showing Line 1 Crossing a Thick Salt Succession | 118 |
| Figure 6.5 Isopleth Curves of Salt Percent in the Facies Triangle | 119 |
| Figure 6.6 Main Salt Sources of the Lower Cycle | 120 |
| Figure 6.7 Facies Map of the Upper Cycle | 122 |
| Figure 6.8 Salt Percent Isopleths of the Upper Cycle | 123 |
| Figure 6.9 Isopleth Map of Sand Percents of the Upper Cycle Sedimentation Stage | 124 |
| Figure 6.10 Caucharri-Olaroz Watershed | 126 |
| Figure 6.11 Janecke Classification of Brines | 128 |
| Figure 7.1 Seismic Tomography Lines - 2009 and 2010 | 134 |
| Figure 7.2 Seismic Tomography Results for the 12 Survey Lines in Figure 7.1 | 135 |
| Lithium Argentina AG., 2026 Cauchari-Olaroz S-K 1300 Technical Report | |
| Cauchari-Olaroz Salars, Argentina | Page xvii |
| Figure 7.3 Location of Gravity Survey Lines at the Cauchari Salar | 137 |
| Figure 7.4 Modeling Results for the Northeast Oriented Gravity Line (Grav 1) Over the Mineral Resource Estimate | 138 |
| Figure 7.5 Modeling Results for the North-South Gravity Line (Grav 2) Across the Southwest Portion of the Mineral Resource Estimate | 139 |
| Figure 7.6 Location of TEM Sounding Profiles Conducted at the Cauchari Salar | 141 |
| Figure 7.7 2010 Survey Results for Line TEM 1 | 142 |
| Figure 7.8 2010 Survey Results for Line TEM 2 | 143 |
| Figure 7.9 2010 Survey Results for Line TEM 3 | 144 |
| Figure 7.10 2010 Survey Results for Line TEM 4 | 145 |
| Figure 7.11 2010 Survey Results for Line TEM 5 | 146 |
| Figure 7.12 2017 Survey Results for Line TEM 1 | 147 |
| Figure 7.13 2017 Survey Results for Line TEM 2 | 147 |
| Figure 7.14 2017 Survey Results for Line TEM 3 | 148 |
| Figure 7.15 2010-2011 Map of VES Survey Area | 149 |
| Figure 7.16 2010-2011 VES Survey Interpretation on the Archibarca Fan, Along Line VI | 151 |
| Figure 7.17 2010-2011 VES Survey Interpretation Along Line 2 | 152 |
| Figure 7.18 2010-2011 VES Survey Interpretation Along Line 8 | 153 |
| Figure 7.19 2010-2011 VES Survey Interpretation Along Line 20 | 154 |
| Figure 7.20 2019 VES Survey Area | 155 |
| Figure 7.21 2019 VES Survey Interpretation Along Line A | 156 |
| Figure 7.22 2019 VES Survey Interpretation Along Line B | 156 |
| Figure 7.23 2019 VES Survey Interpretation Along Line C | 156 |
| Figure 7.24 2019 VES Survey Interpretation Along Line D | 157 |
| Figure 7.25 2019 VES Survey Interpretation Along Line E | 157 |
| Figure 7.26 2019 VES Survey Interpretation Along Line F | 157 |
| Figure 7.27 2019 VES Survey Interpretation Along Line G | 158 |
| Figure 7.28 2019 VES Survey Interpretation Along Line H | 158 |
| Figure 7.29 2019 VES Survey Interpretation Along Line I | 158 |
| Figure 7.30 2019 VES Survey Interpretation Along Line J | 159 |
| Figure 7.31 2019 VES Survey Interpretation Along Line K | 159 |
| Figure 7.32 2020 VES Survey Area | 160 |
| Figure 7.33 2020 VES Survey Interpretation Along Line A-A' | 160 |
| Figure 7.34 2020 VES Survey Interpretation Along Line B-B' | 160 |
| Figure 7.35 2020 VES Survey Interpretation Along Line C-C' | 161 |
| Figure 7.36 2020 VES Survey Interpretation Along Line D-D' | 161 |
| Figure 7.37 2020 VES Survey Interpretation Along Line E-E' | 161 |
| Figure 7.38 2020 VES Survey Interpretation Along Line F-F' | 162 |
| Figure 7.39 2020 VES Survey Interpretation Along Line G-G' | 162 |
| Figure 7.40 2021 VES Survey Area | 163 |
| Figure 7.41 2021 VES Survey Interpretation Along Line A | 163 |
| Figure 7.42 2021 VES Survey Interpretation Along Line B | 164 |
| Figure 7.43 2024 VES Survey Area | 165 |
| Figure 7.44 2024 VES Survey Interpretation | 166 |
| Figure 7.45 Boundary Investigation Map Showing Test Pit Transects and Multi-level Monitoring Well Nests | 167 |
| Figure 7.46 Surface Water Flow Monitoring Sites | 171 |
| Figure 7.47 Average Depth to Static Water Levels in Shallow Wells (50 m) | 183 |
