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Ever since the big mining change, any time that I mine in Cove Fel, whatever the vein distribution is when I mine the first run is what it stays for that day. Sometimes a few veins will remain the same in following days, but usually, it changes basically from day to day, not spawn to spawn.
As a contrast, Covetous mountain in Trammel where my cabin is located seems to change more often, generally a vein or two every spawn or so.
It's odd.