My periodic table poster is now available! 1kg copper ingot. 1 kilogram of pure copper, sold for investment purposes by The Cohen Mint, which has many affordable ways to buy precious and non-precious metals. Source: The Cohen Mint Contributor: The Cohen Mint Acquired: 25 April, 2009 Text Updated: 25 April, 2009 Price: Donated Size: 3" Purity: 99.9%