Macmahon Holdings executive chairman Jim Walker and two other board members have been buying shares in the mining contractor during recent volatile trading.

Rio Tinto could be seeking to shed as many as 800 Western Australian  iron ore workers, according to unions, who have called on the mining giant to clarify its intentions.

Shares in Evolution Mining fell sharply after Newcrest Mining cut its stake in the gold miner from 32.3 per cent to 14.9 per cent.

Beadell Resources will pay a maiden dividend of one cent a share unfranked despite the gold miner unveiling an 88 per cent plunge in full-year profit.

Oil and gas-focused engineering company Clough has largely held on to profit levels despite enduring a fall in revenue of almost 30 per cent.

Rio Tinto will merge its copper and coal divisions into one business as part of a new range of cost-cutting measures announced by the mining giant.

Global mining giant Glencore will reduce coal production in Australia by 15 million tonnes this year in response to weak demand.

Shares in NRW Holdings fell after the mining contractor posted a first-half loss of $120.6 million and gave an unclear full-year outlook.

Teenager Olivia Mead, who grew up in Perth's outer suburbs and unspoilt by her billionaire mining heir father Michael Wright, walked out of the Supreme Court yesterday with the promise of $25 million from his "colossal" estate.

Sandfire Resources has posted a first-half profit of $30.6 million, down 9 per cent on the previous corresponding period despite a 6 per cent jump in revenue to $264.2 million.

Heavy mining equipment company Emeco has narrowed its first-half loss from $179.8 million to $53 million.