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[–] CeepsNo [S] 0 points 1 point (+1|-0) ago 

Well, I don't know about ancient gold mines, but for ancient construction I will say this. Ancient people still had good mathematics and engineers. If you were to use a pully and connect a large thing you wanted to lift to a very heavy counterweight, and then dig out underneath the counterweight, guess what? Now the object you're lifting becomes essentially weightless if the weights match, or if the counterweight is heavy, you can lift it easily. Then you can slide boards under the lifted object to create scaffolding. Rinse and repeat.

I just searched for an old video I remember seeing. Quality isn't good. Guy recreates stonehenge using ancient building techniques. https://www.youtube.com/watch?v=oK1Rzch89Dw