A summary of trading in key commodities markets overseas:
Oil prices have dived, with Brent crude tumbling about five per cent, after new data showed weakening US and Chinese manufacturing and amid worries about the global supply glut.
US benchmark West Texas Intermediate on Monday plummeted 4.1 per cent for September delivery, shedding $US1.95 to close at $US45.17 ($A61.78) a barrel on the New York Mercantile Exchange.
Brent North Sea crude for September finished at $US49.52 a barrel, down $US2.69 (5.2 per cent) from Friday's settlement on the Intercontinental Exchange in London.
The rout on the oil market extended Friday's more than two per cent losses.
Gold has dropped, after falling by the most in two years in July, as the dollar rose and investors monitored US economic indicators for clues on the timing of a hike in US interest rates.
Spot gold was down 0.9 per cent at $US1,086.06 an ounce by 3.02pm EDT (0502 Tuesday AEST). The metal hit a low of $US1,077 on July 24, its weakest in five-and-a-half years.
US gold for December delivery settled down 0.5 per cent at $US1,089.40 an ounce.
Spot platinum dropped 2.6 per cent to $US955.74 an ounce, after posting the biggest monthly fall in 10 months at 8.7 per cent in July. Palladium lost 2.3 per cent to $US595.25 an ounce, nearing the lowest since October 2012.
Spot silver was down 2.2 per cent at $US14.44 an ounce, near last month's six-year low.
Copper prices hit six-year lows as manufacturing data from top consumer China and a slide in Shanghai equities reinforced concerns about the country's economic growth prospects.
London Metal Exchange three-month copper tumbled 1.7 per cent to $US5,142 a tonne, its lowest level since July 2009. The metal used in power and construction ended at $US5,220, from $US5,230 at Friday's close.
Three-month aluminium earlier touched a six-year low at $US1,601.50 a tonne, a drop of more than 20 per cent since early May. The metal used in transport and packaging ended at $US1,612, down from $US1,618 on Friday.
Zinc fell to $US1,882.50, its lowest since Dec 2013 and ended at $US1,905, from $US1,916. Lead slid to a five-year low at $US1,672 and closed at $US1,700, from $US1,702.
Tin slipped to $US16,005, from $US16,300.
Nickel fell to a one-month low of $US10,660. It ended at $US10,745, from $US11,045 at Friday's close.