Talking about Krong means talking about tailings. I think AURC will be right and concentration will be far above mining average.
The costs will be much lower than in a conventional mine. And 43-101 will proove this. The lower the minig costs the higher AURC-value. 200USD/ounce could mean 2.8Billion value for AURC. It all depends on mining costs and 43-101 will show us.