But probably not in the way you're thinking of it
What would happen is that the speeds that the two gold ions would slam into each other at should be just enough force to overcome the electromagnetic forces (plus any other forces at that level). Once the two nuclei smash into each other, their constitute parts (quarks and such) could get close enough to each other that they cause the atom to fall under the pressure of its own gravity.
It would create a micro-singularity.
But micro-singularities exist for micro-amounts of time. Hawking radiation would cause the black hole to dissipate at almost the precise instant it was created. Not only does that reduce the chance of the black hole "swallowing" up any other particles, but the black hole would also have an electric charge, repelling other atoms away from it. Overall, its charge would actually still keep everything pushed away from it and beyond its event horizon.
So the fear of a micro-black hole being created, then falling to the center of the earth where it quickly grows and destroys everything, is a totally unlikely (hehe, probabilities are fun things) event. I mean unlikely in the kind of unlikeliness that your hand will fall through your desk because all the atoms align just right (which, theoretically, could happen - but is totally unlikely to happen).
