The hinge is riveted and once bust is gone. You'll be able to peel back rubber and shove a new bolt through, but it'll probably loosen off in no time.
I picked up a cheap mirror off eBay a while back, with a loose ish hinge. Week later it fell off and low and behold the rivet had been replaced with a bolt. Got it refunded, didn't even want it back, reckon seller knew full well it was fooked!