the desert should not have clay soil as it is made of sand at least that is what the intent is. you can't have every resource in every biome. if the did that there would be ZERO incentive to travel to different biomes.
I personally wish one day that they add more raw ore types to the game and strategically place them in separate biomes here is what I was thinking what TFP "could" do now to spread out the raw materials.
Forest Biome: Iron, Nitrate
Snow Biome: Iron, Lead
Desert Biome: Iron, Oil Shale
Burnt Biome: Iron, Coal
Wasteland Biome: Iron, Coal, Oil Shale, lead, Nitrate (but very random and more spread out)
This is for the surface indicators. I'd keep in the fact that if you just dig under ground that you can still encounter random ore chunks. but at least this forces people to go to the different Biomes to gather the ore they need.
this is a long shot but I do hope that they add more depth to the mining and crafting system. like add in things like copper, cobalt, tin, zinc, over time. if not i am happy with what we got. I am all for additions to the game. I love Conan Exiles crafting system as there is just soooooooo much dept to it. I am not asking for 7D2D to go that route but I feel like they have a way more robust crafting system in place. I am confident Joel will take a look at the crafting systems and flush it all out in due time and if not that is what the moding community is for.
over all @MM just an incredible Alpha. Can't wait for what is coming!!
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the art of mining book is the replacement for getting rare gems (silver, gold, diamonds)