The first picture is a mylar capacitor. I don't think it contains any PM so it's worthless in my books.
The CPU looks like a average ceramic. I haven't processed ceramic CPUs yet so I'm not qualified to comment but if I had to guess, gold content would be somewhere around 0.10 to 0.25g a unit. perhaps somebody more qualified would comment.
The fourth picture looks like a boot chip for a network card. Be careful with this, it may have a lithium backup battery embedded inside so with incineration there is a danger of explosion.
The last picture appears to be a MOSFET in military packaging, Gold plated yes, but the BeO on the front suggests Beryllium oxide in the package which would be a hazard to process.
http://en.wikipedia.org/wiki/Beryllium_oxide
Out of all of that stuff I would probably only be interested in the CPUs and pass on the other stuff.