(heading) Chemical elements or alloys, and the mines where their ores come from.
User Defined Definitions
"any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc."
"a mixture containing two or more metallic elements or metallic and nonmetallic elements usually fused together or dissolving into each other when molten"
"cover with metal"
"containing or made of or resembling or characteristic of a metal"