I was running some silver solder as the anode rod experiment with KNO3 in water. I noticed that the copper silver alloy dissolved but did not evolve gas at the anode. The silver migrated over to the cathode and appeared to be reduced to silver powder by the KOH produced at the cathode, there was a gas from the cathode which I belive was hydrogen but I did not test to see. the copper stayed in solution and everthing went fine until the silver powder worked it was over to the cathode then the process slowed/stopped, I ended the experiment at that time and thaught this would work as a split cell with a piece of filter paper for the salt bridge.
Edit - I also thaught of using a split cell with copper sulfate to recover the gold from electronic scrap, I would just melt the gold containing metals or inquart with copper to make an anode and put in the split cell, the base metals would be able to bridge the salt bridge but the gold would just settle in the bottom of the cell, the only acid would be a little sulfuric in the cells.