| Figure 7.48 Average Depth to Static Water Levels in Intermediate Depth Wells (250 - 300 m) | 184 |
| Figure 7.49 Average Depth to Static Water Levels in Deep Wells (450 - 600 m) | 185 |
| Lithium Argentina AG., 2026 Cauchari-Olaroz S-K 1300 Technical Report | |
| Cauchari-Olaroz Salars, Argentina | Page xviii |
| Figure 7.50 Production Wells | 187 |
| Figure 7.51 Lithium Concentrations in Samples Collected During Pump Tests | 188 |
| Figure 7.52 Lithium Concentrations in Pump Test Samples - Cauchari | 189 |
| Figure 7.53 Lithium Concentrations in Pump Test Samples - Olaroz | 190 |
| Figure 7.54 Black Sand in DD19D-001 | 200 |
| Figure 7.55 Borehole Locations and Associated Drilling Platforms | 201 |
| Figure 7.56 Pumping Well W18-05 | 205 |
| Figure 7.57 Pumping Well Locations | 212 |
| Figure 7.58 DD19D-05 Lithological Profile | 215 |
| Figure 7.59 DD19D-06 Lithological Profile | 215 |
| Figure 7.60 DD19D-07 Lithological Profile | 216 |
| Figure 7.61 DD19D-08 Lithological Profile | 216 |
| Figure 7.62 DD19D-11 Lithological Profile | 217 |
| Figure 7.63 DD19D-13 Lithological Profile | 217 |
| Figure 7.64 DD19D-15 Lithological Profile | 218 |
| Figure 7.65 DD19D-26 BIS Lithological Profile | 218 |
| Figure 7.66 2022-2024 Drill Hole Locations | 219 |
| Figure 8.1 Rock Chip Tray with Dry and Wet Samples | 221 |
| Figure 8.2 Collecting an Undisturbed Sample | 222 |
| Figure 8.3 Collecting an Undisturbed Sample from Core | 222 |
| Figure 8.4 Measuring Sediment in an Imhoff Cone | 224 |
| Figure 9.1 Due Diligence Sample Results for Lithium: February 2019 | 231 |
| Figure 9.2 Due Diligence Sample Results for Lithium: June 2019 | 233 |
| Figure 9.3 Performance of Lithium Blank Samples | 234 |
| Figure 9.4 Performance of Patron A | 236 |
| Figure 9.5 Performance of Patron B | 236 |
| Figure 9.6 Performance of Patron C | 237 |
| Figure 9.7 Performance of Standard A | 237 |
| Figure 9.8 Performance of Patron AA | 238 |
| Figure 9.9 Performance of Patron BB | 238 |
| Figure 9.10 Performance of Patron CC | 239 |
| Figure 9.11 Performance of Standard AA | 239 |
| Figure 9.12 Duplicate Samples - Exar Laboratory | 240 |
| Figure 9.13 Check Assays - Exar Laboratory Versus ASA Laboratories | 241 |
| Figure 9.14 Check Assays - Exar Laboratory Versus ASA Laboratories - November 2023 | 242 |
| Figure 9.15 Lithium Values in Well PB-4 2020-2025 | 243 |
| Figure 10.1 Evaporation Pans and Lamps | 246 |
| Figure 10.2 Dry Air Evaporation Tests | 247 |
| Figure 10.3 Li Concentration Changes in the Brine During the Evaporation Process | 247 |
| Figure 10.4 Pilot Ponds | 249 |
| Figure 10.5 Brine Evaporation | 250 |
| Figure 10.6 Water Evaporation | 250 |
| Figure 10.7 Sedimentation Rate of Limed Pulps with Different Amounts of Excess Lime | 252 |
| Figure 10.8 Extraction Isotherm at 20ºC Using Mixed Extractants | 253 |
| Figure 10.9 Re-extraction Isotherm at 20ºC Using Mixed Extractants | 254 |
| Figure 10.10 Pilot Plant (SX-Purification-Carbonation-Filtration-Washing Pulp) | 255 |
| Figure 10.11 SX Process Boron Extraction Efficiency | 256 |
| Figure 10.12 Ca and Mg Precipitation Efficiency | 257 |
| Figure 10.13 Li Precipitation Efficiency | 258 |
| Figure 10.14 Sulphate-Calcium Equilibrium Curve | 259 |
| Lithium Argentina AG., 2026 Cauchari-Olaroz S-K 1300 Technical Report | |
| Cauchari-Olaroz Salars, Argentina | Page xix |
| Figure 10.15 Example of Economic Optimization Curve | 261 |
| Figure 10.16 Equilibrium Curve of Li2CO3 Versus Ca and CO3 | 262 |
| Figure 10.17 Graph of Total Organic Carbon Versus Salinity | 263 |
| Figure 11.1 Location Map for Mineral Resource Estimate | 267 |
| Figure 11.2 Methodology for Evaluating Brine Mineral Resources and Mineral Reserves | 269 |
| Figure 11.3 Representative Plan and Section Views of the 2019 Measured, Indicated, and Inferred Mineral Resource Estimate | 271 |
