Official figures show mining companies are continuing to spend more on expansion, but a pull back is expected over coming months.
Bureau of Statistics capital expenditure figures show businesses across the economy spent 2.8 per cent more on new equipment and buildings in the September quarter than in the previous three month period.
Spending on buildings was up 1 per cent, while spending on equipment and machinery jumped 6.2 per cent.
The mining sector continued to drive the gains, with current spending on buildings up 1.5 per cent and purchases of equipment, plant and machinery up 9.5 per cent.
However, while actual spending is well up on last quarter and last year, future spending plans in the mining sector have been wound back, with the latest estimate for capital expenditure in the resources industry down 8.1 per cent on the previous one.
The mining sector now plans to spend a total of $109 billion on new buildings, plant and equipment in 2012-13.
While the current level of spending is impressive, Citi senior economist Joshua Williamson says the data provides further evidence that the mining investment boom is near its peak.
"On the surface, the plant and equipment should actually give a healthy contribution to GDP but the expectations of future capex [capital expenditure], particularly from mining, looks like it was down a little bit," he told Reuters.
"So that's backing up a peak in the investment cycle, probably in the next 12 months or so, and maybe even the next six months." Manufacturing has also continued to struggle, with spending on new structures and equipment down 9.7 per cent overall in the September quarter.
The manufacturing sector is now planning to spend a total of just over $11 billion on new buildings, plant and equipment in the current financial year.