I have this idea for a recipe for the Minium stone - One iron ingot could be turned into one copper ingot and one copper ingot could be turned into one tin ingot and one tin ingot could be turned into one iron ingot.

That's a really smart idea,

@AartBluestoke: 👍 Excellent idea, now if only it's possible and pahimar can implement it...

The base idea has some flaws. Different mods that have their own copper and tin have different spawn rates in the world. As for world gen rarity, that is likely to be incredibly expensive. From my brief perusing of the world gen code there are no quick lookup values that you can get the spawn rate of ores. A method is called with a coordinate in it and if the mod wants to spawn an ore there they can or in that area if they want. You could do a statistical average of the world but that would take a huge amount of time.

1 copper/tin = 1 iron? Too OP even for me.

Why is that? As far as I know copper and tin have the same rarity as iron,

would it be possible to link into the worldgen calculations and extract the ore rarity, so that the relative value of the ores changes when generation scarcity changes? -- that would also allow a good guess for the value of mod items as well; the scarcity of their worldgen + how its combined into their mod-items.

Oh also what happens when you have multiple mods that both have copper and tin spawn (yes its stupid because you have two types of copper and tin) but you would have copper and tin be worth nothing because of how common it is.

A method to handle this is already planned, and handles cycles.