Blaafarveværket, or the Blue Colour Works, was a mining and industrial company located at Åmot in Modum in Buskerud, Norway, which existed from 1776 to 1898, and which was Norway's largest mining company in the first half of the 19th century. The works mined cobalt ore and manufactured by smelting blue cobalt glass (smalt) and cobalt blue pigment. It is currently a large open-air industrial museum and an art gallery; it is the largest and best preserved mine museum in Europe, and one of Norway's most visited attractions.