geoguy

what the heck? This is gold and mica. You are making a mountain out of a mole hill. Pour them in a glass of WATER and the gold and mica will separate. Odds are the mica silicate plates will float. No need for mercury etc.

I'm not sure what you are trying to do. You have a residue containing gold and mica? Or, to the contrary, is this in a matrix rock such as quarzite? If it's a residue then simply dump the gold and mica into a tall clear glass of water and the gold will sink much quicker....the difference so obvious that you just have to tilt the glass after the gold sinks to separate them. I have to question if you actually have flakes of gold and mica....they will be quite distinct if you look with a hand lens. There couldn't be an element and a mineral easier to separate just by vibrating them on a sheet of paper. No fancy solutions or equipment are necessary. Even blowing on the residue will separate them.