Yes. Cell phones and many other electronic gadgets use gold because it is a good conductor. It also does not corrode which makes it ideal for contact surfaces like on your PCI card.
Yes all electronics have gold. It is only a thin plating on contact points. To collect one ounce of gold from electronic components, you would need about half a ton of cpus, PCI cards, cellphones, etc. Even the battery contacts and SD slots, along with SD cards are thinly plated in pure gold. What is more abundant in E-waste is palladium. Its worth refining if you have enough E-scrap. Palladium is worth $550.+ per ounce.
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