| Figure 11.4 Vertical Cross Sections and Aerial View Showing the Distribution of the Hydrogeostratigraphic Units | 274 |
| Figure 11.5 Drill Hole Locations Where Porosity Analyses Were Conducted | 276 |
| Figure 11.6 Lithium Grade Interpolation for the Current Mineral Resource Estimate | 279 |
| Figure 11.7 Modelled Variogram for Li and 2-D Variogram and Directional Variograms for the Li-Domain | 280 |
| Figure 11.8 Swath Plot in X for Li Domain | 283 |
| Figure 11.9 Swath Plot in Y for Li Domain | 284 |
| Figure 11.10 Swath Plot in Z for Li Domain | 285 |
| Figure 11.11 Representative Cross Sections and Aerial View of the 2026 Measured, Indicated, and Inferred Mineral Resource Estimate | 287 |
| Figure 11.12 Comparison Between the Extension of the Current and Previous (Burga, 2025) Mineral Resource Estimates | 291 |
| Figure 12.1 Conceptual Model and Model Boundary Conditions | 296 |
| Figure 12.2 Numerical Model Grid with Inactive Cells | 298 |
| Figure 12.3 Vertical Discretization of the Geological Model in Leapfrog (top) Versus the Numerical Flow Model in GWV (bottom) | 299 |
| Figure 12.4 Direct and Lateral Precipitation Recharge Zone in the Numerical Model | 302 |
| Figure 12.5 Distribution of Evaporation Zones in the Numerical Model | 304 |
| Figure 12.6 Cells Defined with a Drain Boundary Condition to Represent the Saline Interface and Lagoon Outcrop Zone | 306 |
| Figure 12.7 Hydraulic Conductivity (m/d) for Each Model Layer | 309 |
| Figure 12.8 Piezometric Surface of the Pre-Development Model | 311 |
| Figure 12.9 Distribution of the Residuals | 312 |
| Figure 12.10 Observed Versus Calculated Residuals with Calibration Statistics for the Pre-development Model | 313 |
| Figure 12.11 Head Residuals Histogram | 314 |
| Figure 12.12 Hydraulic Conductivity Comparison Between the Pumping Test Analysis and the Model Calibrated Parameters | 315 |
| Figure 12.13 Observed Versus Calculated Piezometric Levels for the Transient Model at October 2023 | 316 |
| Figure 12.14 Distribution of the Residuals for October 2023 | 317 |
| Figure 12.15 Head Residuals Histogram | 318 |
| Figure 12.16 Average Lithium Grades from Production Wells Production Wells (2018-2025) | 319 |
| Figure 12.17 Maximum Drawdown Predicted at the Upper Part of the Aquifer for Year 2060 | 321 |
| Figure 12.18 Temporal Evolution of the Averaged Lithium Concentration Extracted from the Wellfield | 323 |
| Figure 12.19 Annual Total LCE Production from the Wellfield | 323 |
| Figure 13.1 Production Wells - Pumped Volumes per Well per Year | 334 |
| Figure 13.2 Location of Production Wells | 335 |
| Figure 13.3 Location of Production Wells Showing 2019 Mineral Resource Area | 336 |
| Figure 14.1 Process Block Diagram | 338 |
| Lithium Argentina AG., 2026 Cauchari-Olaroz S-K 1300 Technical Report | |
| Cauchari-Olaroz Salars, Argentina | Page xx |
| Figure 14.2 Evaporation Ponds at Cauchari Salar | 340 |
| Figure 14.3 Testing of Berm Material | 341 |
| Figure 14.4 Evaporation Ponds - Close Up | 341 |
| Figure 14.5 Evaporation Ponds | 342 |
| Figure 14.6 Evaporation Ponds - Transfer Pump Station | 343 |
| Figure 14.7 Lithium Plant Block Diagram | 345 |
| Figure 14.8 Boron Solvent Extraction | 347 |
| Figure 14.9 Brine Purification Processing Circuit Diagram | 348 |
| Figure 14.10 Primary Purification Processing Circuit Diagram | 349 |
| Figure 14.11 Secondary Purification Processing Circuit Diagram | 350 |
| Figure 14.12 Primary IX Circuit Diagram | 351 |
| Figure 14.13 Carbonate Removal Circuit Diagram | 352 |
| Figure 14.14 Evaporation and KCl Crystallization Diagram | 353 |
| Figure 14.15 Secondary IX Polishing Diagram | 354 |
| Figure 14.16 Lithium Carbonate Crystallization Diagram | 355 |
| Figure 14.17 Lithium Carbonation Reactor Diagram | 356 |
