Codelco C and Antofagasta PLC suspended operations at two major copper mines in Chile, the world's top producer of the metal, after a powerful earthquake struck off the coast on Wednesday, threatening over 600,000 tonnes of annual capacity. Copper prices on the London Metal Exchange rose to two-month highs in early Asian trading as worries about supply disruptions offset lingering concerns over demand from China, the world's No. 1 consumer, amid copper's longest rout in years.