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Hassel Iron Works (Norwegian: Hassel Jernværk) was a former mining and iron works company located near the village of Skotselv in Øvre Eiker, Buskerud, Norway.
Hassel Iron Works was established in the 17th century and received a royal privilege from King Frederick III of Denmark and Norway in 1649. The mines was in production until 1854, with some operations continuing until the 1870s. Its most important mines were located at Hassel in Modum and Barbu near Arendal. The operation included a smelter with a large blast furnace. A large water wheel was used to drive the blower in the blast furnace. Hassel Iron Works also received ore from neighboring mines at Sveaas and Skredsvik in Modum, at Holtefjell, Dramdal and Såsen in Øvre Eiker and from Solberg and Åserud in Nedre Eiker.