Mr. William Willoughby reports

CENTURY LITHIUM FILES MINE PLAN OF OPERATIONS FOR ANGEL ISLAND LITHIUM PROJECT IN NEVADA

Century Lithium Corp. has submitted the mine plan of operations (PoO) and Nevada reclamation permit application for the company's 100-per-cent-owned Angel Island mine project in Esmeralda county, Nevada. The PoO was submitted on Sept. 3, 2026, to the U.S. Bureau of Land Management (BLM), Battle Mountain district, Tonopah field office. The PoO is the proposed action for the project and is the document upon which the BLM will base its environmental analyses under the National Environmental Policy Act (NEPA). It was prepared in accordance with BLM surface management regulations at 43 CFR Subpart 3809 and Nevada reclamation regulations at NAC 519A.

"The submission of the mine plan of operations for Angel Island is a substantial milestone for Century Lithium," said Bill Willoughby, president and chief executive officer of Century Lithium. "It defines the project the BLM will analyze, starts the clock on the environmental review, and reflects multiple years of baseline data collection, engineering and co-ordination with the agencies. With the PoO completed, our focus turns to supporting the BLM and the third party NEPA contractor toward a final project approval through a record of decision."

The PoO describes the mine, the processing plant and the supporting infrastructure, and defines the process for reclamation of the land when mining is complete, and was submitted by the company's wholly owned subsidiary, Cypress Holdings (Nevada) Ltd., the operator of record for the project.

The Angel Island lithium project

Angel Island is an advanced-stage, sedimentary lithium project located in Clayton Valley, Esmeralda county, Nevada, approximately six miles east of Silver Peak and 41 road-miles southwest of Tonopah. The project area covers 5,379 acres of BLM-administered public land held under federal mining claims. As described in the PoO, the proposed operation would result in approximately 2,364 acres of disturbance.

Key elements of the proposed operation, as set out in the PoO, include:

• Shallow surface mine: lithium-bearing claystones allow mining in six pit phases with minimal overburden and low strip ratio. No drilling or blasting is anticipated; the ore will be ripped, loaded and hauled to the processing facility;
• Staged growth: a two-phase development, with an initial production rate of approximately 8,300 tons per day (tpd) for the first four years of operation, increasing to a maximum of up to 16,500 tpd in years five through 40;
• On-site processing to battery-grade lithium carbonate: processing by agitated tank leaching, solid/liquid separation, direct lithium extraction (DLE) and crystallization to produce battery-grade lithium carbonate. The process circuit is closed loop and designed to operate with recycled water;
• Salt-based reagents: a chlor-alkali plant will produce hydrochloric acid and sodium hydroxide, both required by the process circuit, with surplus sodium hydroxide to be sold into the open market. Sodium hydroxide is a product of the processing circuit and is not derived from material mined from the project;
• Support facilities: included are two waste rock storage facilities, two low-grade ore stockpiles, a dry-stack tailings storage facility, heavy- and light-vehicle roads, and a warehouse, office, shop and laboratory;
• Grid power: 53 megawatts (MW) in phase 1 and 106 MW in phase 2 are to be supplied by a transmission-voltage connection, with the company's preferred route tying into the new Esmeralda substation on the NV Energy Greenlink West corridor;
• Water supply: process make-up water is to be obtained under the company's existing water rights from a well approximately 11 miles south of the project and delivered to site via a buried 12-inch pipeline on BLM land, for which biological and cultural baseline surveys were completed;
• Work force: a work force of approximately 275 full-time personnel is anticipated during operations, with a temporary peak of approximately 450 during construction.

Next steps and permitting schedule

Angel Island is a transparency project under the Federal Permitting Improvement Steering Council's FAST-41 program, with the BLM as lead agency. FAST-41 status provides co-ordinated federal oversight, publicly tracked milestones and schedule transparency through the permitting dashboard for federal infrastructure projects. The permitting dashboard currently shows an estimated completion date for environmental review and permitting of Feb. 4, 2028. As with any federal schedule, the timetable may be adjusted as the review proceeds and updates are posted on the permitting dashboard.

With the PoO submitted, the BLM will complete a 30-day regulatory review of the plan for completeness and adequacy. Once the plan is deemed complete, the third party NEPA contractor will begin environmental analysis of the project, and will develop the supplemental information report (SIR) and the supplemental environmental reports (SERs) to support the NEPA document. Once the SIR and SERs are completed, the administrative environmental impact statement (EIS) can be prepared, after which the BLM is expected to publish a notice of intent in the federal register and initiate public scoping, ultimately leading to a record of decision (ROD). The anticipated sequence of milestones is summarized in the attached table.

In parallel with the federal process, the company continues to advance state and local permitting in Nevada and prepare the water pollution control permit application package, which includes detailed engineering of project components and facilities. Continuing metallurgical testwork continues in support of the Angel Island flowsheet, including definition of supporting project infrastructure, including power and water delivery.

Qualified person

The scientific and technical information in this news release was reviewed and approved by William Willoughby, PhD, PE, president and chief executive officer of Century Lithium, who is a qualified person as defined by National Instrument 43-101, Standards of Disclosure for Mineral Projects.

About Century Lithium Corp.

Century Lithium is an advanced-stage lithium development company focused on its 100-per-cent-owned Angel Island lithium project in Esmeralda county, Nevada. Angel Island hosts one of the largest known sedimentary lithium deposits in the United States and is designed with an integrated, end-to-end process for the on-site production of battery-grade lithium carbonate to support the electric vehicle and battery storage markets.

The company has developed a patent-pending process that incorporates hydrochloric acid leaching combined with direct lithium extraction to produce battery-grade lithium carbonate. As part of the integrated chlor-alkali process, Angel Island is designed to produce sodium hydroxide as a co-product, with planned surplus sales expected to lower operating costs, reduce reliance on externally sourced reagents and minimize environmental impacts.

Century Lithium is currently advancing Angel Island through the permitting process.

All inferences to mining, processing and economics for Angel Island herein are from the updated National Instrument 43-101 technical report on the feasibility of the Clayton Valley lithium project, Esmeralda county, Nevada, U.S., Jan. 3, 2026 (2026 feasibility study (FS)), which is available on SEDAR+ and the company's website.

Century Lithium trades on the TSX Venture Exchange under the symbol LCE, on the OTCQX under the symbol CYDVF and on the Frankfurt Stock Exchange under the symbol C1Z.

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