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 Indian rupee new Re symbol. Now it is being minted in all four mints, which are Mumbai, Kolkata, Hyderabad, and Noida. Apart from these definitive coins, 10 rupee bi-metallic commemorative coins have also been released as follows: 2008 – Tri Centenary of Gur-ta-Gaddi 2009 – Homi Bhabha Birth Centenary 2010 – RBI Platinum Jubilee 2012 – 60 Years of Parliament's first sitting. Coins of the Indian rupee Coins of the Indian rupee were first minted in 1950. New coins have been produced annually since then and they make up a valuable aspect of the Indian currency system. Today, circulating coins exist in