Sedgman/Hochtief and their subsidiaries are probably used to...

Sedgman/Hochtief and their subsidiaries are probably used to doing business with governments and larger resource companies such as BHP and Rio (who probably roll over and accept cost blowouts because its "someone-else's money" i.e. lower standards of accountability).

They may be in for a rude surprise thinking HRR is just another "easy mark" being a mining company (apparently the perception is mining companies have endless supplies of cash), as long as the fixed price contract is all legit and watertight then HRR have nothing to worry about.