The iron ore price was 1.3 per cent higher at US$136 a tonne during the period.
While coal's shipments are also higher, that is not expected to be enough to offset a price that continued to fall during the quarter while costs remain high.
Thermal Coal shipments are tipped to have risen 3.1 per cent to 50.1 million tonnes on the back of a strong performance at the port of Newcastle.
Revenue is tipped to have fallen half a per cent to US$4.02 billion.
Metallurgical coal exports are expected to have trended 3.3 per cent higher to 44.1 million tonnes.
However, a 3.4 per cent lower average price of US$140 a tonne is tipped to cause revenue to fall 1.6 per cent to US$6.1 billion.
Less than five years ago, coal was Australia's biggest export earner ahead of iron ore but faces strong global competition and has been hit by mass job losses.
East & Partners' senior markets analyst Martin Smith viewed the latest forecasts as good news for both the iron ore and coal industries.
The two industries had shifted from greater capital expenditure in capacity and efficiency improve-ments to outright production.
"The majority of industry analysts expected growing iron ore stockpiles and declining Chinese economic growth to drag on iron ore prices, however this has not eventuated," Smith said.
- AAP