Author 'Ghislain' (Id 249013 ) : We guess a water mill. What mill referred to as 'The Powder keg' was first a grist mill and then a carman. Finally he produced the gun powder by grinding saltpeter to sulfur. A powder for weapons of war and also of hunting. In 1860, as any magazine of the era who respects himself, he exploded in a majestic fireworks display. Today remain few ruins romantic to melancholic on the banks of the LEZ at Castelnau-le-Lez (entity of Montpellier).