Retked:
Kukruse põlevkivikaevanduse stolli suue / Adit Portal of Kukruse oil shale mine in Estonia
Retked:
Viru põlevkivikaevanduse aherainepuistang / Spoil of mining waste from Viru oil shale mine in Estonia
Retked:
Sillamäe uraanikaevanduse strekilae varing / Collapse of drift roof in Sillamäe uranium mine in Estonia