The Council of the Authority began work, in August 2002, on another set of regulations, covering polymetallic sulfides and cobalt-rich ferromanganese crusts, which are rich sources of such minerals as copper, iron, zinc, silver and gold, as well as cobalt. The sulphides are found around volcanic hot springs, especially in the western Pacific Ocean, while the crusts occur on oceanic ridges and elsewhere at several locations around the world. The Council decided in 2006 to prepare separate sets of regulations for sulphides and for crusts, with priority given to sulphides. It devoted most of its sessions in 2007 and 2008 to this task, but several issues remained unresolved. Chief among these were the definition and configuration of the area to be allocated to contractors for exploration, the fees to be paid to the Authority and the question of how to deal with any overlapping claims that might arise. Meanwhile, the Legal and Technical Commission reported progress on ferromanganese crusts.