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.
Coins of the Ukrainian hryvnia coins exist in denominations of 1 kopiyka (i.e. or ₴0.01), 2, 5, 10, 25, 50 kopiyok, ₴1.00 and ₴2.00. Also minted are bullion (including gold, silver and platinum) and commemorative coins. All of these are produced by the National Bank of Ukraine. In October 2012 the National Bank of Ukraine announced that it is examining the possibility of withdrawing the 1 and 2 kopeck-coins from circulation.[5] The coins had become too expensive to produce compared to their nominal value. Also, on 26 October 2012, the National Bank of Ukraine announced it is considering the introduction of a 2 Hryvnia coin.