Smackover Lithium Files Definitive Feasibility Study for Its South West Arkansas Project, North America's Highest-Grade Reported Lithium Brine Reserve
Original announcement by tmx on
- Company
- Standard Lithium Ltd.
- Ticker
- SLI
- Exchange
- TSX
- Region
- Arkansas
- Primary commodity
- Lithium
- Secondary commodities
- None reported
- Document categories
- Resource update, Economic study
- Extracted
- 2026-09-16 23:02:17 UTC
Analysis by Minestarters Atlas
Minestarters Atlas analysis
Summary
Standard Lithium has filed a Definitive Feasibility Study (DFS) for its South West Arkansas lithium brine project. The study outlines a 20-year mine life with 447,000 tonnes of LCE in Proven Reserves and a projected 20.2% unlevered pre-tax IRR.
Reasoning: The announcement of a DFS for a high-grade lithium project with a solid 20.2% IRR and significant reserves is a major de-risking milestone for the company.
Positive factors
- Definitive Feasibility Study (DFS) filed
- High-grade lithium brine reserves reported
- Strong IRR of 20.2%
- First commercial DLE operation in the US
Negative factors
- Qualified Person is not independent
Facts used in scoring: 3
Classification and evidence
DFS Completepositive · Story-specific tag
No canonical definition is currently available.
Why it applies: The company has filed a Definitive Feasibility Study for the South West Arkansas project.
Evidence · text
“announced today that the Definitive Feasibility Study (“DFS” or the “Report”) for its South West Arkansas (“SWA”) project (the “Project” or “SWA Project”) has been filed.”
Proven Reservepositive
Measured Resource with demonstrated economic viability after applying modifying factors.
Why it applies: The DFS reports 447,000 tonnes of Proven Reserves of LCE.
Evidence · text
“producing 447,000 tonnes (Proven Reserves) of lithium carbonate equivalent (“LCE”)”
NI 43-101 Compliantpositive
Resource estimate prepared in compliance with NI 43-101 (Canada) — high reporting standard.
Why it applies: The disclosure is reviewed and approved by a Qualified Person under NI 43-101 standards.
Evidence · text
“reviewed and approved by Mr. Stephen Ross, P.Geo... for purposes of, and as that term is defined in, National Instrument 43-101”
Extracted facts
Stored fact records: 2. Some facts used in scoring do not have a stored record.
Resource Estimates (2)
indicatedSouth West Arkansas · lithiumTonnes: 1177000Contained Metal: 1177000Contained Unit: tonnes lceView all detailsHide details
Identity
- Project
- South West Arkansas
- Commodity
- lithium
- Region
- arkansas
- Reported Region
- Arkansas
- Ticker
- SLI
Resource scope
- Estimate type
- resource
- Reporting standards
- ni_43_101
- Resource group id
- resource:58eb2edbf6f0577655d5
- Resource basis
- gross
Resource Data
- Category
- indicated
- Tonnes
- 1177000
- Contained Metal
- 1177000
- Contained Unit
- tonnes lce
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2025-10-14T00:00:00.000Z
Reasoning: The resource scale is substantial for a lithium brine project.
Positive factors
- Significant M&I resource
Evidence · text
“38% of the in-situ Measured and Indicated Resources of 1,177,000 tonnes LCE.”
Tags used in scoring
Indicated Resourcepositive
Reasonable geological confidence based on adequate drilling; continuity can be assumed. Basis for Probable Reserves.
Why it applies: category is "indicated"
Cut-off Undisclosednegative
High-grade interval reported without stating the cut-off grade used for compositing.
Why it applies: no cutoff_grade was stated
NI 43-101 Compliantpositive
Resource estimate prepared in compliance with NI 43-101 (Canada) — high reporting standard.
Why it applies: reporting_standards includes ni_43_101
DFS-Supportingneutral
Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence.
Why it applies: the release names the study this estimate supports
provenSouth West Arkansas · lithiumTonnes: 447000Contained Metal: 447000Contained Unit: tonnes lceView all detailsHide details
Identity
- Project
- South West Arkansas
- Commodity
- lithium
- Region
- arkansas
- Reported Region
- Arkansas
- Ticker
- SLI
Resource scope
- Estimate type
- reserve
- Reporting standards
- ni_43_101
- Resource group id
- resource:9547e8afe71141344ecb
- Resource basis
- gross
Resource Data
- Category
- proven
- Tonnes
- 447000
- Contained Metal
- 447000
- Contained Unit
- tonnes lce
Review
- Needs Review
- No
- Historical
- No
Dates
- Event date
- 2025-10-14T00:00:00.000Z
Reasoning: The reserve grade is high for the region.
Positive factors
- High grade brine
Evidence · text
“producing 447,000 tonnes (Proven Reserves) of lithium carbonate equivalent (“LCE”)”
Tags used in scoring
Proven Reservepositive
Measured Resource with demonstrated economic viability after applying modifying factors.
Why it applies: category is "proven"
Cut-off Undisclosednegative
High-grade interval reported without stating the cut-off grade used for compositing.
Why it applies: no cutoff_grade was stated
NI 43-101 Compliantpositive
Resource estimate prepared in compliance with NI 43-101 (Canada) — high reporting standard.
Why it applies: reporting_standards includes ni_43_101
DFS-Supportingneutral
Resource estimate prepared to support a Definitive Feasibility Study — requires high M&I confidence.
Why it applies: the release names the study this estimate supports
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.