| Figure 14.18 Mother Liquor Diagram | 356 |
| Figure 14.19 Lithium Carbonate Drying, Micronization and Packaging Diagram | 358 |
| Figure 15.1 Aerial View - Main Facilities | 363 |
| Figure 15.2 Aerial View of Evaporation Ponds | 364 |
| Figure 15.3 Process Facility Flow Diagram | 366 |
| Figure 15.4 Project Infrastructure Camp General Layout | 371 |
| Figure 16.1 Lithium Demand in Batteries (2024) | 376 |
| Figure 16.2 EV Penetration Rate Forecast | 377 |
| Figure 16.3 BESS Global Demand Growth | 378 |
| Figure 16.4 Lithium Production (2024) by Country | 379 |
| Figure 16.5 Lithium Supply Forecast per Resource Type | 380 |
| Figure 16.6 Lithium Supply Forecast per Country | 380 |
| Figure 16.7 Projected Pricing for Battery-Quality Lithium Carbonate Used in Economic Model | 381 |
| Figure 18.1 Project Organization | 416 |
| Figure 20.1 Olaroz Project Production - 2016-2021 | 418 |
| Figure 20.2 Olaroz Project - Evaporation Ponds and Facilities | 420 |
| Figure 20.3 Adjacent Properties Showing Boundary with the Exar Property | 421 |
| Figure 21.1 Structural Features in the Central Area of the Cauchari Basin | 427 |
| Figure 21.2 Regional Geology in the Vicinity of the Exar Project | 428 |
| Figure 21.3 Surficial Geology in the Central Area of the Cauchari Basin | 431 |
| Figure 21.4 Facies Map of the Lower Salt Cycle Showing Line 1 Crossing a Thick Salt Succession | 434 |
| Figure 21.5 Isopleth Curves of Salt Percent in the Facies Triangle | 435 |
| Figure 21.6 Main Salt Sources of the Lower Cycle | 436 |
| Figure 21.7 Caucharri-Olaroz Watershed | 439 |
| Figure 21.8 Lithium Yield of PPG Li-Rich Brine | 446 |
| Figure 21.9 Lithium Content in Raffinate and Organic Phase | 446 |
| Figure 21.10 Continuous Extraction Device Diagram | 451 |
| Figure 21.11 General Wells Layout | 454 |
| Figure 21.12 Well Design | 455 |
| Figure 21.13 Simplified Overall Process Flowsheet | 460 |
| Figure 21.14 Evaporation Ponds Process | 461 |
| Figure 21.15 Accumulation Ponds Schematics | 462 |
| Figure 21.16 Layout of Evaporation Ponds and Salt Stockpiles | 464 |
| Lithium Argentina AG., 2026 Cauchari-Olaroz S-K 1300 Technical Report | |
| Cauchari-Olaroz Salars, Argentina | Page xxi |
| Figure 21.17 Evaporation Ponds Schematic and Detailed Designs | 465 |
| Figure 21.18 Location of the Expansion Solid Waste Deposit | 472 |
| Figure 21.19 Locations of Infrastructure for the Pre-existing Project and the Expansion Project | 478 |
| Figure 21.20 Location of Water System for Stage II Expansion | 483 |
| Figure 21.21 Reverse Osmosis Plant Scheme | 485 |
| Figure 21.22 Lithium Demand in Batteries | 491 |
| Figure 21.23 EV Penetration Rate Forecast | 492 |
| Figure 21.24 BESS Global Demand Growth | 492 |
| Figure 21.25 Lithium Supply Forecast per Resource Type | 494 |
| Figure 21.26 Lithium Supply Forecast per Country Type | 494 |
| Figure 21.27 Projected Pricing for Battery-Quality Lithium Carbonate Used in Economic Model | 495 |
| Figure 21.28 Capital Cost Distribution for Stage II Expansion | 519 |
| Figure 21.29 OPEX Distribution for Stage II Expansion | 525 |
| Figure 21.30 After-Tax NPV Sensitivity to CAPEX, OPEX and Price Variation | 532 |
| Figure 21.31 After-Tax IRR Sensitivity to CAPEX, OPEX and Price Variation | 533 |
| Figure 21.32 Project Schedule | 536 |
| Lithium Argentina AG., 2026 Cauchari-Olaroz S-K 1300 Technical Report | |
| Cauchari-Olaroz Salars, Argentina | Page xxii |
CERTIFICATES
CERTIFICATE OF QUALIFIED PERSON
MARK KING, PHD, P.GEO., FGC
I, Mark King, P. Geo., do hereby certify that:
1. I am an independent geological consultant contracted by Lithium Argentina AG. I am President and Senior Hydrogeologist with Groundwater Insight Inc., 3 Melvin Road, Halifax, Nova Scotia, B3P 2H5, telephone 902 223 6743, email [email protected].
