Seriously how the fuck do they know where the good stuff is going to be, especially back before ground penetrating radar?
In: Other
Often times those deep mines would be a case of “follow the vein”. A “vein” is like a streak or sheet of one type of rock that cuts through another type of rock. For example, gold is often found in quartz veins. These are visible from the surface, and the mine shaft would be dug to follow its path. Once the vein ended in a particular direction the digging would stop.
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