Australia's share market is set to finish the week with little gains as a mining stock rout drags on.
The S&P/ASX200 fell 89.4 points by midday on Friday, down one per cent, to 8,821.7, as the broader All Ordinaries slipped 88.3 points, or 0.97 per cent, to 9,038.5.
The top-200 is up 0.14 per cent since Monday, after a US-Iran peace deal-fuelled rally buckled in the second half of the week.
BHP led the basic materials sector lower, falling 3.7 per cent after the mining giant flagged a $US2 billion ($A2.9 billion) cost blowout relating to its Canadian Jansen potash project.
"BHP continues to invest in its long-term growth strategy," the miner's Americas chief executive-elect Brandon Craig said.
"Jansen is an important pillar of BHP's strategy and will deliver exposure to a future facing commodity with strong demand fundamentals and portfolio diversification benefits."
