Group 11 element
Gold coins:  Gold coins are typically produced as 90% gold (e.g. with pre-1933 US coins), or 22 carat (92%) gold (e.g. current collectible coins and Krugerrands), with copper and silver making up the remaining weight in each case.  Bullion gold coins are being produced with up to 99.999% gold (in the Canadian Gold Maple Leaf series).