Minnesota, Historical Profile (1919), #005-Mineral Resources
Minnesota is the leading state in the Union in the production of iron ore, and contains what are probably the largest iron mines in the world. These are located in the Mesaba and Vermilion ranges, near the head of Lake Superior. The ore is shipped by rail to Duluth and Two Harbors, and thence it goes by boat to the various points on the Great Lakes, where it is smelted. There are valuable granite quarries at Saint Cloud and Ortonville, on Big Stone Lake. A pink limestone of great value as a building stone is found in Blue Earth and Lesueur counties; a cream-colored limestone is quarried at Red Wing, and a dolomite rock is found near Rochester. A brown sandstone is also found near Sandstone, and in Pipestone County are extensive quarries of red jasper, especially valuable for building and ornament.il purposes. At the foot of this quarry is also found the famous deposit of pipestone used for so many centuries by the Indians in making peace pipes. So far as known, this is the only important deposit of this rock in America. Slate occurs in the northern part of the state, and brick clay is quite generally distributed.