There are three mines on North Stradbroke Island, all owned by Sibelco Australia Limited (formerly called Unimin Australia Limited), a Belgian owned multi-national company:-
1. Enterprise, also known as ’Devastation South’ which would run out of minerals by 2027 (at the latest) anyway, even if allowed to continue longer (see official information under ‘library/resources’ tab).
2. Yarraman (Devastation North) which runs out of minerals in 2013.
Mining at the Enterprise and Yarraman mines is for mineral sands: zircon, rutile and ilmenite. The main mining method is dredge mining, with some dry mining. These two mines employ about 100 people, only half of whom live on the island.
3. The third mine, Vance, a silica sand mine (Devastation West) employs only 13 people.
Link to a film produced by Sibelco on their own mining work on the island of Minjerribah (North Stradbroke Island)... https://vimeo.com/channels/qmtv/45246337