St Barbara Limited ('St Barbara' or the 'Company') (ASX: SBM) is pleased to announce that all remaining assay results have now been returned for the resource definition and exploration drilling of the Sorowar - Pigiput Trend portion of the 31 hole, 7,500-metre diamond drill program at the Simberi Operations in Papua New Guinea (PNG).

Managing Director and CEO Andrew Strelein said 'Hole SDH542 included 44 metres at 2.5 g/t Au from just 113 metres including 9 metres at 6.7 g/t Au and is another very encouraging broad intercept in the new mineralisation zone between Sorowar and Pigiput pits, but outside any current Mineral Resource. Hole SDH540 is on the same trend and included 24 metres at 2.0 g/t Au from 200 metres including 8 metres at 4.2 g/t Au.'

'Hole SDH544 has demonstrated a fault appears to have displaced the northern extent of the trend however the southern part of the trend remains open to the southeast and is a priority for testing in FY25.' 'The results for resource definition and exploration holes in Pigibo are expected to be reported later this month.' 'Whilst these drilling results won't be included in the Mineral Resource and Ore Reserve update currently underway, they will be included in subsequent updates.'

The Simberi sulphide resource definition drilling program comprising of 23 holes for 4,587.6 m was completed in April. The program included 15 holes at Sorowar - Pigiput (reported previously) and eight new holes at Pigibo. Separately, the Simberi sulphide exploration drilling program comprising eight holes for 2,900 m is 70% complete. The program includes four holes at Sorowar - Pigiput and four holes at Pigibo, testing for mineralisation down dip outside any current Inferred Resource area. To date, six holes have been completed for 2,043.1 m

Exploration drill holes SDH540, 541, 542 and 544 tested the interpreted northwest trending zone of the new mineralisation zone located between the existing Sorowar and Pigiput ore bodies, but lie outside any current Inferred Resource area and outside the current conceptual sulphide pit design. Significant Sorowar - Pigiput exploration drill hole intercepts include:

In addition, significant assay results are displayed for all fifteen recent Sorowar - Pigiput resource definition drill holes completed in the area. Holes SDH540, 541 and 542 are interpreted to have intersected the down dip extensions of the northwest striking, moderate southwest dipping Sorowar - Pigiput mineralised trend based on the results returned from the exploration drilling. It is interpreted that hole SDH544 failed to intersect the same mineralisation zone as those above, as a result of a northeast striking fault off-setting mineralisation further to the north and within the existing Sorowar Resource boundaries. The newly defined southern portion of Sorowar - Pigiput mineralised trend remains open to the southeast and is to be targeted in the planned FY25 resource definition and exploration drilling program.

This intercept is located outside the current Inferred Resource area and extends approximately 80 m down dip to the southwest and 40 m vertically below the current conceptual sulphide pit design. Mineralisation in these holes is dominantly associated with a monomict andesite shatter breccia which displays angular clast support in a matrix of quartz +/- carbonate. Visual pyrite is estimated between 5 to 10% and is disseminated in the altered clasts and locally within the quartz matrix. Assay results for SDH525, SDH534 and SDH533 were announced previously (refer to ASX releases on 4 March 2024 titled 'New Mineralisation Intersected at Simberi' and on 10 April 2024 titled 'New Sorowar - Pigiput Mineralised Zone'). Assay results for the recent exploration hole SDH542 are announced in this release.

Visual pyrite is estimated between 5 to 10% and is disseminated in the altered clasts and locally within the quartz matrix. Gold grades (in g/t Au) are displayed in yellow text for each metre interval in the photographs showing core from SDH525, SDH534, SDH533 and SDH542. A one metre high-grade intercept of 59.4 g/t Au from 187 m depth is associated with a quartz vein displaying subtle colloform banded textures. A similar style quartz vein is observed in SDH534 returning a one metre intercept of 13.1 g/t Au from 189 m depth.

Contact:

David Cotterell

General Manager Business Development

Investor Relations

Tel: +61 3 8660 1959

Email: info@stbarbara.com.au

Competent Persons Statement

The information in this report that relates to Exploration Results is based on information compiled by Dr Roger Mustard, who is a Member of The Australasian Institute of Mining and Metallurgy. Dr Mustard is a full-time employee of St Barbara and has sufficient experience relevant to the style of mineralisation and type of deposit under consideration and to the activity which he is undertaking to qualify as a Competent Person as defined in the 2012 Edition of the 'Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves'. Dr Mustard consents to the inclusion in the report of the matters based on his information in the form and context in which it appears.

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