However if you are investing, rather than trading announcements, remember this will be the first drilling of many. EXM have 15,000 sm of tenenments in Tanami and cash/rigs to drill it!
This is why EXM is such a good tradeable/investable stock, short term the first set of results from Tennant Creek will be the focus, if they are good EXM will run, but as Bushman has highlighted this is only the first 3000m of 15000m, so its not just a one off announcement it is likely to be around 5 over the course of two months.
The number of market sensitive announcements will keep EXM in investors/traders minds meaning volume won't die for too long.
It's hard not to focus on the first set of results, but if these are good it may set EXM alight much like companies such as RMS,KAL,PRE etc (remember its important to assess your own risk/reward profiles before investing in companies like EXM because they usually go very well or very ordinary there is usually no in between)