The only cost figures released were contained in a report...

The only cost figures released were contained in a report released many years ago which put production costs around $65/t. Most Yilgarn companies are in the $70/t range, i think $50/t is very optimistic and they would likely be producing already if this were the case. It is hard to compare with other companies when there aren't even a basic scoping study or feasibility study available on the project.