Scrap Gold from Computers

Scrap gold from computers can find from parts of CPU Computers and motherboards. In Japan,Eco-System.Co produce gold bars weighing 199.58 - 299.37 KG per month with a value of money earned between U.S. $ 5.9 million - U.S. $ 8.8 Million Dollars from e-waste (computers,mobilephone..etc) recycle. And this list potential value precious metal (gold,silver..etc) can find from Computers :

a.Case= Galvanized Steel
b.Power Supply :  1.    Housing =Galvanized Steel, 2.    PCB=Various Metals in Components: Tantalum, Silver, Tin, Copper, Aluminum, Gold, Palladium, Nickel, Ruthenium, Lead, Silicon 
c.Front Cover= Plastic
d.Motherboard, PCI Card, Floppy Drive, CdRom, Hard Drive, Memory Stick=Various Metals in Components: Tantalum, Silver, Tin, Copper, Aluminum, Gold, Palladium, Nickel, Ruthenium, Beryllium, Platinum, Lead, Silicon
1.Header Pins= Gold, Nickel, Copper
2.Card Fingers=Gold, Nickel, Copper
3.Platters= Cobalt, Platinum, Chromium
4.Card Sockets=Copper, Beryllium, Gold
5.Hard Drive Housing= Aluminum
6.CdRom Drive Housing= Galvanized Steel
7.Floppy Drive Housing=Galvanized Steel    
e.CPU Heat Sink= Aluminum
f. CPU Retainer= Spring Steel
g.Keyboard=Plastic Housing, Neoprene Buttons, Mylar Sheets printed with silver