The Capex to build a plant just to treat the Tailings is prohibitive. The OPEX looks ok. Hence the need for financial assistance/tax concessions etc for anyone looking to treat the tailings.
In the article below it states a cost of $93m to BEGIN the cleanup. I'd imagine seeing some sort of return on that $93m+ would be desirable.If they were to partner with the government to clean up the tailings it could be a win-win for all.
I dont think Clive will do it alone and I doubt the gov would want to partner with Clive.