The price of crude oil on world markets raced higher this week, with London Brent crude breaching 71 dollars a barrel on gasoline (petrol) supply concerns in the United States. Wheat struck an 11-year high in Chicago owing to drought conditions in Ukraine and Russia.
The coffee market was rocked by production woes in key exporter Vietnam, where supplies are struggling to keep up with demand, sending London coffee futures to the highest level since 1998. On the downside gold and silver were hurt by a stronger dollar, while the price of nickel slumped further.
On the London Bullion Market, gold prices dropped to 643.38 dollars an ounce - the lowest point since March 14. The price later recovered, however. The dollar has gained on expectations that the US Federal Reserve could soon increase American borrowing costs.
"Given expectations for higher interest rates to stem inflation concerns it seems gold and the other precious metals will remain under pressure," said James Moore of the specialist website TheBullionDesk.com. On the London Bullion Market, gold dropped to 653.10 dollars an ounce at Friday's late fixing, from 655.25 dollars a week earlier.
Silver is both a precious and industrial metal, used to make jewellery and by the photographic and dentistry sectors. "Strong sentiment in the base metals should continue to lend support to silver," Moore said. On the London Bullion Market, silver slipped to 13.06 dollars an ounce at Friday's late fixing, from 13.31 dollars a week earlier.
Anglo Platinum, the world's biggest platinum producer, offered its workers a seven percent wage increase but this failed to appease union leaders. "The large gap between what the unions are demanding and what is being offered suggests the negotiations will drag on, providing additional support," to prices, Moore said.
On the London Platinum and Palladium Market, platinum retreated to 1,278 dollars an ounce at the late fixing Friday, from 1,288 dollars a week earlier. Palladium eased to 367 dollars an ounce, from 369 dollars.
On the downside nickel, which is used to prevent corrosion, dropped to 38,900 dollars a tonne - the lowest point since February 22. The metal has shed 25 percent of its price since striking a record high of 51,800 dollars a tonne on May 9.
"We anticipate prices to fall further as the market digests a combination of slowing stainless steel activity in the US and Europe, and rising Chinese output of low-nickel pig iron spurred by its spiralling nickel ore imports," Barclays Capital analysts said.
On Friday, the price of copper for delivery in three months rallied to 7,381 dollars a tonne on the London Metal Exchange, from 7,202 dollars a week earlier. Three-month aluminium prices nudged higher to 2,716 dollars a tonne, from 2,709 dollars. Three-month nickel prices slumped to 40,900 dollars a tonne, from 42,600 dollars.
Three-month lead prices increased to 2,353 dollars a tonne, from 2,257 dollars. Three-month zinc prices advanced to 3,685 dollars a tonne, from 3,600 dollars. Three-month tin prices jumped to 14,100 dollars a tonne, from 13,705 dollars.
Gasoline or petrol stockpiles are presently a major influence on the market because of the ongoing US driving season, when demand traditionally peaks as American holidaymakers hit the highways. Prices began in positive territory after a heavy sell-off the previous week, which was partly sparked by fears that rising global interest rates could crimp global economic growth - and energy demand. Crude futures reversed direction on Tuesday as the market turned its focus to the weekly US stockpiles data.
Expectations that gasoline supplies had risen strongly last week led traders to shrug off a forecast of higher crude demand by the International Energy Agency.
However, prices surged higher on Wednesday after the US Department of Energy revealed that American gasoline inventories were, in fact, unchanged at 201.5 million barrels in the week ending June 8, ending a five-week streak of gains.
Crude prices were also supported by a decline in refinery utilisation for the second consecutive week. Elsewhere in the market, the Organisation of Petroleum Exporting Countries held steady its estimate of world demand for oil this year in a monthly report.
The producers' grouping also brushed aside calls from consuming countries that it boost supply in a bid to lower prices. Geopolitical jitters have also lent support to oil prices amid unrest in the crude-rich Middle East, and lingering concerns over Iran's disputed nuclear energy ambitions.
Brent North Sea crude for August delivery surged to 71.84 dollars a barrel on Friday, from 69.78 dollars a barrel a week earlier. New York's main oil futures contract, light sweet crude for delivery in July, advanced to 67.70 dollars a barrel, from 65.08 dollars a barrel.
Wheat for July delivery soared to 6.07 dollars a bushel, from 5.27 dollars. July-dated soyabean meal - used in animal feed - increased to 8.43 dollars, from 8.21 dollars. On the Liffe, London's futures exchange, the price per tonne of wheat for November delivery gained to 112.75 pounds, from 106 pounds.
Coffee prices in London have rocketed as investors fret over lower exports from Vietnam, which is the world's second biggest coffee producer. "Essentially Vietnam is the worry," said Denis Seudieu, chief economist at the London-based International Coffee Organisation (ICO).
"Not only are supplies there struggling to keep up, but the coffee is of a poor quality and many batches have recently been rejected at European ports." The concerns have also buoyed the price of Arabica beans which are mainly grown in Brazil, the world's leading coffee producer.
High-caffeine Robusta, a bitter variety used in instant coffee, and the more expensive Arabica are the two most widely traded types of coffee. By Friday on the Liffe, Robusta quality for July delivery slid to 1,853 dollars a tonne, from 1,874 dollars a week earlier. On the NYBOT, Arabica for July delivery gained to 115.40 US cents a pound, from 114.85 cents.
By Friday on the Liffe, the price per tonne of white sugar for August delivery dropped to 305.60 dollars, from 311.50 dollars a week earlier. On the NYBOT, the price of unrefined sugar for July delivery slipped to 8.53 US cents a pound, from 8.74 cents.
"Although easing again, the market remains above where it was four weeks ago in Australian, US and Euro currency," said the Australian Wool Industry Secretariat. The Australian wool market finished 1.8 percent lower on average from a week earlier, with the Eastern Index ending at 9.85 Australian dollars a kilogramme.