Game Design Question ERC1155

Hi there. First time caller. Hoping to get some advice.

Our game has gold!

A. Coins that are fungible but have unique sides from when /where they were struck/minted. Like a US quarter. Front is the same but the back is different for each US state. Some are true one of a kind NFT types.

B. Mining raw gold which is never a whole number. "You mined 22.22222 g!"

We think that EIP 1155 may, may be the right approach here.

On A. the coins are essentially fungible. Each coin just has one bit of metadata (url to an image) that might be unique just to that coin. (like a California backed quarter).

Thoughts on the right approach. Again my role is game design. TY!!!!