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 Manx pound does not cover non-circulating commemorative designs, such as the traditional Christmas 50 pence coins each year and the various crowns. Coins of the Manx pound The official coinage of the Isle of Man are denominated in Manx pounds. From 1971 to 2016, coins of the Isle of Man were minted by Pobjoy Mint Limited.Since 2017, coins of the Isle of Man are minted by the Tower Mint. Due to matching appearance and value of pound sterling coins, these coins often appear in circulation within the United Kingdom. However, they are not legal tender there. Conversely, the Isle of Man "does"