GR ENGINEERING SERVICES LIMITED — Capital/Financing Update 2023

Apr 13, 2023

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ASX RELEASE

14 April 2023

For immediate release to the market

West Musgrave Project – Design and Construction works

GR Engineering Services Limited (ASX: GNG) (GR Engineering) is pleased to announce that it has entered into two contracts with OZ Minerals Musgrave Operations Pty Ltd, a wholly owned subsidiary of OZ Minerals Limited (ASX: OZL), for the design and construction works of the West Musgrave Mineral Processing Plant (West Musgrave Project) in Western Australia.

GR Engineering has been engaged by OZ Minerals Musgrave Operations Pty Ltd to provide the following services for the West Musgrave Project:

• Engineering design, drafting, project management and commissioning; and

• Structural, mechanical, piping, electrical and instrumentation construction works.

GR Engineering’s wholly owned subsidiary, Mipac Pty Ltd, will also be engaged within the GR Engineering scope of work to provide specialist electrical and instrumentation services.

The estimated revenue from the delivery of these contracts will be $312 million over a two year period.

Commenting on the contract awards, Mr Tony Patrizi, Managing Director, stated that:

“We are pleased to have been engaged by OZ Minerals to play a key role in the delivery of the worldclass West Musgrave Project. This is an important project for GR Engineering as we have worked with OZ Minerals over many years on projects within the OZ Minerals group, including the West Musgrave Project, and see this award as a strong endorsement of our proven delivery capabilities. We look forward to continue working collaboratively to deliver a safe and successful outcome on the West Musgrave Project.”

Ms Debbie Morrow, Projects Executive for OZ Minerals, commented:

“We’re delighted to be working with GR Engineering on the design and construction of the Minerals Processing Plant for the West Musgrave Project, which is set to be one of the largest, lowest cost, lowest emissions copper nickel projects.”

Ends.

For further information please contact:

Tony Patrizi Managing Director  +61 8 6272 6000  tony.patrizi@gres.com.au

Omesh Motiwalla CFO & Company Secretary  +61 8 6272 6000

 omesh.motiwalla@gres.com.au

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GR ENGINEERING SERVICES LIMITED ABN 12 121 542 738 Tel: +61 8 6272 6000 Fax: +61 8 6272 6001 Email: gres@gres.com.au Website: www.gres.com.au PO Box 258, Belmont WA 6984 71 Daly Street, Ascot WA 6104