2. This certificate applies to the technical report titled "2026 Cauchari-Olaroz S-K 1300 Technical Report, Jujuy Province, Argentina," (the "Technical Report") with an effective date of September 15, 2026.
3. I have the following academic and professional qualifications and experience:
a. Academic
i. B.Sc. (Geology), Dalhousie University, Halifax, Nova Scotia, 1982
ii. M.A.Sc. (Civil Eng.), Technical University of Nova Scotia, 1987
iii. Ph.D. (Earth Science), University of Waterloo, Waterloo, Ontario, 1997
b. Professional
i. Registered Professional Geoscientist (PGeo) of Nova Scotia (membership #84); Serving on Admissions Board of the Association for 15+ years
ii. Member of Association of Groundwater Scientists and Engineers (membership #3002241)
iii. Member of Canadian Institute of Mining (CIM) (membership 758876)
c. Experience and Areas of Specialization Relevant to this Technical Report
i. Technical involvement in lithium brine projects for the past 15 years, ranging from NI43-101 Reporting to Due Diligence, 40+ brine projects in Chile, Argentina, Nevada, Utah, California, Mongolia, and Germany
ii. Co-author - CIM Leading Practice Guidelines for Salar-Hosted Lithium Brine MRMR Estimation (Draft, 2025)
iii. Numerical modelling of groundwater flow and solutes in groundwater
iv. Field delineation and monitoring of solutes in groundwater
v. 35 years of experience in groundwater quality and quantity projects.
I have read the definition of "qualified person set out in S-K 1300 and certify that, by reason of my education, affiliation with a professional association and past relevant work experience, I fulfill the requirements to be a "qualified person" for the purposes of S-K 1300.
4. I visited the Property that is the subject of this Technical Report on several occasions, the most recent being in 2012.
5. I am responsible for Sections 11 and 12, along with those sections of the Summary pertaining thereto.
6. I have had prior involvement with the Property that is the subject of this Technical Report. That involvement was as an author on the Technical Reports titled "Feasibility Study Reserve Estimation and Lithium Carbonate and Potash Production at the Cauchari-Olaroz Salars, Jujuy Province, Argentina," with an effective date of July 11, 2012; "Updated Feasibility Study and Reserve Estimation and Lithium Carbonate Production at the Cauchari-Olaroz Salars, Jujuy Province, Argentina", with an effective of March 29th, 2017; "2026 Cauchari-Olaroz S-K 1300 Technical Report, Jujuy Province, Argentina" and "2026 Cauchari-Olaroz NI 43-101 Technical Report, Jujuy Province, Argentina", both reports with an effective date of February 27, 2026.
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7. As of the Effective Date of this technical report, to the best of my knowledge, information and belief, the Technical Report contains all scientific and technical information that is required to be disclosed to make the Technical Report not misleading.
Effective Date: September 15, 2026
Signing Date: November 6, 2026
{SIGNED AND SEALED} [Mark King]
_______________________________
Mark King, P.Geo.
| Lithium Argentina AG., 2026 Cauchari-Olaroz S-K 1300 Technical Report | |
| Cauchari-Olaroz Salars, Argentina | Page 2 of 559 |
CERTIFICATE OF QUALIFIED PERSON
DAVID BURGA, P.GEO.
I, David Burga, P. Geo., residing at 3884 Freeman Terrace, Mississauga, Ontario, do hereby certify that:
1. I am an independent geological consultant contracted by Lithium Argentina AG.
2. This certificate applies to the technical report titled "2026 Cauchari-Olaroz S-K 1300 Technical Report, Jujuy Province, Argentina," (the "Technical Report") with an effective date of September 15, 2026.
3. I am a graduate of the University of Toronto with a Bachelor of Science degree in Geological Sciences (1997). I have worked as a geologist for a total of 22 years since obtaining my B.Sc. degree. I am a geological consultant currently licensed by Professional Geoscientists Ontario (License No 1836). I have read the definition of "qualified person" set out in S-K 1300 and certify that, by reason of my education, affiliation with a professional association and past relevant work experience, I fulfill the requirements to be a "qualified person" for the purposes of S-K 1300. My relevant experience for the purpose of the Technical Report is:
| Exploration Geologist, Cameco Gold | 1997-1998 |
| Field Geophysicist, Quantec Geoscience | 1998-1999 |
| Geological Consultant, Andeburg Consulting Ltd. | 1999-2003 |
| Geologist, Aeon Egmond Ltd. | 2003-2005 |
| Project Manager, Jacques Whitford | 2005-2008 |
| Exploration Manager - Chile, Red Metal Resources | 2008-2009 |
| Consulting Geologist | 2009-Present |
4. I have visited the Property that is the subject of this Technical Report on January 24, 2017, February 19-21, 2019, June 10-12, 2019, and November 19-21, 2024.
