Pour fixer down the drain, perish the thought.
I guess I'm going to hell. I use 12-0-0 liquid fertilizer for fixer, desilver it after use & use it at the farm.
FWIW 12-0-0 is liquid ammonium thiosulfate, primarily a sod/turf fertilizer.
Very rich greens with C41 ;)
Thanks for all the info people. And yes, I'd LOVE to grab some silver out of the fixer... this is the first time I've heard of the possibility!!
Will probably give a call to the local authorities soon.
I'm glad this question has come up and for the feedback.