The Bronze Age miners has no excavating tools other than picks of deer antler and shovels of the shoulder-blades of oxen. Some of the tunnels are so narrow that they must have been worked by small children. Working conditions, with no more light than that from little lamps of animal fat, can hardly be imagined. As veins became exhausted, the tunnels leading to them were filled with waste rock, which is now being painstakingly removed, so that some of the tunnels are now open to visitors.
This is the entrance, on the right, with the exit to the left of it:-
How these early peoples first discovered how to smelt copper from the ore, and to alloy it with tin (which is quite a rare metal) to make bronze; and whether these developments spread out from a central source or were discovered independently in different parts of the world, remains a mystery to archaeologists.