Copper prices edged up on Friday and were on track for weekly gains, but doubts on whether the US-Iran ceasefire would hold tempered the initial optimism on global growth, keeping a lid on metal prices. The benchmark three-month copper on the London Metal Exchange rose 0.29% to $12,718.50 a metric ton as of 0312 GMT, and is set to end the week up near 3%. The most-active copper contract on the Shanghai Futures Exchange added 0.50% to 98,370 yuan ($14,401.79) a ton, poised to post a near 2% weekly gain.The Shanghai copper hit an over three-week high at 98,550 yuan a ton earlier this session. The London copper hit a ... (full story)