27 November 2025

East Star Resources Plc

("East Star" or the "Company")

Two New Porphyry Licences Awarded

East Star Resources Plc (LSE:EST), the Kazakhstan-focused gold and base metals explorer, is pleased to announce it has been awarded two new licences in the Balkash-Ili Arc in Kazakhstan. The new licences comprise the Piket and Judzha projects. The licences were acquired under the first-come-first-serve system in Kazakhstan as a result of desktop and field studies targeting copper porphyry deposits.

Highlights:

·    Two licences, prospective for Cu-Au porphyry and related systems have been granted to East Star

·    Very large 8km x 3km alteration system in the Piket licence, dominated by Advanced Argillic Alteration; similar age and setting to the Macquarie Arc in Australia which is host to world class Cu-Au porphyry and epithermal deposits

·    Anomalous gold up to 0.27g/t recorded in rock chips from Piket Project

·    Anomalous silver up to 4.56g/t recorded in breccias from the Judzha Project

Alex Walker, CEO of East Star Resources, commented:

"The East Star team has worked hard over the last two field seasons to generate and assess more than 20 areas prospective for porphyry and epithermal gold deposits. As a result, we are excited to announce the grant of the next two licences in the portfolio prospective for copper porphyry deposits. Since applying for the licences, the team has mapped the prospects, laying the foundation for the next season's fieldwork. While the Licences are situated within the joint venture area of interest with Endeavour Mining, the targeting was focussed on copper porphyry deposits and so have been excluded from the joint venture."

Next Steps

Data collection and compilation from the state archives is ongoing and will be completed over the Kazakh winter season. The key focus of this work is to understand what work was completed by the Soviets and to compile the historical assay results from the multiple trenches, which have been identified through mapping at the two projects. Additionally, rock chips from recent mapping will be submitted for assay once the data compilation is completed, in time to inform the work programme for the 2026 field season.

The Piket Project

The Piket Project ("Piket") is located approximately 80km south of the city of Karaganada and approximately 20km west of the town of Shopa on the main Astana-Almaty highway, with excellent access to the project area via a network of farm tracks. The project appears as a large volcanic edifice composed of a central core of variably altered andesitic volcanic rocks, which has been intruded by a monzonite in the south. Figures 1 and 2 below illustrate the results of the recently completed Piket mapping.

The project displays the following key attributes, which demonstrate its potential fertility:

1.    Anomalous geochemistry: Initial rock chip samples returned up to 0.269 g/t gold in quartz veins along the eastern margin of the intrusive. This highly anomalous gold is regarded as a strong indicator of system fertility. Additionally, epithermal veins, which were trenched in Soviet times, have been identified around 5km to the east of Piket. These veins demonstrate the preservation of the epithermal environment.

2.    Extensive alteration: Piket displays extensive argillic alteration in the north and the south and at least two areas of extensive alunite veining have been observed through the mapping. Alteration is strongest in the southern part of the license area with extensive quartz-pyrophyllite alteration observed at surface. Pyrophyllite is diagnostic of the higher temperature parts of the porphyry lithocap environment and is used a key vector to the hottest and therefore most prospective parts of the system.

3.    Alkaline affinity: The monzonitic rocks in the project area display alkalic alteration, which is a key feature of other prospective porphyry belts, such as the Macquarie Arc in Australia. The arc has produced world class Cu and Au bearing porphyry systems, such as Cadia-Ridgeway and North Parkes. Recognition of this alkalic intrusive event supports the potential for exploration for this style of mineralisation, which has been hitherto unrecognised in Kazakhstan.