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  2. 3M - Wikipedia

    en.wikipedia.org/wiki/3M

    Five businessmen founded the Minnesota Mining and Manufacturing Company as a mining venture in Two Harbors, Minnesota, making their first sale on June 13, 1902. [1] The goal was to mine corundum, a crystalline form of aluminium oxide, which failed because the mine's mineral holdings were anorthosite, a feldspar which had no commercial value.

  3. Twin Metals mine - Wikipedia

    en.wikipedia.org/wiki/Twin_Metals_mine

    Twin Metals LLC is seeking approval to create and operate a copper sulfide mine near Ely, Minnesota, on Superior National Forest land. There has been significant opposition to the proposed mine, most notably because of its proximity to the Boundary Waters Canoe Area Wilderness, location within a watershed that drains into the BWCA, and the air, water, light and noise pollution and traffic ...

  4. Iron Range - Wikipedia

    en.wikipedia.org/wiki/Iron_Range

    Hibbing (pop. 16,361) is the largest city by area in the state of Minnesota. It is home to the Hull–Rust–Mahoning Open Pit Iron Mine, one of the world's largest open pit iron mines. Hoyt Lakes (pop. 1,888) is in the eastern Mesabi Range. Erie Mining Company previously mined ore and testing to mine new minerals is ongoing.

  5. Long-delayed Minnesota copper-nickel mining project wins a ...

    www.aol.com/news/long-delayed-minnesota-copper...

    The $1 billion open-pit mine near Babbitt and processing plant near Hoyt Lakes would be Minnesota's first copper-nickel mine. Long-delayed Minnesota copper-nickel mining project wins a round in ...

  6. Mesabi Range - Wikipedia

    en.wikipedia.org/wiki/Mesabi_Range

    The Mesabi Iron Range is a mining district and mountain range in northeastern Minnesota following an elongate trend containing large deposits of iron ore. It is the largest of four major iron ranges in the region collectively known as the Iron Range of Minnesota. First described in 1866, it is the chief iron ore mining district in the United ...

  7. Hull–Rust–Mahoning Open Pit Iron Mine - Wikipedia

    en.wikipedia.org/wiki/Hull–Rust–Mahoning_Open...

    The Hull–Rust–Mahoning Open Pit Iron Mine in Hibbing, Minnesota, United States, is the largest operating open-pit iron mine in Minnesota. The pit stretches more than three miles (5 km) long, two miles (3 km) wide, and 535 feet (163 m) deep. [2]

  8. Lake Vermilion-Soudan Underground Mine State Park - Wikipedia

    en.wikipedia.org/wiki/Lake_Vermilion-Soudan...

    An open pit mine began operation in 1882, and moved to underground mining by 1900 for safety reasons. From 1901 until the end of active mining in 1962, the Soudan Mine was owned by the United States Steel Corporation's Oliver Iron Mining division. By 1912 the mine was at a depth of 1,250 feet (381 m). [4]

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