cast, mint
鑄 centers on shaping metal by pouring it into a mold: casting molten metal to create objects, and by extension minting coins.
鑄 combines 金 (metal) with 壽, which likely contributes the sound and may relate to pouring or shaping. The character expresses casting metal.
The left side is metal 金, and the right side 壽 looks like a complex mold with many parts. Picture molten metal being poured into an elaborate mold to cast a new object.
For チュウ, imagine casting a metal chew toy for a dog: chew -> チュウ, and the metal is poured into a mold shaped like a bone.