What's the noun for ingots? Here's the word you're looking for.
ingot
A solid block of more or less pure metal, often but not necessarily bricklike in shape and trapezoidal in cross-section, the result of pouring out and cooling molten metal, often immediately after smelting from raw ore or alloying from constituents.
“The first form of Sheffield Plate was arrived at by binding, with a brass wire, an ingot of silver to an ingot of copper which was hardened with about 25 percent brass alloy.”