Most of the metal working evidence from Craggan was dated to the Early Medieval period. A second smelting furnace dating to the 8th-10th centuries AD was identified, as well as two metal working refuse pits which contained hammerscale, a byproduct of smithing. Although no evidence remained of the structure it is likely that at least one of the metalworking waste pits contained remains of a cleared-out furnace, indicating there were multiple metalworking craft areas on the site. The lack of structural evidence for this period could be because the settlement at this time was composed of a small group of people with a focus on metalworking for the wider community. It could also be a factor of archaeological survival, if their buildings were primarily turf-built structures (as are many early medieval settlements seen elsewhere in Scotland at this time) they would no longer survive on a site like Craggan.