Metallurgical assay and the U.S. Mint continue to produce precious metal bullion coins for collectors and investors. The precious metal purity and content of these coins is guaranteed by the respective mint or government, and, therefore, the assay of the raw materials and finished coins is an important quality control. In the UK, the Trial of the Pyx is a ceremonial procedure for ensuring that newly minted coins conform to required standards. Metallurgical assay A metallurgical assay is a compositional analysis of an ore, metal, or alloy. Some assay methods are suitable for raw materials; others are more appropriate for finished goods.
Commemorative coins of the Czech Republic from 2006 to 2010. All have got face value 2 500 Kc. Bridges in the Czech Republic Issued from 2011. Last should be minted in 2015. All have got face value 5 000 Kc. Future releases Commemorative coins of the Czech Republic The Czech National Bank issues 200 / 500 Koruna (Kč) silver commemorative coins and golden commemorative coins of various denominations. The golden coins are issued in thematic sets – Bohemian crown set, Charles IV set, Ten centuries of architecture set, Industrial Heritage Sites set and Bridges in the Czech Republic set. In 2000 the special 2000 Kč silver