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 of the Ukrainian hryvnia Coins of the Ukrainian hryvnia were first minted in 1992. Coins were first struck in 1992 for the new currency but were not introduced until September 1996. Initially coins valued between 1 and 50 kopecks were issued. In March 1997, 1 hryvnia coins were added; they are however rarely seen in circulation. The note of the same value is far more commonly used. Since 2004 several commemorative 1 hryvnia coins have been struck. New coins have been produced annually since then and they make up a valuable aspect of the Ukrainian currency system. Today, circulating