[1][2] Hassel Iron Works received a royal privilege from King Frederick III of Denmark and Norway in 1649.
The mines was in production until 1854, when the company was dissolved and its properties auctioned off.
Its most important mines were located at Hassel in Modum and Barbu near Arendal.
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.