The Australian sharemarket declined on Tuesday, weighed down by rising oil prices and disappointing earnings from Samsung. The benchmark ASX 200 fell 27.10 points, or 0.31 percent, closing at 8803.90, while the broader All Ordinaries index dropped 32.30 points, or 0.36 percent, to 9004.70. The Australian dollar also weakened, slipping 0.17 percent to 69.43 US cents.

Seven of the 11 sectors experienced losses, with the mining sector leading the downturn. Major miners were pressured by higher oil prices, which increased operational costs and dampened sentiment. BHP shares declined 1.92 percent to $58.87, Rio Tinto shed 1.77 percent to $168.14, and Fortescue Metals Group slipped 0.76 percent to $18.38.

Brent crude oil prices rose to a one-week high, up 1.2 percent to $72.85 per barrel amid reports of an attack by Iranian forces in the Strait of Hormuz, a crucial oil shipping route. This escalation in geopolitical tensions contributed to volatility in energy markets.

Meanwhile, gold prices retreated, falling 0.8 percent to $4,130 an ounce. This decline adversely affected gold producers on the ASX. Northern Star Resources dropped 5.10 percent to $20.66, Evolution Mining decreased 5.31 percent to $11.94, and Newmont fell 2.43 percent to $137.61, reflecting investor caution amid changing commodity prices.

Conversely, Australia’s major banks performed strongly, providing some support to the market. Commonwealth Bank shares rose 1.24 percent to $166.70, Westpac surged 2.38 percent to $36.13, National Australia Bank gained 1.47 percent to $39.22, and ANZ increased by 1.26 percent to $35.44. The banking sector’s outperformance was partly driven by positive investor sentiment and expectations of stable earnings.

The mixed performance on Tuesday highlighted investor sensitivity to global economic developments, particularly in energy markets, alongside corporate earnings results from key international companies.