I'd get exact percentages, but I don't have a miligram scale and I don't want to risk damaging my iPad mini. I noticed this as I saw it being disassembled, and so I created this graph from mental/visual estimations. (It's logic board is held down with freaking ADHESIVES!)
I just find it sort of funny. less than 10% of the mass of my iPad mini is actually electronics... what has this world come to?