Thank God. I was worried this was a "Well, this is certainly *one* way around the multiple-adjacent texture bug" fix.I don't think this was intentional.
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Eh, they all use the old coal texture now. With a mining helmet, they all looked distinctly different. In darker settings, you could still tell the difference based off what primary color you could make out. Iron was red/brown with sharper edges, coal was a mushy black, lead was kind of an indistinct blue, and nitrate was a lumpy white. Oil sands looked a lot like someone had melted the coal texture and added some purple for funsies.Iron ore is just a little hard to see without much light I guess. Maybe the potassium one too. These're the two I've found in my play through for now. It's not that bad and it doesn't really have bad textures, but maybe the lighting which I'm sure you're working hard on to fix is the problem if not a tiny part of it.
Iron ore looks like stone but it's a little shiny so not too hard to see it. The lead is probably the same. Haven't found coal yet. Potassium is like stone and sand mixed but I found it in sand mostly. Maybe the stone is blending well with the ores' textures. This is my opinion. Goodbye. Hope this helps, though I didn't add much to the topic.