5. I am responsible for Sections 2 to 9, 20, 22, 27, and co-author for Sections 1, and 21 to 24 of the Technical Report along with those sections of the Summary pertaining thereto.
6. I have had prior involvement with the Property that is the subject of this Technical Report. That involvement was as an author on the technical report titled "2026 Cauchari-Olaroz S-K 1300 Technical Report, Jujuy Province, Argentina" and "2026 Cauchari-Olaroz NI 43-101 Technical Report, Jujuy Province, Argentina", both reports with an effective date of February 27, 2026; "Operational Technical Report at the Cauchari-Olaroz Salars, Jujuy Province, Argentina," with an effective date of December 31, 2024; "Updated Feasibility Study and Mineral Reserve Estimation to Support 40,000 tpa Lithium Carbonate Production at the Cauchari-Olaroz Salars, Jujuy Province, Argentina", (the "Technical Report") with an effective of September 30th, 2020; "Updated Mineral Resource Estimate for Cauchari-Olaroz, Jujuy Province, Argentina" (the "Technical Report") with an effective of March 1st, 2019; and the technical report titled "Updated Feasibility Study and Reserve Estimation and Lithium Carbonate Production at the Cauchari-Olaroz Salars, Jujuy Province, Argentina", (the "Technical Report") with an effective of March 29th, 2017.
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| Cauchari-Olaroz Salars, Argentina | Page 3 of 559 |
7. As of the effective date of this technical report, to the best of my knowledge, information and belief, the Technical Report contains all scientific and technical information that is required to be disclosed to make the Technical Report not misleading.
Effective Date: September 15, 2026
Signing Date: November 6, 2026
{SIGNED AND SEALED} [David Burga]
_______________________________
David Burga, P.Geo.
| Lithium Argentina AG., 2026 Cauchari-Olaroz S-K 1300 Technical Report | |
| Cauchari-Olaroz Salars, Argentina | Page 4 of 559 |
CERTIFICATE OF QUALIFIED PERSON
MAREK DWORZANOWSKI, EUR ING CENG
I, Marek Dworzanowski, EUR ING, CEng, BSc(Hons), FIMMM, HonFSAIMM residing at 25 Rue Paul Doumer, 22950, Tregueux, France, do hereby certify that:
1. I am an independent process consultant contracted by Lithium Argentina AG.
2. This certificate applies to the technical report titled "2026 Cauchari-Olaroz S-K 1300 Technical Report, Jujuy Province, Argentina," (the "Technical Report") with an effective date of September 15, 2026.
3. I graduated from the University of Leeds, United Kingdom, with a BSc (Honours) in Mineral Processing in July 1980. In March 2016, I was appointed as a Visiting Adjunct Professor in Metallurgical Engineering, University of Witwatersrand, South Africa.
4. I became a Fellow of the Southern African Institute of Mining and Metallurgy (SAIMM) in 2006 and my membership number is 19594. I became a Fellow of the Institute of Materials, Minerals and Mining (IMMM) in 2020 and my membership number is 485805. I became a Chartered Engineer (CEng) with the Engineering Council of the United Kingdom in 2020, and my registration number is 357983. I became a European Engineer (EUR ING) in 2022, and my registration number is 34956.
5. I have read the definition of "qualified person" (QP) set out in S-K 1300 and by reason of my education, affiliation with a professional association and past relevant work experience, I fulfill the requirements to be a QP for the Technical Report.
6. I have over 40 years of experience in the mining industry during which time I gained a considerable amount of diverse experience in various senior roles within the areas of mineral processing and hydrometallurgy, production, project execution, project studies, technical consulting and research and development. My relevant experience in lithium brine projects for the purpose of the Technical Report includes operational reviews of producing lithium plants, process consulting support and acting as QP for a number of lithium brine projects including: Minera Salar Blanco Maricunga Project PEA and DFS (Chile), Millennial Lithium Pastos Grandes Project PEA and DFS (Argentina), Advantage Lithium Cauchari Project PEA and PFS (Argentina), NeoLithium 3Q Project DFS (Argentina), Standard Lithium Lanxess Smackover Project PEA (USA) and Standard Lithium SWA Project PFS (USA).
7. I have had prior involvement with the Property that is the subject of this Technical Report. That involvement was as an author on the technical report titled "2026 Cauchari-Olaroz S-K 1300 Technical Report, Jujuy Province, Argentina" and "2026 Cauchari-Olaroz NI 43-101 Technical Report, Jujuy Province, Argentina", both reports with an effective date of February 27, 2026; "Operational Technical Report at the Cauchari-Olaroz Salars, Jujuy Province, Argentina," with an effective date of December 31, 2024; and "Updated Feasibility Study and Mineral Reserve Estimation to Support 40,000 tpa Lithium Carbonate Production at the Cauchari-Olaroz Salars, Jujuy Province, Argentina", (the "Technical Report") with an effective date of September 30th, 2020.
