First Mint 10 troy ounce bars are brand new and cast with. 999+ fine silver mined by First Majestic Silver Corp. They feature the First Mint logo, weight, and purity on the front. 10 oz silver bars are the most popular bullion size in the world, and no investor should miss the opportunity to have 10 oz bars in their collection. Each cast bar is hand poured, struck, and burnished to a high shine by one of our skilled artisans in the USA. As a result, no two bars are the same: each displays unique properties and characteristics such as slight pockets, dimples, and ripples. At First Mint we are proud to continue this classic metallurgy process using silver mined by First Majestic. Weight: 10 troy ounces Purity. Length: 88 mm Width: 40 mm Thickness: 8.8 mm.