Rio Tinto boss Tom Albanese has stepped down after the global miner announced a multi-billion dollar writedown of its aluminium and coal assets.
Doug Ritchie, who led the acquisition and integration of the Mozambique coal assets in his previous role as Energy chief executive, has also stepped down by mutual agreement with the Rio Tinto board.
The $US14 billion ($A13.30 billion) writedown of Rio's aluminium assets and Mozambique coal assets were announced in the same statement released to the Australian Stock Exchange after the market closed on Thursday.
Mr Albanese has been replaced by the company's Perth-based iron ore executive Sam Walsh.
Mine Life Resources analyst Gavin Wendt said Mr Albanese's departure and the writedown were clearly linked, given that they were announced together.
"It's the chap at the top who has to take responsibility," Mr Wendt said.
"It is connected, otherwise it would be a strange co-incidence to announce them at the same time.
"You'd delay the announcements perhaps, or make the resignation prior to the writedown."
The world's second biggest iron ore producer said Mr Albanese and Mr Ritchie would not receive lump sum payments, short-term performance bonuses for 2012 or 2013 or long-term share awards for 2013.
However, under Rio Tinto's 2009 performance share plan award to Mr Albanese will still receive shares worth around 1.6 million pounds ($A2.44 million) .
Further deterioration in aluminium market conditions in 2012, combined with strong currencies in certain regions and high energy and raw material costs, had a negative impact on the current market values in the aluminium industry.
The development of infrastructure to support the coal assets in Mozambique had been more challenging than Rio Tinto originally anticipated, due to local approvals for barge transport on the Zambezi River.
Rio Tinto expects to book a non-cash impairment charge of $US14 billion ($A13.30 billion) post tax in its 2012 full year results which will be released on February 14.
The company's impairments include approximately $A2.85 billion relating to Rio Tinto Coal Mozambique as well as reductions in the carrying values of Rio Tinto's aluminium assets, including Alcan Pacific Aluminium, which are in the range of $US10 billion to $US11 billion.
Mr Albanese, who has been at Rio Tinto for more than 30 years, said that he had left the business in good shape in many respects, but he fully recognised that accountability for all aspects of the business rests with the chief executive.
Mr Walsh will be relocated to London in his new role and receive a base salary of $A1.9 million.
His total remuneration, including bonuses, will increase 15 per cent to $7.8 million.
Mr Wendt said the Mozambique project was taking much longer than planned and major companies such as Rio were realising the difficulties involved in doing business outside Australia.
"It puts some of this whole political risk talk in Australia in perspective," he said.
Rio Tinto also expects to report a number of smaller asset writedowns in the order of $US500 million.
Chairman Jan du Plessis said the board acknowledged the writedown in relation to the relatively recent Mozambique acquisition was unacceptable.
"We are also deeply disappointed to have to take a further substantial writedown in our aluminium businesses," Mr du Plessis said.
He said Rio's underlying business and balance sheet remain in good health as the company undertook an aggressive cost reduction plan.