LONDON, Oct 11 (Reuters) - Copper producer Atalaya Mining, which is backed by Swiss trading giant Trafigura, is looking for a buyer, two banking sources said on Thursday.The Cyprus-based miner has hired Canadian investment bank Bank of Montreal to help with the sale, the sources said.Atalaya's main copper asset, the Proyecto Riotinto in the Spanish region of Andalucia, was part of a mine complex b...Read More