Quick Facts About Asbestos in Wyoming
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About Wyoming

Wyoming’s vermiculite processing plants also put workers in danger of developing mesothelioma or other serious illnesses, such as asbestosis and lung cancer. Contaminated materials from the W.R. Grace mine in Libby, Montana, were shipped to four vermiculite processing plants in Wyoming. More than 8,851 tons of Libby’s asbestos-tainted vermiculite were “exfoliated” by refinery workers at these plants, where they were responsible for transporting, heating, packaging and shipping the mineral.

Refinery workers at these plants transported and heated 8,851 tons of Libby’s asbestos-tainted vermiculite in a process known as exfoliation. They also packaged and shipped the mineral.

Residents of Wyoming also face asbestos exposure risks in old buildings throughout the state. For example, in December 2021, city officials in Cheyenne, Wyoming, delayed the purchase of an old motel because of asbestos concerns. An asbestos removal project is necessary for the safe demolition or renovation of the property’s buildings, but it will cost an estimated $2.1 million.

Occupations at Risk in Wyoming

Wyoming’s abundant petroleum sources made it a hotspot for refineries. Workers at these refineries often worked with high-temperature machines that were insulated with asbestos. Construction workers who repaired these facilities may have come in contact with contaminated tiles, panels or insulation.

Power station workers were also at an elevated risk for inhaling asbestos. Refineries and power plants were often built using the mineral or were home to various forms of asbestos insulation, and the workers faced exposure threats when fixing damaged machinery or renovating the buildings.

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Treatment Centers near Wyoming

University of Colorado Cancer Center
1665 Aurora Ct, Aurora, CO 80045
  • Year Built: 1985
  • Number of Beds: Over 400 beds in main hospital
  • Number of Physicians: 2
Kalispell Regional Medical Center
310 Sunnyview Ln, Kalispell, MT 59901
  • Year Built: 1910
  • Number of Physicians: 2
Cancer Care Northwest
101 W. 8th Avenue, Spokane, WA 99204
  • Year Built: 1975
  • Number of Physicians: 1
Comprehensive Cancer Centers of Nevada
3730 S. Eastern Ave, Las Vegas, NV, 89169
  • Year Built: Formed in 2000; named in 2002
  • Number of Beds: 7 outpatient treatment centers
  • Number of Physicians: 2
Mayo Clinic Arizona
13400 East Shea Blvd, Scottsdale, AZ 85259
  • Year Built: 1987
  • Number of Beds: 244 Beds
  • Number of Physicians: 2
Banner MD Anderson Cancer Center
1900 N. Higley Road, Gilbert, AZ 85234
  • Year Built: 2007
  • Number of Beds: 177
  • Number of Physicians: 1
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Jobsites with Known Exposure


Commercial asbestos mining in Wyoming peaked between 1905 and 1921. Casper Mountain was the largest such mine in the state, producing fibers of more than an inch in length. More than half of the material in the serpentine deposits at Casper Mountain was asbestos.

Other deposits included:

  • Brown Bear
  • Smith Creek
  • Laramie Mountain
  • Fire King
  • Beaver Creek

The Fire King deposit specialized in producing chrysotile blocks for chimneys, while Smith Creek and Casper Mountain’s asbestos was primarily shipped to flooring manufacturers.


Frontier Oil and Sinclair Oil are two prominent oil refineries in Wyoming. The refineries, both built prior to the 1970s, used asbestos during construction. Over the decades, the workplaces exposed countless individuals to the hazardous fiber.

Other oil refineries in Wyoming included:

  • Consumer Oil
  • Fargo Oil
  • Continental Oil
  • Mutual Oil Company

Coal refineries were also scattered across the state. Like oil refineries, these facilities were home to large quantities of asbestos-insulated equipment.

Vermiculite refineries were also a significant part of Wyoming’s industrial economy. Four refineries received shipments of Libby’s contaminated vermiculite. Workers at these refineries handled as many as 221 shipments of vermiculite from the W.R. Grace mine.

Wyoming’s vermiculite refineries were located in:

  • Cody
  • Lovell
  • Burlington
  • Thermopolis

Power Plants

Black Hills Power’s facility in Osage was constructed with asbestos insulation around its boilers. Anyone who worked for the company prior to 1993 may have been exposed to the toxic mineral. By 1993, however, the company had completed an abatement project. Although some encapsulated asbestos was left in place, the facility was deemed safe.

Similarly, PacifiCorp‘s Dave Johnston Power Plant was built with asbestos insulation surrounding the boiler machinery. In 2007, the company began installing air pollution control equipment to help reduce the risk of exposure to various contaminants.

University of Wyoming

As with many private buildings constructed before the 1980s, the University of Wyoming was built with contaminated materials. In 2009 the college was issued a violation by the Department of Environmental Quality for failing to conduct asbestos inspections and remove asbestos-contaminated materials before demolishing several campus buildings. As a result, asbestos-containing materials were scattered during the demolition.

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