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Claims about the death of the mining boom may be premature, with a new report showing a further increase in resource investment in WA and across the nation.

The Deloitte Access Economics quarterly investment monitor, released today, shows total planned or existing investment grew $6 billion in the September quarter to a record $926 billion.

In WA, total planned or existing investment stands at $281 billion although that includes the now mothballed $6 billion Oakajee project.

But even with Oakajee removed from the figures, total investment in WA grew by almost $12 billion through the September quarter.

Deloitte director David Rumbens said WA's economic future based on the investment figures seemed assured for some time to come.

"Even with few new approvals, resources projects under way will keep construction activity in the West humming along at heightened levels for several years yet," he said.

And an increase in non-resource construction is helping underpin the State economy.

The $2.6 billion Elizabeth Quay project, the $2 billion Fiona Stanley Hospital and the Northbridge Link are providing work for many people not connected to the resources sector.

Nationally, projects under construction grew 3.5 per cent in the quarter to be 34 per cent higher over the year at $428 billion.

There was also a 7.8 per cent increase in the value of projects at the committed stage.

However, in a sign the overall boom will start to ebb, the value of projects under consideration fell by almost 17 per cent to be 30 per cent lower than a year ago.

Mr Rumbens said while the boom had a lot of time to run nationally , especially on the back of Queensland's LNG projects, its peak would probably be reached in mid-2014.

"Australia has enjoyed strong income growth as a result of rising global commodity prices and that price growth sparked an unprecedented surge in mining investment," he said.