yes but not in this case,if Sino did that they'd be in breach of...

yes but not in this case,

if Sino did that they'd be in breach of the disclosure provisions of the Corporations Act as well as the ASX listing rules.

Just look at what happened when Shougang tried to do a similar thing with MGX. They had to dispose of all their holdings which they accumulated without disclosure and firb approval.

I know that Sino already have the firb approval, but they still must disclose any increase in substantial holding once they become a substantial holder ie over 5%.

They're also a Chinese govt controlled entity, so it would be very unlikely that they'd engage in any funny business.