It's a lot of things
Mac from Jesus Lizard is one of my faves (see the post about "worlds greatest drummer" and you'll find him on my list). The sound on Goat is a combination of a few factors: a STEEL 6.5x14 Ludwig Supraphonic snare, the dead center snare wallop of Mac McNeilly, and the pure, essene wizardry of Steve Albini. I've recorded with Albini on a number of occasions, and
I know for certain that he uses little, if anything, in the signal chain. So, gates? Probably not. Having gone into his control room to listen to pre-session scratch drum tracks I 'd just finished playing, I can attest to the fact that he gets those sounds by using the room to its fullest advantage – they're there on the tape BEFORE he starts mixing and adding outboard trickery. If you're talking about the song "Monkey Trick" on that LP – that might be an exception. That snare sounds effected, definitely. What it is, I don't know.