A sheet of sterling silver was heat-fused onto the top of a thick copper ingot. They also exported silver in ingot form. In 2009, Iran exported 77,000 tonnes of zinc and lead concentrate and ingot. Deville was able to produce an ingot of the metal. A boule is a single crystal ingot produced by synthetic means. An ingot from Castle Dore is probably of Iron Age date. A possible official stamp has been identified on the Carnington tin ingot. The first steel ingot was rolled on 16 February 1912. The first steel ingot was manufactured on 16 February 1912. The ingot may also be cast in a mold. The melted ingot is allowed to solidify under vacuum. The impurities concentrate in the melt, and are moved to one end of the ingot. At Saltersford a Bronze Age ingot and a rapier were found. Aunt Augusta's contraband gold ingot, aunt and nephew are deported from Turkey back to England. Notably, recent research found that the iron ingot had no effect on anemia.