Being hungry for info on a timeline, this is what jumped out at me in this article:

Coutts explained that when looking at the potential timeline for development of the RoF, it will pan out with smaller-scale base metals/PGM operations developing first, followed in about 20 to 30 years’ time by large-scale chromite operations that could in the future potentially benefit from a railway line being built into the emerging mining district.

“The railway line would require a minimum regional output in the order of eight-to ten-million tonnes a year to break even, a volume that the initial projects cannot even come close to justify for another 10 to 15 years,” he said.