where it produces 99.99% pure gold and then turns it into cast bars, minted bars, and coins. The refinery gets its gold from two sources. Primary: gold from mines that is 90% pure. Secondary ...

The Coinage Act of 1965, signed by President Lyndon Johnson, eliminated 90% silver coins from circulation ... their gold Britannia coins. The 1998 to 2012 editions contained 0.958 pure silver ...