SANTIAGO (Reuters) - Codelco, the world's No.1 copper producer, will seek to reduce 2013 physical copper premiums to Asian buyers by about $5, while its European rate will likely be held or trimmed by a smaller amount, a source linked to the company told Reuters. The possible offer of a roughly $105 premium per tonne for Chinese clients over cash London Metal Exchange copper prices comes as international mining companies fret about a sag in demand from top metals consumer China. ...