The battery cell maker is working on the first section of the factory, in Skellefteå in the north of Sweden, which will be completed in 2020 and produce eight gigawatt cell capacity per year.
Labour negotiations in the copper mining industry still left to resolve - including Escondida - represent about 2.6 million tonnes out of global copper supply.
The takeover offer, which expires next week, offers great exploration potential because Avanco owns a vast landholding in the copper and iron ore-rich Carajás region, second only to giant Vale.