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• 1 2016-04-23T13:29:12-07:00 The Reserve Mining Company 74 image_header 274970 2016-05-03T11:15:09-07:00 The Reserve Mining Company operated out of Babbitt and Silver Bay, Minnesota from 1955-1980. Reserve began disposing of taconite tailings from their processing plant into Lake Superior in 1955. Over 500,000 gallons of Lake Superior water was utilized every minute for the disposal of these tailings.¹ Overall, Reserve disposed of 67,000 tons of taconite tailings each day, which is approximately 547,500,000 tons of tailings disposed of in Lake Superior in the 25 years of Reserve’s operation and 4,562,500,000,000 gallons of waste-water. Both the environment and the health of the Northshore populace was (and still is) affected by the taconite waste (Duluth, Beaver Bay, Two Harbors, Superior).

  
  
  History of Taconite Mining

  In the 1860s, iron deposits in Minnesota were discovered and mapped. The Biwabik Iron Formation in northern Minnesota is 120 miles long and 250-700 feet thick. The targeted ore in Minnesota’s Mesabi range was high-grade hematite, or “natural ore” (rocks with 50% more iron). Lower grade taconite (25-30% iron) is part of an iron formation that has not been oxidized and enriched by natural processes. These are the rocks surrounding and below the pockets of high-grade ore. Natural ore could be taken from these deposits and directly shipped across the Great Lakes and eventually to steel mills in the eastern United States. More that 85% of U.S. iron ore used in World War II was derived from open-pit hematite mines in the Lake Superior region. In time, however, this high-grade ore became less abundant. Around the end of the Vietnam War, companies made the switch to low-grade ores and pellets. Mining natural ores was eventually phased out. 
  
  Utilizing taconite proved to be challenging. Fine-grain taconite required extensive grinding to separate the magnetite grains from non-ore minerals. In addition, the fine-grain magnetite concentrate was difficult to ship and to use in blast furnaces. At that time, 70% of the taconite ended up as tailings that needed to be disposed of. Throughout the first part of the 20^th century, a method known as gravity separation was utilized to process the taconite. In the 1940s, a new taconite processing method was developed using magnetic separation and pellet shipment. By 1947-8, the Reserve Mining Company opened its processing plant and began disposing of tailings into Lake Superior.

   

  1880s: First shipments of direct shipping ore from MN
  
  1900: Gravity separation necessary for some ores
  
  1940: 50% of all ore shipped from MN requires processing
  
  1940s: Taconite processing method developed (magnetic separation and pellet shipment)
  
  1947-1948: Reserve Mining Company opens taconite processing plant and disposes of tailings in Lake Superior
  1955: First ore processed by Reserve Mining
  
  1968: Taconite pellet shipment rate exceeds all other iron ore shipments from MN²

  Current Connections: PolyMet

  The Reserve Mining Case is relatable to a current and local mining issue: PolyMet’s proposed NorthMet Mining Project in northern MN. While the NorthMet mine would be a sulfide mine, its operation faces the same environmental justice issues as the Reserve taconite mine. Since 2004, PolyMet has been working through the environmental review process and moving forward to acquire permits to begin construction. They want to utilize open pit copper, nickel, cobalt, and precious metals mines as well as refurbish the old LTV Steel Mining Company plant, construct a new hydrometallurgical facility, and construct a new tailings basin. The major concern for this potential mining activity is acid mine drainage.
   
  1-Michael E. Berndt and Brice C. William, "The origins of public concern with taconite and human health: Reserve mining and the asbestos case," Regulatory Toxicology and Pharmacology 52, no. 10 (2008): S31-9.
  
  2-Berndt and William, "The origins of public concern with taconite and human health: Reserve mining and the asbestos case."