8. I visited the property that is the subject of the Technical Report on 10 September 2025.
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| Cauchari-Olaroz Salars, Argentina | Page 5 of 559 |
9. I am responsible for Section 10 and Section 14 of the Technical Report along with those sections of the Summary pertaining thereto.
10. As of the effective date of this technical report, to the best of my knowledge, information and belief, the Technical Report contains all scientific and technical information that is required to be disclosed to make the Technical Report not misleading.
Effective Date: September 15, 2026
Signing Date: November 6, 2026
{SIGNED AND SEALED} [Marek Dwarzanowski]
_______________________________
Marek Dwarzanowski, EUR ING CEng
| Lithium Argentina AG., 2026 Cauchari-Olaroz S-K 1300 Technical Report | |
| Cauchari-Olaroz Salars, Argentina | Page 6 of 559 |
CERTIFICATE OF QUALIFIED PERSON
JONATHAN GIBSON P.ENG. - MINING ENGINEER/QP
I, Jonathan Gibson P.Eng., residing at 1343 Queenston Road, Cambridge, Ontario, do hereby certify that:
1. I am an mining and mineral processing engineering consultant contracted by Lithium Argentina AG.
2. This certificate applies to the technical report titled "2026 Cauchari-Olaroz S-K 1300 Technical Report, Jujuy Province, Argentina," (the "Technical Report") with an effective date of September 15, 2026.
3. I am a graduate of Dalhousie University with a Bachelor of Engineering degree in Mining, Mineral Processing and Oil & Gas (2007). I have worked as a Mining and Mineral Processing Engineer for a total of 18 years since obtaining my B.Eng. degree. I am a professional mining engineer currently licensed by the Professional Engineers of Ontario as well as the Association of Professional Engineers of Nova Scotia (License No 100126726 and 20230175 respectively). I have read the definition of "qualified person set out in S-K 1300 and certify that, by reason of my education, affiliation with a professional association and past relevant work experience, I fulfill the requirements to be a "qualified person" for the purposes of S-K 1300. My relevant experience for the purpose of the Technical Report is:
| Mining and Mineral Processing Engineer, Vale | 2007-2012 |
| Independent Professional Mining and Mineral Processing Engineer, Optimineral | 2012-present |
| Consulting Mining and Mineral Processing Engineer, BBA | 2020-2021 |
| Consulting Mining and Mineral Processing Engineer, CSU Projects | 2023-present |
I have participated in well over 2 dozen various technical reports (from prefeasibility to FEL 0-4, Multi-Discipline Engineering Reports, Trade-off studies, mineral processing flowsheet adaptations (including the supporting laboratory R&D), Backfill and mine ventilation capital projects to start-up/commissioning of material handling circuits and several mine closure plans) as well as being the QP of record and/or author of over half a dozen SEC reported technical reports (Vale, CSU Projects & BBA).
4. I have not visited the Property that is the subject of this Technical Report.
5. I am responsible for Sections 12, 13, 15, and 16, and co-author for Section 19 and of the Technical Report along with those sections of the Summary pertaining thereto.
I have had prior involvement with the Property that is the subject of this Technical Report. That involvement was as an author on the technical report titled "2026 Cauchari-Olaroz S-K 1300 Technical Report, Jujuy Province, Argentina" and "2026 Cauchari-Olaroz NI 43-101 Technical Report, Jujuy Province, Argentina", both reports with an effective date of February 27, 2026.
6. As of the effective date of this technical report, to the best of my knowledge, information and belief, the Technical Report contains all scientific and technical information that is required to be disclosed to make the Technical Report not misleading.
| Lithium Argentina AG., 2026 Cauchari-Olaroz S-K 1300 Technical Report | |
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Effective Date: September 15, 2026
Signing Date: November 6, 2026
{SIGNED AND SEALED} [Jonathan Gibson]
_______________________________
Jonathan Gibson, P.Eng.
| Lithium Argentina AG., 2026 Cauchari-Olaroz S-K 1300 Technical Report | |
| Cauchari-Olaroz Salars, Argentina | Page 8 of 559 |
CERTIFICATE OF QUALIFIED PERSON
ALEXANDER M. L. CUSHING, P.ENG.
I, Alexander Cushing, P. Eng., residing at 243 Albright Road, Hamilton, Ontario, do hereby certify that:
1. I am an independent mineral processing, metallurgical and mineral economics consultant contracted by Lithium Americas (Argentina) Corp.
