Chatchai Yenbamroong sends letter to shareholders accusing board of eroding value in the company.
Building industry warns levy will increase the cost of home building and renovating.
But company's board says it remains committed to $53m acquisition of truck rental company.
Shares jump after company announces it is on verge of closing out protracted sale of lithium plant.
The price of Australia's biggest export, iron ore, has fallen to a fresh post-global financial crisis low overnight.
Shares in Perth-based biotech Phylogica enjoyed a massive spike yesterday.
The Pastoralists and Graziers Association has attacked a decision by the Freedom of Information Commissioner to release sensitive information on the viability of leases covering vast tracts of WA.
The country's best-known transcontinental train services are back in Australian hands, with private equity group Allegro Funds buying the company behind the Indian Pacific, the Ghan and the Overland.
MD Cameron Henry says delivery of maiden project for Chevron will be the start of more work.
One of the world's biggest coal miners, BHP Billiton, is considering importing the fossil fuel through Bunbury Port amid heightened concerns Griffin Coal is struggling to maintain supply to the Worsley alumina plant.