[pierrem15]

Google Las Medulas: the Romans basically levelled most of a small mountain range in Spain with hydraulic mining to get the gold out.

[SunkenCiv]

thx

https://www.verdantexperiences.com/en/las-medulas-the-biggest-gold-mine-of-the-roman-empire/

https://californiacurated.com/2023/06/07/the-unearthed-truth-hydraulic-minings-lingering-legacy-in-california/

https://www.imdb.com/title/tt0089767/