Ruina montium

The landscape of Las Médulas is a result of ruina montium.

Ruina montium (Latin, "wrecking of mountains") was an ancient Roman mining technique that draws on the principle of Pascal's barrel.[1] Miners would excavate narrow cavities down into a mountain, whereby filling the cavities with water would cause pressures large enough to fragment thick rock walls.[2][3][4] It was described by Pliny the Elder (Natural History 33.21), who served as procurator in Spain.[5]


  1. Ancient Engineers' Inventions: Precursors of the Present (Springer, 2009), p. 135.
  2. Rossi, Cesare; Russo, Flavio; Russo, Russo (2009). Ancient Engineers' Inventions. 8. Springer. pp. 133–141. ISBN 978-90-481-2252-3.
  3. Cesare Rossi; Flavio Russo (26 August 2016). Ancient Engineers' Inventions: Precursors of the Present. Springer. pp. 185–192. ISBN 978-3-319-44476-5.
  4. Alfred Michael Hirt (25 March 2010). Imperial Mines and Quarries in the Roman World: Organizational Aspects 27 BC-AD 235. OUP Oxford. pp. 32–45. ISBN 978-0-19-957287-8.
  5. John F. Healy (1999). Pliny the Elder on Science and Technology. Oxford University Press. pp. 275–290. ISBN 978-0-19-814687-2.

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