The dominance of construction minerals is not surprising given their importance in the material mix of OECD countries (about 40% of total extraction) and their high weight to volume ratio. In Chile copper ore extraction grew from 70 million tonnes (Mt) in the early 1980s to well over 500 Mt by 2010. In Australia metal ore extraction grew from under 200 Mt to over 600 Mt between 1980 and 2010, with the extraction of iron ore, copper and zinc more than doubling.