Foundry Crucibles Melting Casting Gold Silver Copper Designed to hold Foundry Crucible tightly. Used in the process such as Melting, Pouring, Casting & Refining of Precious Metals. Designed to hold Crucibles tightly. Used in the process such as Melting, Pouring, Casting & Refining of Precious Metals. Most common item used in Foundries, Casting Plants & Refining Plants for all types of metals.