"Bullion coins" are coins made from precious metals like gold or silver. They are valuable because the metal they are made of is worth a lot of money. Full definition
The Canadian Gold Maple Leaf is the official gold bullion coin of Canada. (veldtgold.com)
The prices of bullion coins have increased in recent years. (goldsilverworlds.com)
America the beautiful silver bullion coins sell at prevailing silver market prices, plus a moderate premium to cover production and other costs. (fsat.ru)