You won't have to dig very deep to discover the mining history of this area. Check out Guia Gold Mine for some insight into the precious resources that were excavated here.
You'll have no end of sightseeing choices when spending time in Macugnaga. Guia Gold Mine is a good place to kick off here, but there are numerous other worthwhile attractions to discover. Fate Lake, and Cingino Dam are near the inactive mine site and will round out your day nicely.