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 Philippine peso denominations. This has been an additional denomination to the current coin circulation and a replacement for the 10-piso NDS banknote. The series used again the Optima typeface. The 1997 and 1998 5 peso coins had no mint marks, but coins issued from 1999 onwards had mint marks. The 1997 and 1998 coins were minted by the Royal Canadian Mint. However, not all 1997 and 1998 coins were minted by the Royal Canadian Mint, quite a few were minted by the Manila Mint. On March 26, 2018, the Bangko Sentral ng Pilipinas introduced the "New Generation Currency Coin Series" which was