Additional to langstrumpf I want to say that witker zimba has already this job. He has studied in china and he was for training and to assist bringing a plant online at GQD site in China.
I believe it is Frontier's job because they have not decided for their separation plant. The mentioned DFS would support their decision. And I think that GQD has already designed the separation plant in vredendal. They are also responsible for construction and commissioning.
At Vredendal there is no DFS -