One ton of circuit boards contains about 100 times more gold than a ton of ore mined from the ground. Now, scrappers like Wade Crawley in Sydney, Australia, are cashing in. He’s partnered with Mint Innovation, a company that uses microbes to recover precious metals from electronics. In a single day, Mint can salvage up to $85,000 of gold in their new recycling facility. Wade, are you a member here by any chance?
"Miniroo" is located in Melb West suburbs. He also has a youtube site under the name "eWaste Ben". This is one of his posts on scrapping PCs: https://www.silverstackers.com/forums/index.php?threads/top-15-cpus-for-gold-content.90019/