> Mr Palmer's Singaporean company Zeph Investments has served a notice of arbitration on the federal government, with the intention that the matter be heard in Switzerland.

...

The dispute centres on the WA government's 2020 legislation to remove Mr Palmer's ability to extract damages from the state regarding the Balmoral South Iron Ore Project in the Pilbara.

The project had been subject to arbitration for several years, with decisions going against the WA government before the legislation was introduced with retrospective effect.