Fragum,
The jury is still out for conclusive yield data on the black chips, but rumor has it that an average is from zero to 1 gram per pound in general for plactic pack ics. This figure may be a combination of PMs, not exclusively one PM in particular. I haven't performed any yield tests of my own.
I can tell you that the monolithic capacitors on the memory sticks do contain PGMs (mostly palladium) especially those manufactured prior to 1992.
Steve