Antofagasta reports third-quarter copper output fall but keeps guidance | MyJHB.co.za: Johannesburg in the news: Antofagasta reports third-quarter copper output fall but keeps guidance: JOHANNESBURG (Reuters) – Chilean miner Antofagasta said on Wednesday output had dropped 4.6% in the third quarter compared with the previous three months and was likely to be at the lower … [Read more...] about Antofagasta reports third-quarter copper output fall but keeps guidance | MyJHB.co.za