I have found lots of information on ancient smelting and forging of metal, but precious little on how these ancient people actually found the metal to work with. Most information points to meteor iron and bog/swamp iron, which yielded very small amounts. How did they (or did they even) prospect for iron veins in the earth, well before the invention of things like metal detectors.
In: Technology
Iron ore is very easy to find on the surface. This is because of its distinct red colour. Just look for a red rock and you have found your iron ore mine. Alternatively look for red water as this water most likely have flowed through an iron ore vein.
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