A piece of brick that was dumped in to the bayou in hopes of reinvigorating the oyster beds
1 2016-04-25T14:42:49-07:00 Katie Amundson 42988e4e547de9c7fdc0bc3280c22bc961de7e06 7601 1 plain 2016-04-25T14:42:49-07:00 CNN.com April 29, 2013 John Nowak Katie Amundson 42988e4e547de9c7fdc0bc3280c22bc961de7e06This page is referenced by:
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Taconite Mining: The Reserve Mining Company
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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. 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).
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.
History of Taconite Mining
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 20th 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.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.
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Impacts on Economy
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The effect the spill had on the economy was first seen in the communities along the coast of the Gulf, but it was soon felt throughout the entire nation.
A “fishery disaster” was declared in the Gulf of Mexico by the U.S. Commerce Secretary because of the devastating economic impacts the oil spill had on commercial and recreation fishing. The area included Louisiana, Mississippi, and Alabama. It was hoped that this would help mobilize relief efforts.Seafood industry
The Deepwater Horizon oil spill had a tremendous impact on the economy. Commercial fishermen, business selling seafood, and tourism businesses drastically plummeted.Seafood safety
There was great concern about the safety of seafood after the spill¹. Many people were worried that the chemicals from the spill, either the oil itself or those used during the cleanup, had contaminated the fish making them unsafe to eat. Thousands of sample of seafood from the Gulf were tested for contamination and safety. Areas where oil was present was closed to fishing and were continuously tested until they were deemed safe by aerial surveys, satellite images, and water quality testing.
How does seafood become contaminated³?
- Animals eat the droplets of oil or eat other animals that ate the oil or were exposed to chemicals.
- Chemicals can be absorbed by fish through their skin or gills.
The oil was a major concern. There are many chemicals in oil that are harmful, such as certain kinds of polycyclic aromatic hydrocarbons (PAHs)¹. PAHs can cause mutations, developmental defects, or cancer in both wildlife and humans. Other harmful substances in crude oil and the drilling fluids used to extract it are:- Arsenic
- Mercury
- Copper
- Lead
Also of concern were the chemical dispersants used in the cleanup. Corexit was the dispersant used to help cleanup the spill¹. The FDA said that this dispersant had a low potential to build up in seafood and become toxic to humans. So there was little risk to human health from eating seafood that came in contact with dispersants.
Scientists tested over 22,000 samples of seafood from the Gulf¹. It was found that all of the seafood tested was safe to eat. Those results did not stop people from being afraid to buy seafood, which contributed to devastation of the seafood industry after the oil spill. Seafood from the Gulf continues to be tested.Fishing
40 percent of America’s seafood comes from the Gulf of Mexico and many people along the coast rely on the industry for their livelihoods. The oil spill caused the seafood industry to plummet, resulting in hardships and uncertainties for businesses and forcing many out of the business.
Fishermen in the Gulf are fishing for blue crab, fish (menhaden), oysters, and shrimp². Shrimp was one of the hardest hit. In 2008, the total revenue for shrimp from the states of Alabama, Mississippi, Louisiana, Texas, and west Florida was $366 million. In 2010, after the spill, shrimp catches from the Gulf decreased by 35.6 million pounds, which is 27%. State by state, catches decreased by- Louisiana: 32%
- Mississippi: 60%
- Alabama: 56%
- Texas: 15%
Fishermen were impacted due to the closures of many fishing areas. They were unable to take their boats out and collect fish for their income. At their largest size, a total of 88,522 square miles, the proportions of areas of closure were:- Alabama: 40%
- Florida: 2%
- Louisiana: 55%
- Mississippi: 95%
- Federal waters of Gulf of Mexico: 37%
Catches also dramatically decreased due to sick and dying fish and destroyed habitats. It takes three to five years for a habitat to heal and be able to support life again. Techniques were used to help foster growth in habitats after they were destroyed from the oil spill. For example, bricks, fresh limestone, ground up shells, and crushed concrete were put in the water to help foster growth in oyster beds.
Oysters were harmed by a technique used to keep oil from reaching Louisiana estuaries, or river inlets. More freshwater than usual was released into estuaries to keep the oil away, but this decreased salinity in the oyster habitats that is vital to their survival.Marinas
Marinas were also impacted negatively by the spill. They were selling much less gas to fishermen than usual. Because there were fewer opportunities due to closures and their catches decreased in size, it often was not worth it to buy fuel and take the boat out for what catch they would get.
“$300 worth of fuel. $100 of other expenses and I pay the deckhand, I got $150 on a perfect day. It don’t pay to go out.”
-George Barisich, oyster fishermanMarkets
Because of fishermen going out of business, the loss of fish and other seafood, and the decrease in demand of seafood, many seafood markets went out of business. It could be very difficult for these markets to come back. A survey by the Louisiana Seafood Promotion Board reported that 70% of consumers were concerned about the safety of seafood and that 23% reduced the amount of seafood they ate.Tourism
Recreational fishing is a major source of income for tourism along the coast of the Gulf. Many businesses tied to tourism, such as hotels and restaurants, were harmed by the spill. Fishermen were not coming because so many areas of water were closed to fishing. Restaurant prices skyrocketed due to the lack of seafood harvest, which was seen as far away as New York. There were thousands hotel cancelations in the area, because visitors were afraid of the oil.Economic benefits
There were some short-term benefits from cleanup efforts. Cleanup workers and the reporters covering the event stayed in hotels and ate at restaurants replacing some of the lost business. The cleanup also helped companies who specialize in the materials used in the cleanup such as the booms and chemical dispersants. Those with hazardous material training also felt a boom in business.
- Graham, L. J., Hale, C., Maung-Douglass, E., Sempier, S., Swann, L., & Wilson, M. (2015). Oil Spill Science: the deepwater horizon oil spill's impact on gulf seafood. Gulf of Mexico Research Initiative. Sea Grant.
- Upton, H. F. (2011). The Deepwater Horizon Oil Spill and the Gulf of Mexico Fishing Industry. Analyst in Natural Resources Policy . Congresional Research Innitiative.