After the discovery of taconite in the late nineteenth century, scientists struggled to find ways to extract iron ore from this sedimentary rock, which contains 25 to 30 percent iron. The process that was eventually developed involves crushing the hard rock into a powder-like consistency. The iron ore is then removed with magnets and turned into pellets.
Frank Wostrel's hardware store, left side of the image, where the first floor exploded during the cyclone, dropping the second level to the ground, 1904. Part of the first floor walls can be seen just to the left of the building.