Iron mining in the United States produced 48 million metric tons of iron ore in 2019. Iron ore was the third-highest-value metal mined in the United States, after gold and copper. Iron ore was mined from nine active mines and three reclamation operations in Michigan, Minnesota, and Utah.Most of the iron ore was mined in northern Minnesotas Mesabi Range. Magnetite with Hematite. specimen number 3831878. location Hiawatha mine, Stambaugh, Michigan, USA. description Choice lustrous black octahedral crystals of magnetite to 0.6 cm in size across the top of this bladed specular hematite crystal matrix.