Company: FEAV
Filing Date: 2025-11-19
Form Type: 8-K
Source: 0001193125-25-286999
Chunk: 1

Company: 5E Advanced Materials, Inc.
Filing Date: 2025-11-19
Form: 8-K
Item: Item 8.01
Chunk 1
---
Item 8.01 Other Events.

Updated Mineral Resource Estimate

On November 15, 2025, the Company received an updated mineral resource estimate for the Project. The updated mineral resource estimate was prepared by Mr. Steven Kerr of Escalante Geological Services, LLC, one of the Qualified Persons with respect to the Company’s Preliminary Feasibility Study Technical Report Summary (the “ PFS”) filed with the U. S. Securities and Exchange Commission (the “ SEC”) on Form 8-K on August 7, 2025. The new mineral resource estimate updates the prior estimate dated March 10, 2025, and incorporates mineral resource from additional lode claims the Company staked and filed with the U. S. Bureau of Land Management and recorded in San Bernardino County in August 2025.

The updated mineral resource estimate identified 61.9 million short tons of measured ore, containing 9.1 million short tons of in-situ boric acid (H3 BO3), with an average grade of 8.34% (B2 O3), and 138.6 million short tons of indicated ore, containing 19.2 million short tons of in-situ boric acid (H3 BO3), with an average grade of 7.97% (B2 O3). On a combined basis, measured plus indicated mineral resource represent 28.3 million tons of boric acid, with an average grade of 8.09% (B2 O3), which represents an increase of 10.8 million tons, or 61%, as compared to the prior resource estimate. The updated mineral resource estimate also identified an aggregate measured plus indicated mineral resource estimate of 328 thousand tons of lithium carbonate equivalent (“ LCE”), with an average grade of 0.17% LCE, an increase of 115 thousand tons, or 54%, as compared to the prior resource estimate. Each of these increases relate exclusively to the addition of mineral resource that resulted from the aforementioned additional lode claims.

The mineral reserves and Project economics previously disclosed in the Company’s PFS are unchanged as a result of the updated mineral resource estimate and remain current and valid as of the date of this Form 8-K. Additionally, the mineral resource assumptions, methodology, pricing assumptions, cut-off grade and other assumptions and estimates with respect to the Company’s mineral resource estimate, each as described in Part I, Items 1 and 2, of the Company’s Form 10-K filed with the SEC on