Macmahon Holdings Board

Jim Walker

Jim Walker GAICD, FAIM

Non-Executive Chairman – Mr Walker joined the Board as a Non-executive Director in October 2013 and was appointed Chairman in March 2014. From January 2015 until July 2015 Mr Walker assumed the role of Executive Chairman while the Board sought a replacement Chief Executive Officer.

Mr Walker has over 40 years of experience in the resources sector, most recently as Managing Director and Chief Executive Officer of WesTrac Pty Ltd, where he led the company’s rapid development in industrial and mining services locally and in China. Prior to this, Mr Walker held various roles with other Australian Caterpillar dealers.

Jim is a graduate member of the Australian Institute of Company Directors (AICD) and Australian Institute of Management (AIM WA), holding the position of President WA (2008 - 2010) and National President - Australia (2010 - 2013).

Mr Walker is currently the Chairman of the State Training Board (appointed a member on January 2014), Wesley College WA and Austin Engineering and Deputy Chairman of both Seeing Machines (appointed May 2017) and RACWA Holdings Pty Ltd (appointed April 2018).

Mr Walker is also the Trustee of WA Motor Museum and a Non-executive Director of Australian Potash Limited.

Mr Walker was a Director of Seven Group Holdings Ltd and National Hire Group Limited, and was formerly National President of the Australian Institute of Management.

Mr Walker is currently a member of the Board’s Remuneration & Nomination Committee.

Eve Skira


Independent Non-Executive Director – Eva Skira joined the Board as a Non-executive Director in September 2011. Ms Skira has a background in banking, capital markets, stockbroking and financial markets, previously holding executive positions at Commonwealth Bank in the Corporate Banking/Capital Markets divisions and later with stockbroker Barclays de Zoete Wedd. She has served on a number of boards in business, government and the not-for-profit sectors across a range of industries.

Ms Skira is currently the Chairman of the Trustees of St John of God Health Care Inc and a Non-executive Director for The WA Parks Foundation, The Western Australian Cricket Association (WACA) and Western Power.  As a Director, Ms Skira has chaired a number of Audit, Compliance and Risk Committees.

Ms Skira completed her BA (1st Class Honours, Economic History) at the University of New South Wales, and obtained her Masters of Business Administration (Dux and Distinction) at the International Management Institute (University of Geneva), now called IMD International in Switzerland, one of the premier business schools in Europe.

Ms Skira is currently the Chair of the Board's Audit & Risk Committee and a member of the Remuneration & Nomination Committee.

MACM 17950 Headshot Kim Horne

Kim Allan Horne AM

Non-Executive Director – Mr Horne joined the Board as a Non-executive Director in March 2018. Mr Horne has close to 45 years' experience as a senior executive in the mining industry working for Alcoa in Australia and overseas.

During Mr Horne's career, he has also held non-executive roles for industry groups, not-for-profit and government organisations. Mr Horne is a graduate of the University of Western Australia's management education program and was appointed Member of the Order of Australia in January 2014 for his services to the mining industry.

Mr Horne is currently the Deputy Chair of Synergy, WA's largest electricity generator and gas retailer and a Non-executive Director for the Fremantle Port Authority and private entity Rainbow Bee Eater, a renewable energy business.

Alex Ramlie

Alex Ramlie

Non-Executive Director – Mr Ramlie is a Director of AMNT. Prior to joining AMNT, Alex was the President Director and Chief Executive Officer of PT Borneo Lumbung Energi & Metal Tbk which operates a hard coking coal mine in Tuhup, Central Kalimantan.

Between 2012 and 2015, Alex was also a Director of Bumi PLC, a Vice-President Commissioner/ Vice-Chairman of PT Berau Coal Energy Tbk and its subsidiary, PT Berau Coal, and held Commissioner positions in PT Bumi Resources Tbk, PT Kaltim Prima Coal, and PT Arutmin Indonesia.

Before entering the mining industry in 2011, Alex was a private equity professional and was Managing Director of Ancora Capital Management Pte. Ltd., an Indonesia focused private equity fund.

Arief Sidarto

Arief Sidarto

Non-Executive Director – Mr Sidarto is the Chief Financial Officer of AMNT. His qualifications include an MBA from Harvard Business School and two bachelor degrees with summa cum laude from The Wharton School of Finance and The Engineering School of the University of Pennsylvania.

Prior to joining AMNT in April 2017, Mr Sidarto held the position of Managing Director and Member of the Board of PT Rajawali Corporation. He was also Managing Partner of Samuel Group from 2009 to 2015 and Managing Director of Wellspring Capital Partners from 2010 to 2014.

Mr Sidarto was previously with Goldman Sachs New York in 1991 in its Structured Finance Division; before relocating to Hong Kong and then Singapore to run investment banking and corporate finance as Chief Operating Officer.

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