2. This certificate applies to the technical report titled "2026 Cauchari-Olaroz S-K 1300 Technical Report, Jujuy Province, Argentina," (the "Technical Report") with an effective date of September 15, 2026.
3. I am a graduate of McMaster University with a Bachelor of Engineering degree in Chemical Engineering (2011), Queen's University, Kingston with a Master of Applied Science (2014) and Doctorate of Philosophy (2018) in Mining Engineering, and the University of Toronto with a Master of Finance. I have worked as an engineer for over 10 years since obtaining my B.Eng degree. I am an engineering consultant currently licensed by Professional Engineers Ontario (License No 100555075). I have read the definition of "qualified person" set out in S-K 1300 and certify that, by reason of my education, affiliation with a professional association and past relevant work experience, I fulfill the requirements to be a "qualified person" for the purposes of S-K 1300. My relevant experience for the purpose of the Technical Report is:
| Metallurgist, SGS Lakefield | 2018 - 2020 |
| Consulting Engineer, Ioniq (formerly CSU Projects) | 2020 - 2021 |
| Senior Analyst, Vale Canada | 2021 - 2022 |
| Consulting Engineer, Ioniq (formerly CSU Projects) | 2022 - Present |
4. I have not visited the Property that is the subject of this Technical Report.
5. I am responsible for Sections 16 and 18, and co-author for Sections 1, 21 to 24 of the Technical Report along with those sections of the Summary pertaining thereto.
6. I have had prior involvement with the Property that is the subject of this Technical Report. That involvement was as an author on the technical report titled "2026 Cauchari-Olaroz S-K 1300 Technical Report, Jujuy Province, Argentina" and "2026 Cauchari-Olaroz NI 43-101 Technical Report, Jujuy Province, Argentina", both reports with an effective date of February 27, 2026.
7. As of the effective date of this technical report, to the best of my knowledge, information and belief, the Technical Report contains all scientific and technical information that is required to be disclosed to make the Technical Report not misleading.
Effective Date: September 15, 2026
Signing Date: November 6, 2026
| Lithium Argentina AG., 2026 Cauchari-Olaroz S-K 1300 Technical Report | |
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{SIGNED AND SEALED} [Alexander Cushing]
_______________________________
Alexander Cushing, P.Eng.
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CERTIFICATE OF QUALIFIED PERSON
JAMES WANG, P.E.
As the co-author of the report titled "2026 Cauchari-Olaroz S-K 1300 Technical Report, Jujuy Province, Argentina," (the "Technical Report") with an effective date of September 15, 2026, I, James Wang, P.E., do hereby certify that:
1. I am a director and executive consultant with Golder Associates, a wholly owned division of WSP Global Inc. (local office address: 1111 Azia Center, Beijing, China; head office address: 1600 Rene Levesque Blvd. West, Montreal, QC H3H 1P9, Canada). My listed home address is 891 Miami Ridge Drive, Loveland, Ohio, U.S.A.
2. Since graduating with a Bachelor's degree in civil engineering in China in 1992 and a Master's degree in geotechnical engineering in the U.S. in 1994, I have practiced my profession continuously for 30 years. I have held positions with D'Appolonia Consultants, Terracon Consultants, Golder Associates, and WSP Golder in the U.S. and China. I have been a registered Professional Engineer (P.E.) with the State of Ohio (Registration #63824) since 1999 and a registered Professional Engineer (P.E.) with the State of West Virginia (Registration #15545) since 2002.
3. Over the past 31 years, I have completed over 90 projects in the mining sector in the Americas, Asia, and Africa. My areas of expertise include geotechnical/mining engineering, hydrogeology, process engineering, mining technical economics and valuation, and mine waste disposal. Over the past 12 years, I have served as the project director and Qualified Person for over 10 large size lithium brine projects in Argentina and Chile. I have also managed technical due diligence reviews on over 12 lithium projects (both brine projects and hard rock projects) in the Americas over the past 15 years for mining companies and investment funds.
4. I have read the definition of "qualified person" set out in S-K 1300 and certify that and by reason of my education, past relevant experience, professional registrations, and affiliation with professional associations I fulfill the requirements to be a "Qualified Person" for the purposes of S-K 1300.
4. I have not visited the Property that is the subject of this Technical Report.
5. As a qualified person (QP) for this project, I have been responsible for authoring or co-authoring Sections 17 and 21 of this Technical Report along with those sections of the Executive Summary pertaining thereto.
6. As for the effective date of this technical report, to the best of my knowledge, information and belief, the Technical Report contains all scientific and technical information that is required to be disclosed to make the Technical Report not misleading.
Effective Date: September 15, 2026
Signing Date: November 6, 2026
| Lithium Argentina AG., 2026 Cauchari-Olaroz S-K 1300 Technical Report | |
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{SIGNED AND SEALED} [James Wang]
__________________________________
Signature of James Wang, P.E.
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