Underground Gold Mine Photos And Premium High Res Pictures
Underground mine passage with light. In the tunnel mining industry, hole, dark, rock, geology, corridor, mineral, cave, industrial, coal, cavern, stone. Tunnel in old coal mine, reinforced with wood. Corridor in modern coal mine, tracks and elements of internal infrastructure visible. Tunnel reinforced with wood.Bewetterung_9, Supply of fresh air in the underground mining over different stages, at the top with a horse's furniture operating bellows, translation on a cogwheel and at the bottom via a pedal mechanism moving bellows, woodcut, S. 169, (Liber sextus), Manuel, Hans Rudolf (graveur sur bois), 1556, Georgius Agricola De re metallica libri XII quibus officia, instrumenta, machinae, ac omnia.