If processed into natural gas, the estimated rate of 950kg/h of methane emissions from trona mines in Wyoming could supply electricity for a year to 1 million homes.

The buyer is a partnership between Petra itself and the South African subsidiary of Stargems Group, which will cut and polish the stones locally.

Project will extend the productive life of the aging operation by 47 years and increase copper output by almost 50%.

New research shows that some diamonds are made up of former living organisms that have been recycled more than 400 kilometres below the surface.

They will jointly study the feasibility of a hydrogen pilot plant at Rio’s alumina refinery in Gladstone, Queensland.

The Richards Bay Minerals project was shut down in late June following the murder of the top manager.