I've about 50 various old CPUs from 8086s through Pentium II Class. I was looking at 'em all and was wondering if all of those gold colored little prongs sticking out of the bottom really were Gold. I was thinking I could clip 'em, melt 'em and make a good sized nugget. Anyone know what the prong metal is composed of? Also, I've several old ISA and PCI cards. What are the metal contacts along the bottom edge made of?