The Australian dollar has benefited from weak US jobs growth and an Indonesian ban on mineral ore exports.
At 1700 AEDT on Monday, the Australian dollar was trading at 90.28 US cents, up from 89.03 cents on Friday.
The local currency began the week on a firmer footing after weaker than expected US non-farm payrolls figures - showing 74,000 new positions were created in December against forecasts of 197,000 jobs - dented the greenback.
"To have a woeful number come in below 100,000, it really goes against the trend," Easy Forex senior dealer Francisco Solar said.
The US Federal Reserve diluted its monthly bond buying program from $US85 billion to $US75 billion in December but the weak numbers made traders question if quantitative easing would be tapered again in late January, he added.
"It prompts the market to start questioning whether they'll taper again at the end of this month or whether there's going to be an extended pause ... which could add to some US dollar weakness," he said.
"The Aussie is one of those few currencies that really expresses US dollar weakness quite well."
The Australian dollar hit an intraday high of 90.41 US cents in late afternoon trade after Indonesia's ban on mineral ore exports pushed up gold and nickel prices.
"That helped give a bit of a boost to the Aussie as well," Mr Solar said.