Think - Surface Miners - large scale surface ore extractionhttps://www.wirtgen.de/en/news-media/press-releases/article_detail.2561.php
"Conventional mining methods involving drilling and blasting were dominant until recently; since 2007, however, one of the continent’s largest iron ore producers has been banking on the innovative technology offered by the Wirtgen surface miners. The mines operated by Fortescue Metals Group (FMG) are Australia’s first large-scale project that uses surface mining as the main mining method. As many as 43 Wirtgen surface miners have become vital keys to the economically efficient mining of high-quality materials in FMG’s iron ore mines.
Cut costs; improve product quality – the advantages of selective mining" ....