The holotape can be found in AMS corporate headquarters. It is loaded in the Receptionist terminal, directly in front of where the elevator opens in the building.
Hank Madigan: Had to dodge more robots and turrets than I can count, but I found what we were looking for. Atomic Mining Services were the barons of Ultracite. Had a lab right here in this office. I think they might have found a way to help us out. Even if they didn't know it.
AMS was thinking disposal and containment. I'm thinking weapon. Scorched walk around with chunks of Ultracite stuck in them. We modify some guns to fire depleted Ultracite. See if that makes those assholes melt.