So I looked it up and didn't see much talk about mines, we do have now this gravity mine launcher in Stay on Target, but it falls short (except for deploying mechanic) for creating mines for other uses, like Ion Mines.
Also, Core book adventure has sentry droid with a scanner sweep in medium range (Average Computers, Droid Int 1, No Skill). Not quite a good mine... close but no cigar.
I believe we haven't seen a space explosive yet, anyone has a sketch up?
I would very much like to see something akin to Cracken's Rebel Field Guide's Merr-Sonn Defender Ion Mines.