RE: CLaSSic pump and DUMPS Classic pumps don't usually pop this hard...
Just about every junior stock that pops hard on news drifts back - or tanks hard - after the initial runup; so a prudent trader should be out of this now, and those who paid up today and held might be in for a rough ride...
Vein systems are tricky to assess because, as has been said here by another poster today, the tendency is for almost all of the gold to be in the veins and very little in the host rock, so when they annouce a very long interecept with a good grade, it's hard to tell how much barren rock there is between the higher grades, and then to try and figure out what it all means in three dimensions.
Somebody mentioned Hemlo; what they announced today is results from veins, and Hemlo wasn't that type of deposit. Hemlo is more analogous to the Elinore discovery of Virginia Mines a few years ago, or Aurelian's spectacular discovery in Ecuador.
Low grade but continuous in three dimensions can be very popular with investors though; for example, Osisko's Malartic, or Trelawney's Cote Lake. A junior that I like and hold a lot of, and maybe has something similar, is MZO - they've announced long intercepts of lower grade material but so far the market hasn't caught on so it might be worth a look here.