I've done this many times by adding steel wool to fixer. After a day or so, the steel wool has partially dissolved and there is silver present as a black suspension or sometimes a "mirror" on the wall of the container. The overall reaction is 2Ag(I) + Fe -> 2Ag(0) + Fe(II). There may also be some Fe(III) present.
Is the black Ag suspension a colloid, so it will eventually settle? or is it a permanent mixture?
After these methods, do I collect the silver and sell it then?