East Star Resources Plc (LSE: EST), the Kazakhstan-focused gold and base metals explorer, is pleased to announce an Independent JORC-Compliant Exploration Target (the ‘Exploration Target’) for the Soviet-era Rulikha Deposit. The Rulikha Deposit is located primarily on East Star’s 100%-owned tenements in the East Region of Kazakhstan. The estimate contains an upper limit of 23Mt @ 2.4% copper equivalent (CuEq), constrained by an open pit using the processing recoveries and metal prices contained in Table 2 below. Using the upper limit assessment, the deposit has the potential to contain over 550,000 tonnes of copper; nearly double the CuEq metal of the Company’s Verkhuba Copper Deposit.
The town of Rulikha and the district of Shemonaikha have already provided East Star with the required land access approvals to drill, however, further environmental approvals are still required.
Highlights:
Near-surface, high-grade copper
Vein 1 contains very high Cu grades and significant thickness
Mineralisation begins from approximately 30 m depth resulting in a low strip ratio
Multiple payable metals
Contributions from Zn, Ag, Pb and Au improve optionality and potential economics
Excellent infrastructure
Rail (<2km), roads, power lines, existing concentrators within trucking/rail distance
Large mineralised system
Numerous mineralised lenses over a 1.9 km strike
Additional untested anomalies (such as the Rulikha North IP target) provide significant upside beyond current modelling
Water, the local settlement, and moving infrastructure are three hurdles which need to be overcome for permitting drilling and any future mining of this deposit
Table 1: Exploration Target, Upper and Lower Limit
Veins 1-3
Tonnage
Cu (%)
Contained Cu (t)
Au (g/t)
Au (oz)
Zn (%)
Zn (t)
Ag (g/t)
Ag (oz)
Lower Limit
15,000,000
1%
150,000
0.1
48,000
0.80%
120,000
5
2,400,000
Upper Limit
23,000,000
2%
460,000
0.3
222,000
1.50%
345,000
15
11,000,000
Independent Consultant Recommendations to Convert to a Mineral Resource
1. Verification/twin drilling of Vein 1 and upper lens system
2. Infill drilling to confirm continuity and reduce spacing
3. Density measurements
4. Metallurgical sampling
5. Regulatory approvals for water-protection areas
Alex Walker, CEO of East Star Resources, commented:
‘We’re delighted to add a second and significant multi-element advanced exploration target to our portfolio. If converted to a JORC resource, Rulikha could increase our copper inventory by three times, while the economic modelling, based on the limited historic drill data available, provides an early indication of an extremely robust operation. East Star will need to undertake the significant consulting work to advance this project, and we look forward to working with the government and local communities to realise the shared benefits such a development could bring.’
Figure 1: Two Priority Target Areas Requiring Verification Drilling
Figure 2: Samples from Site Containing Copper Oxides and Sulphides Directly Above Target 1
In-situ copper oxide (malachite) at Target 1
In-situ sulphides at Target 1
Table 2: Pit Optimisation Parameters
Value
Unit
Ore Mining Cost
2.00
USD$/t
Waste Mining Cost
2.00
USD$/t
Mining Loss
0.0
%
Mining Dilution
0.0
%
Processing cost (Flotation)
20
USD$/t
Processing recoveries:
Copper
90
wt %
Zinc
70
wt %
Lead
50
wt %
Gold
50
wt %
T&R Cost
4.0
USD$/t
G&A Cost
2.0
USD$/t
Element price:
Copper
9,300
USD$/t
Zinc
2,500
USD$/t
Lead
1,750
USD$/t
Gold
3,000
USD$/oz
Payability
Copper
90
wt %
Zinc
60
wt %
Lead
60
wt %
Gold
50
wt %
Royalties:
Copper
8.6
wt %
Zinc
10.5
wt %
Lead
10.4
wt %
Gold
10.5
wt %
Copper Equivalent (Cu_Eq) Factor:
Copper
1.000
Zinc
0.209
Lead
0.105
Gold
0.580
Ore Density
2.9
t/m3
Waste Density
2.9
t/m3
Final Pit Slopes
40
degrees
Cutoff Grade
0.50
Cu_Eq %
Reference
Nichols, R (2025) Estimation and Reporting of an Exploration Target for the Rulikha Deposit, East Kazakhstan. [Accessed 20 November 2025]. Available at: https://www.eaststarplc.com/presentationsandreports
Contacts:
East Star Resources Plc
Alex Walker, Chief Executive Officer
Tel: +44 (0)20 7390 0234 (via Vigo Consulting)
SI Capital (Corporate Broker)
Nick Emerson
Tel: +44 (0)1483 413 500
Vigo Consulting (Investor Relations)
Ben Simons / Peter Jacob / Anna Stacey
Tel: +44 (0)20 7390 0234
About East Star Resources Plc
East Star Resources is focused on the discovery and development of copper and gold in Kazakhstan. The Company is pursuing multiple exploration strategies including:
Volcanogenic massive sulphide (VMS) exploration, which to date includes a deposit with a maiden JORC MRE of 20.3Mt @ 1.16% copper, 1.54% zinc and 0.27% lead, in an infrastructure-rich region, amenable to a low capex development
Copper porphyry and epithermal gold exploration, with multiple opportunities for Tier 1 deposits and a $25 million+ strategic JV agreement with Endeavour Mining for gold exploration
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www.eaststarplc.com
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The person who arranged for the release of this announcement was Alex Walker, CEO of the Company.
This announcement contains inside information for the purposes of Article 7 of Regulation 2014/596/EU which is part of domestic UK law pursuant to the Market Abuse (Amendment) (EU Exit) Regulations (SI 2019/310) (‘UK MAR’). Upon the publication of this announcement, this inside information (as defined in UK MAR) is now considered to be in the public domain.
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