I have always thought about this. How did our ancestors find salt and metal? Did someone just choose a spot to dig and go at it?
In: Planetary Science
many different ways.
first of all many deposits were simply visible from the surface and people were scavenging for stuff all the time so they would find what ever is there.
Beside this people have also been digging up the ground to build foundations for millennia and we also had quarries for millennia as well.
In these quarries they will inevitably find some other minerals or metals as well as coal deposits and they will also learn about similarities between different areas where they find certain stuff.
we know of mines dating back over 43000 years so its kind of a long tradition.
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