ASX Release/ 3 March 2021

St Barbara appoints Macmahon as underground mining contractor at Gwalia

St Barbara Limited (St Barbara) advises that, following an extensive tender process, Macmahon Holdings Ltd (Macmahon) has been appointed the underground mining contractor at the Gwalia mine at Leonora Operations in Western Australia.

The initial contract term is five years, with an option for St Barbara to extend for a further three-year period.

The appointment of Macmahon brings an opportunity to enhance the performance of the Gwalia mine. The change of underground operator and new contract terms are an important aspect of St Barbara's Building Brilliance company transformation.

St Barbara Managing Director and CEO Craig Jetson said: "St Barbara is delighted to appoint Macmahon as a key partner in our commitment to instill a performance-led-culture at Gwalia."

"This change is indicative of St Barbara's determination to enliven Gwalia's future, to safely and sustainably rebuild operational performance and to secure future investment by delivering predictable and strong financial returns."

"We would like to thank Byrnecut for their service over the past seven years and look forward to an orderly and effective transition. During the handover period management will be focused on the well-being of our people and continuity of operations."

The new contract terms dictate an appropriate risk responsibility between the contractor and St Barbara and is expected to improve underground mining performance and productivity, while reducing operating costs. Worker headcount is expected to remain stable.

St Barbara and Macmahon expect to sign the mining services agreement in March 2021.

Investor Relations Media Relations Authorised by

Mr David Cotterell Mr Ben Wilson Ms Sarah StandishManager Investor Relations GRACosway

+61 3 8660 1959 +61 407 966 083

General Counsel & Company SecretaryASX: SBM ADR: STBMY 3 March 2021

St Barbara Limited ACN 009 165 066

Level 10, 432 St Kilda Road, Melbourne VIC 3004

Locked Bag 9, Collins Street East, Melbourne VIC 8003

T+61 3 8660 1900F+61 3 8660 1999Wwww.stbarbara.com.au

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St. Barbara Limited published this content on 03 March 2021 and is solely responsible for the information contained therein. Distributed by Public, unedited and unaltered, on 03 March 2021 08:23:07 UTC.