First off, it is a virtual certainty that the LHC cannot create a black hole. Principally due to the lack of mass of the particles that are in play. Mass would not be generated either. The collision of particles is generating smaller material with even less mass. How the doomsayers could believe that it could be possible is beyond me.
I just found this clip from Discovery:
If (and that remains a big "if") the LHC creates a black hole it will be extremely tiny, much smaller than a single atom, said Wilzcek. Its mass will be the same as the two protons that created it. Its range will be small -- only a few times the diameter of the two protons.
According to Wilczek, that's too small for the baby black hole to eat enough particles to grow to any real size. With no food, the black hole will simply wink out of existence in a fraction of a second.
To create a stable black hole, one capable of consuming the Earth, the black hole would have to be several hundred tons. A LHC-generated black hole would weigh a tiny fraction of a gram.
Hope this helps clarify things a bit.