LOL,Irons!!!!!....patience????...no way.....biochemical processes for PM recovery are pretty close to become operative.They work with algae,fungi or bacteria.Some of them are cyanide generators (i. e. Chromobacterium violaceum,an algae or Chlorella Vulgaris,a bacteria),other microoganisms metabolize the cyanide.Biochemical processes are slower than hydrometallurgical ones.What an alkaly cyanide gold process dissolves in hours,biochemical process disssolves it in days.
Have a nice day
Manuel