Hasselverket When the glassworks at Nøstetangen started up in 1741, Hasselverket was already a well-established company, more than a hundred years old and a renowned ironworks. It produced both wrought iron, which the blacksmiths used as raw material for their products, and many types of cast iron products. Most famous – both at the time and afterwards – was Hassel for its “iron tile stoves”, with iron plates that were small works of art. They were cast in wooden molds with carvings made by some of the leading woodcarvers in the country. The Rococo period in the latter half of the 18th century is considered a golden age for this stove art, and the Rococo stoves from Hassel are an interesting parallel to the glass art from Nøstetangen in the same period. The motifs were taken from biblical history, but also from Greek and Roman mythology. The country’s kings were also paid homage, and some of the wealthiest citizens could also specially order stoves with their own monogram. The owners during this period were the Neumann family, relatives of Cappelen at Fossesholm and members of the local merchant patriciate. Jacob Hansen Neumann was the owner from 1746 until his death in 1777. His widow then took over. The plant's main mines were located in Hasselåsen at Modum, but it also had mines elsewhere on Eiker and not least at Arendal, where iron ore of a very special quality was extracted, which was transported by sea to Eiker. The plant itself with the large blast furnace was located at Daler at Eiker and was powered by water power from the Bingselva River. Together with the sawmills, which were located a little further down the river, it laid the foundation for the settlement of Skotselv

Eidsfos Ironworks

Eidsfos ironworks was started in 1697 by Caspar Herman von Hausmann – grandfather of Caspar Herman von Storm, who played such a central role at the Nøstetangen glassworks. The ironworks was located in Hof parish in Jarlsberg county, but it was still connected to Eiker in several ways. Many of the works' mines were located in the area between Drammensdalen and Eikeren – most at Konnerud, but also partly at Eiker. The farmers at Eiker were probably involved in ore hauling for the works and in deliveries of coal and wood. Together with Kongsberg Sølvverk and Hassel ironworks, Eidsfos was a competitor for Nøstetangen in the fight for forest resources.

Much of the transport to and from Eidsfos also went through Eiker. Ore and other goods for the plant were rowed up the Drammenselva and Vestfosselva rivers to Vestfossen and onward by sailing yacht across Fiskumvannet and Eikeren. Together with the timber rafting and the transport of goods for the Silver Plant, the transport to Hassel and Eidsfos made the waterway at Eiker an important transport artery. It helped to employ a growing population of farmhands and workers.