London copper came off a touch on Tuesday but remained near four-week highs as the dollar stayed under pressure after Federal Reserve Chair Janet Yellen said a rate hike was on the horizon but did not specify when, Reuters reported. Three-month copper on the London Metal Exchange edged down by 0.2% to $4,679.50 a ton, after closing flat in the previous session when it struck the highest since May 12 at $4,748 a ton. Shanghai Futures Exchange copper had also finished barely moved at 36,060 yuan ($5,496) a ton.
