Necro, in your example what was the purpose of defining the stone versions of the obsidian ores? They will never exist in that state, only as metal bars (smelted from obsidian) and then refined to usable metals correct?
Talking about these:
-snip-
The purpose of them was because at that time I thought that you wanted random amounts of metal in amounts smaller than 1% for all metals. The obsidian processed to 5 metals which were completely useless on their own, which then processed back to materials that were ores (the stone versions of the obsidian ores). This allowed there to truly be a % chance of a full bar of, say, adamantine in an obsidian as opposed to your method, where you have a %chance of 1/5 of a bar.
It isn't really necessary to have the extra stones if you're going with the (more-refined) slag method, it's just how I initially thought to trigger the ore RNG mechanic more than once per obsidian stone and so manage >1% metal content.
...Actually, I just noticed a problem with this whole thing. Obsidian is now an ore, and so can be used for the various "create alloy from ore" reactions. You should, with your setup that you have in your most recent post, be able to create brass and bronze straight from obsidian, with a 100% success rate, and at a rate of 2 bars per stone. It's for the same reason why tetrahedrite is best used to make billon, in terms of value: the game just checks to see if it has a zinc and copper ore for the brass reaction, and obsidian is a zinc and copper ore and so a single obsidian can fulfill the brass reaction, making 2 brass.
You can get around that problem by making all of the metals form slag bars or wafers and just having some of them produce normal bars on a 1:1 basis, or something similar, but I suspect that any stone with low-percentage ores is going to have unintended consequences no matter what, so it might not be worthwhile to bother. My original method doesn't even dodge the one-stone-to-two-bars problem entirely, though (through sheer luck) only the third-tier ore-stone (iron/silver/gold) can be used on its lonesome (for electrum).