Authorities have also cautioned that a reprieve from dangerous fire conditions could end within days. The warning from the world’s biggest mining company showed how the wildfires have scorched an area one-third the size of Germany.
The damaging bushfires are hugely impacting the world’s no.14 economy.
The nation’s tourism and insurance have also said they face a A$1billion (£53million) blow from the fires.
Thousands of fires were still burning on the country’s east coast on Tuesday despite thunderstorms and rain.
Officials in the region of New South Wales issued a fire danger rating on the state’s south coast.
Furthermore, temperatures are expected to rise in other areas such as parts of Victoria and South Australia on Wednesday.
A spike in temperatures will potentially fan existing wildfires and spark new ones.
Leading officials are to declare “extreme fire danger” in some areas.
The Bureau of Meteorology, Philip Landvogt said: “Not all the fires received the heavy rain over the past few days, so local fire crews will definitely be keeping a close eye on those firefronts.”
READ MORE: Australia: Severe storms and flood warnings hit the region
More than 2,500 homes and 27 million acres of wilderness were also destroyed.
The crisis comes after three years of devastating drought that experts have said is linked to climate change.
The extent of the damage has been experienced in Canberra, Sydney and Melbourne.
All cities have been repeatedly blanketed in thick smoke that has earned them air quality ratings which are amongst the worst in the world.
Early on Tuesday, 86 fires were burning across New South Wales, none above the lowest warning level.
It comes as parts of Australia have experienced what was described by one resident as ‘apocalyptic’ scenes, as huge dust storms swallowed neighbourhoods.
The dust storms engulfed parts of New South Wales such as Dubbo and Orange, sweeping across the sky and shading the sun.
Videos posted on social media captured a dramatic scene, with the rapidly approaching dust storm clouding everything in its wake.
Many social media posts showed cars being abandoned, as people rushed to find shelter amidst the storm.
An area particularly affected by the dust cloud was the rural city of Dubbo.