It has been doubted whether people in peripheral Norwaywere able to master the technique of extracting metal fromsolid rock, prior to the Late Middle Ages, when Germanminers prospected and explored ore deposits. This papersheds light on metallurgists working in the medieval Oldtown of Oslo, their access to local raw materials, andtheir metallurgical expertise and abilities. It is argued thatpeople living in Oslo had access to the rock mineral galena(PbS), and that by AD 1150–1200, at the latest, they hadthe technology to produce lead. It can be contended thatmetallurgical activities took place in two different areas ofthe town. The study also indicates that local lead was incirculation simultaneously as lead from foreign sources,which may have provided new opportunities for actors in thetown. While the lead was used to produce so-called everydayproducts, indications of serial production of spinning whorls,exceeding that of a normal household, could have beenconnected to a specialized industry for shoe production.Furthermore, this paper demonstrates how with crossdisciplinarymethods, new information can be gathered fromold treasures.