At closing bell, the benchmark S&P/ASX200 declined 52.07 points, or 0.7%, to 7,379.29. The broader All Ordinaries decreased 54.41 points, or 0.71%, to 7,649.60.
The country's most populous city of Sydney extended a coronavirus lockdown by another four weeks until August 28 as it fights a flare-up of the virulent Delta coronavirus variant.
Shares of materials and resources declined, with mining heavyweight BHP down 1.7 percent after it trumped a bid by mining magnate Andrew Forrest to buy Canada's Noront Resources. Rio Tinto ended modestly lower after announcing plans to build a lithium mine in Serbia.
Energy stocks were also lower, with gas explorers Woodside Petroleum and Santos falling 2% and 1.4% respectively.
Spark Infrastructure was up 5.4%, after a consortium that includes private equity giant KKR & Co Inc sweetened a buyout deal for the electricity infrastructure investor.
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In economic news, consumer prices in Australia were up 0.8% sequentially in the second quarter of 2021, up from 0.6% in the previous quarter.
CURRENCY NEWS: The Australian dollar changed hands at $0.7343, above levels below $0.732 seen last week.
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