Bronze is an alloy of about nine parts copper and one part tin. The Sky Disc is made of a particularly soft bronze with approximately 2.5 per cent tin, thus it could easily be mechanically reworked at a later time.
Scientific analyses revealed that the copper of the Sky Disc came from eastern Alpine deposits on the Mitterberg mountain near Bischofshofen in Austria. The tin, on the other hand, probably came from Cornwall in south-west England.
For the gold of the celestial bodies as well as the two horizon arcs, the River Carnon, which is also located in south-west England, could be proven to be the source.