Fahlun, Or Falun (Sw. Fahlu), the capital of the Swedish lan of the same name or Koppar-berg, on the W. shore of Lake Runn, 130 m. N. N. W. of Stockholm; pop. in 1868,5,891. The houses are low and almost entirely of wood. The copper mines W. of this town are among the oldest and most celebrated in Europe. They produced in former times upward of 3,000 tons, but now about 700 tons annually. The external opening, made by the falling in of ancient galleries, is about 300 ft. deep, and 1,200 ft. long by 600 wide. The descent to the bottom of this is by easy stairs, whence steep ladders lead to the pits, the lowest of which are about 1,300 ft. from the surface. The excavations extend many miles under ground, forming several magnificent chambers, where banquets were given to Bernadotte and his queen, and Prince Oscar, on which occasions the mines were brilliantly illuminated. The mines are owned by a company of 1,200 shares, which has the monopoly of iron and other works in the vicinity. Besides copper, small quantities of gold, silver, and lead are obtained from the ore.

Connected with the mines are a school of practical mining, a model room, a large scientific library, and a geological museum. (For the lan see Kopparberg.)