Sayona Mining NAL Reserves Surge 124% to 48.6Mt

TL;DR

Sayona's NAL lithium reserves just jumped 124% to 48.6Mt, with total resources hitting 95Mt. Big news for battery metals!

AI Summary

Sayona Mining Limited announced on August 27, 2025, significant updates to its North American Lithium (NAL) operation and Authier project. The JORC Mineral Resource and Ore Reserve Estimates show NAL reserves have increased by 124% to 48.6 million tonnes (Mt), and the total resource has grown to 95 Mt. This expansion highlights the growing potential of Sayona's lithium assets.

Why It Matters

This substantial increase in reserves and resources at the NAL operation and Authier project indicates a stronger, longer-term supply of lithium, a critical component for electric vehicle batteries.

Risk Assessment

Risk Level: medium — While the resource increase is positive, the company's financial health and the volatile nature of commodity prices present ongoing risks.

Key Numbers

• 48.6Mt — NAL Reserves (Represents a 124% increase, indicating significant growth in extractable lithium.)
• 95Mt — Total Resource (Shows the overall potential of Sayona's lithium assets.)
• 124% — Reserve Increase (Highlights the substantial expansion of NAL's proven reserves.)

Key Players & Entities

• Sayona Mining Limited (company) — Registrant and operator of NAL and Authier projects
• North American Lithium (NAL) (company) — Operation with updated resource and reserve estimates
• Authier project (company) — Project with updated resource and reserve estimates
• Piedmont Lithium (company) — 25% partner in NAL and Authier projects
• 48.6Mt (dollar_amount) — Updated NAL reserves
• 95Mt (dollar_amount) — Updated total resource
• August 27, 2025 (date) — Date of the announcement

FAQ

Key Financial Figures

• $100 — ries, except for mining costs being at C$100/t. 12. The number of tonnes has been
• $1,395 — pit shell based on a selling price of US$1,395 per tonne of Li 2 O concentrate at 5.4%

Filing Documents

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From the Filing

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of August 2025 Commission File Number 001-42819 SAYONA MINING LIMITED (Translation of registrant's name into English) Level 28, 10 Eagle Street Brisbane, Queensland 4000 Australia (Address of principal executive office) Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F. Form 20-F Form 40-F NAL Reserves up 124% to 48.6Mt and Resource increases to 95Mt North American lithium producer Sayona Mining Limited ("Sayona") (ASX:SYA; OTCQB:SYAXF) announced today results from the updated JORC Mineral Resource and Ore Reserve Estimates at its North American Lithium (NAL) operation and Authier project (Sayona 75%; Piedmont Lithium 25%), demonstrating the potential of these highly strategic assets. Highlights Total Mineral Resource estimate at NAL increased to 95.0Mt at 1.15% Li 2 O with additional drilling from 2024. This is an increase in NAL Mineral Resources of 8% compared to the previous estimate released on 27 August 2024 which includes the update of the spodumene price and other economic assumptions (see Figure 1). Total Ore Reserves at NAL increased to 48.6Mt at 1.11% Li 2 O with the inclusion of drilling from 2023 and 2024. This is an increase in Ore Reserves at NAL of 124% compared to the previous estimate released on 31 March 2023. The NAL estimate is based on a new geological model, the latest economic parameters and an updated mine plan. Total Ore Reserves at Authier decreased by 6% to 10.5Mt at 1.00% Li 2 O due to increase in cut-off grade to 0.60% Li 2 O. There is no change to the Mineral Resource estimate at Authier. Mineral Resource and Ore Reserves reported are in compliance with the JORC Code (2012 Edition). 2025 NAL JORC Mineral Resource Estimate Resource Classification Method Tonnes (Mt) Li 2 O Grade (%) Cut-off Grade (%) Indicated Open Pit 76.2 1.17 0.60 Inferred Open Pit 8.6 1.13 0.60 Indicated Underground - - - Inferred Underground 10.3 1.01 0.70 Total 95.0 1.15 2025 NAL JORC Ore Reserves Estimate Reserve Category Tonnes (Mt) Li 2 O Grade (%) Cut-off Grade (%) Fe 2 O 3 Grade (%) Proved Ore Reserves 0.3 1.01 0.60 1.55 Probable Ore Reserves 48.2 1.11 0.60 0.82 Total 48.6 1.11 0.60 0.83 Level 28, 10 Eagle St Brisbane Q 4000 | +61 7 3369 7058 info@sayonamining.com.au | ASX: SYA | ACN 091 951 978 2025 Authier JORC Ore Reserves Estimate Reserve Category Tonnes (Mt) Li 2 O Grade (%) Cut-off Grade (%) Fe 2 O 3 Grade (%) Proved Ore Reserves 5.7 0.97 0.60 1.06 Probable Ore Reserves 4.9 1.03 0.60 1.22 Total 10.5 1.00 0.60 1.13 Mineral Resource Estimate and Ore Reserves Estimate Details Sayona has increased its Canadian lithium resource base with this updated JORC Mineral Resource estimate for its North American Lithium (NAL) operation and Authier project. Results from the updated MRE reinforce the projects' potential for an extended mine life and/or increased production rate. Sayona now has a total estimated JORC Indicated and Inferred Mineral Resource of 95 million tonnes at 1.15% Li 2 O at a cut-off grade of 0.60% Li 2 O for open pit and 0.70% Li 2 O for underground at NAL. This is an increase of 8% from the previous MRE (August 2024) of 87.9 million tonnes (Mt) at 1.13% Li 2 O. Approximately 80% of the total NAL tonnage is in the higher confidence Indicated category. There are no measured resources at NAL. The mineral resources are constrained within a resource level conceptual pit shell for open pit and stope optimiser shapes for the underground. Sayona's Managing Director and CEO, Lucas Dow commented, " This outstanding increase in Reserves and Resources highlights the world-class nature of NAL and its importance to Sayona's growth story. More than doubling our NAL Reserves provides a robust foundation for a long mine life and the flexibility to consider expanded production. "As the largest operating spodumene mine in Canada and North America, NAL is uniquely positioned to supply the region's fast-growing battery and EV markets. This is a tremendous outcome that reflects the quality of the orebody, the success of recent drilling, and the strength of our technical team. "With this update, NAL is cemented as a flagship operation capable of delivering sustained value to our shareholders, our partners, and the global clean energy supply chain." The NAL Ore Reserves have been estimated with an effective date of 30 June 2025. A total of 48.6Mt of Proven and Probable Ore Reserves are estimated at an average grade of 1.11% Li 2 O, which is comprised of 0.3Mt of Proven Ore Reserves at an average grade of 1.01% Li 2 O and 48.2Mt of Probable Ore Reserves at an average grade of 1.11% Li 2 O. The updated NAL Ore Reserves

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