Ore veins are a geological formation characterized by a local accumulation of mineral or metals. Fictional ore veins are often places where ores like copper, iron, or gold can be found and mined. They are often locations important in game worlds as a place to obtain crafting components or resources central to a fictional game economy. Fictional ore veins may even be a rich source of a fictional material and ores that hum, explode, or exhibit other unusual characteristics are often present in fictional worlds. Ores that glow are particularly common as they can be used to help solve the problem of dark places. Fictional ore veins are frequently found in the mountains and mines of fictional worlds. While the locations of natural ore deposits are governed by geological processes, fictional ore veins be subject to different natural laws. As such they may follow ley lines, be the giant skeletons of gods or fictional creatures, or been established through some other fantastic means.