I get my announcements from etrade or the ASX website and there is no mention that I can see as to whether the announcement is price sensitive or not. see ASX announcements for IGR below
However, if you get your announcements from HotCopper then you get a price sentive proclomation of (yes) or (no).
The hotcopper announcements today said price sensitive (yes) for the first announcement and price sensitive (no)no for the second. see below
A new announcement has been released for IGR Summary: Trading Halt Announcement number: 573099 Release time: 1/3/2012 9:18:00 AM Price sensitive: Yes
then second announcement
A new announcement has been released for IGR Summary: Trading Halt Request Announcement number: 573123 Release time: 1/3/2012 11:38:00 AM Price sensitive: No
I am not sure who made the disparity between the two announcements from hotcopper, perhaps a typo and given that the announcement relates to drill results and that a trading halt has been called, I suggest that the announcement is price sensitive
Angers
IGR Price at posting:
53.5¢ Sentiment: Buy Disclosure: Held