Shanghai copper futures edged up Friday, while London copper edged down.

The most-traded copper contract on the Shanghai Futures Exchange (SHFE), for September delivery, closed at 42,380 yuan ($6,828) per ton Friday, up 190 yuan from Thursday. A total of 225,938 lots changed hands Friday, 7,135 lots more than on the previous trading day.

The September contract rose 450 yuan or 1.07 percent for the week.

The benchmark three-month copper contract on the London Metal Exchange (LME) closed at $5,759.00 a ton Friday, down from $5797.50 a ton Thursday.

Base metal markets were mixed. "Sentiment in the commodity market improved after news that US construction spending in May was the highest since October 2008. Supply-side reaction started to emerge due to low metal prices," according to a research note sent to the Global Times Friday by ANZ Banking Group. "In the coming week the direction of base metal prices are expected to be driven by the referendum outcome in Greece," the note said.

London copper slipped Friday alongside other markets on worries about the fallout from Greece, but losses are likely to be capped by a weaker dollar and expectations that further price falls could lead to production cuts, Reuters reported Friday.

Copper is widely used in power and construction. Copper prices are expected to face pressure in coming weeks due to seasonal downturn in Chinese demand, the Reuters report said. China accounts for about half of global consumption, which is estimated to be about 22 million tons this year. A weaker US currency also makes dollar-denominated commodities such as copper cheaper for holders of other currencies.

"The (US) jobs report yesterday weakened the dollar," Reuters reported Friday, citing Vivienne Lloyd, analyst at Macquarie. And shrinking supplies of high-quality concentrate in the first half of this year are also a potential plus for copper.

Global Times - Reuters