Increased resources at Laguna Verde based on recent license acquisition

CleanTech Lithium PLC (“CleanTech Lithium” or “CleanTech” or the “Company”) (AIM: CTL, Frankfurt:T2N), an exploration and development company advancing sustainable lithium projects in Chile, announces an updated resource estimate for its Laguna Verde project following the recent acquisition of additional licenses for the project. Laguna Verde is one of six salaries selected by the Chilean government to be prioritized for development by private companies.

Highlights:

• The mineral resource estimate has been updated from that reported on January 20, 2025, based on the recent acquisition of additional licenses for the project, as reported to the market on August 11, 2025
• The updated total resource is 1.9 million tons of lithium carbonate equivalent (LCE), with a grade of 174 mg/l lithium, an increase of 17% from the previous total resource of 1.63 million tons of LCE
• 0.84 million tonnes of LCE falls into the Measured + Indicated category with a lithium content of 178 mg/l
• The additional licenses were obtained to meet government licensing area requirements for participation in the streamlined Special Lithium Exploitation Contract (CEOL) process.
• The Chilean government is finalizing consultations with the indigenous community for Laguna Verde and the streamlined process is expected to be announced shortly thereafter
• The JORC (2012) compliant estimate was calculated by Montgomery & Associates (“Montgomery'” or “M&A”), a leading hydrogeological consultant with extensive experience in estimating lithium brine resources.
• The resource estimate is based on three years of annual exploration programs completed by CTL between 2022 and 2024, including drilling programs, pump test programs and geophysics surveys
• Montgomery recommends three additional drill holes in the southwest, north and northeast to potentially increase resources
• The measured and indicated resource estimate will be used in the ongoing pre-feasibility study (PFS), which is intended to inform an initial reserve estimate for the Laguna Verde project.

Ignacio Mehech, CEO, CleanTech Lithium said: “The updated JORC compliant resource estimate for the Laguna Verde project, independently determined by Montgomery & Associates, confirms a robust and significant resource of 1.9 million tonnes of lithium carbonate equivalent (LCE) with an average grade of 174 mg/l lithium, with 0.84 million tonnes in the Measured and Indicated category. The resource estimate is a key part of the project’s pre-feasibility study, which is nearing completion. This positions Laguna Verde as a leading direct lithium extraction (DLE) project in Chile’s lithium sector and as a future producer for the global EV and battery market.

Further details:

Background on updated resource estimation

Laguna Verde’s previous total resource estimate of 1.63 million tons of LCE was based on the company’s proposed CEOL polygon. Of this total resource estimate, 1.21 million tons of LCE was based on the Company’s preferential licensing area within that polygon, and 0.42 million tons of LCE was classified as provisional based on the total proposed CEOL area. In August 2025, the company acquired another 30 licenses from Minergy Chile SpA, with the main objective of increasing the preferential licensing position within the government-defined CEOL polygon, as shown in Figures 1 and 2. The acquisition increased the company’s preferential licensing position within the government-defined polygon to 97.6% of the area, exceeding an 80% threshold required by the government to consider a streamlined CEOL process for Laguna Verde. The updated resource estimate of 1.9 million tons of LCE is based on the expanded preferential licensing area in Figure 2.

Fig. 1: Extent of previous preferential licenses and government. CEOL polygon

Fig. 2: Extent of preferential license after acquisition

The resource estimate is based on annual exploration programs completed by the Company between 2022 and 2024, with rotary and diamond drill programs completed as shown in Figure 3. Additional observation wells have been drilled to support pump test observations. Three additional diamond drill holes in the southwest, north and northeast are recommended to potentially further expand the resource volume (LV08, LV09 and LV10).

Fig. 3: Existing and recommended exploration wells in Laguna Verde

Summary of sources

The technical report was prepared by Montgomery to meet the legal requirements of the JORC Code (2012). Mineral resources are also reported in accordance with the Canadian Institute of Mining, Metallurgy and Petroleum (CIM) Best Practice Guidelines (CIM, 2012). The breakdown of the categories of resources that make up the total resource is given in Table 1 below.

Mineral resources are not mineral reserves and have no demonstrated economic viability. In addition, not all mineral resources can be converted into mineral reserves after applying the modifying factors, including but not limited to mining, processing, economic and environmental factors.

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