Hard to say if it is up or down for the short term. But int he long run, buying a company at this point is the best thing a cash rich company like YZC can do.
In all likelihood, YZC will have to pay about 50% premium for the company. But it is still way cheaper than what it would be if the merger happened in March! China still relies on coal for 70% of energy production. The technological benefit of an Australia company is also a huge positive for YZC's production efficiency and safety in the future.