Sales of American Gold Buffalo Coins Shoot Higher. U.S. Mint Sells 18,500 24K one ounce gold coins in May. The U.S. Mint sold 18,500 one ounce American Gold Buffalo coins in May, up 95% from 9,500 sold in May 2015. Sales of American Gold Buffalo coins were down 5% from 19,500 sold in April 2016. … Read More →