It leads from the exit of Temperino Mine to Valle Lanzi. It develops along the line of metal veins and gives the opportunity to observe the main archaeological and mining features of the area, from the accesses of the ancient and medieval mines to the outdoor quarries, the rests of the hauling shafts, and the galleries. The dominating colors are the yellow and red of the abandoned dumping grounds which are semi-concealed by the luxuriant Mediterranean maquis.