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- The Libby mine was the source of an estimated 70-90% of all vermiculite sold in the US from 1919 to 1990.
- Veins of asbestos contaminated most, if not all of the material taken from the mine; Libby Amphibole was an accessory mineral."
- The Libby mine in 1926 opened up a vein of asbestos that is considered one of the largest deposits of asbestos ever uncovered.
- Regardless of the method used to analyze the material a mixture of regulated asbestos as well as non-regulated asbestos is likely to be encountered.
- "Libby Amphiboles" is a collective term for the complex mixture of amphiboles that are known to exist at the Libby mine site. That mixture is Winchite (nonregulated amphibole); Richterite (nonregulated amphibole); and Tremolite (regulated amphibole).
- Increased mortality rates are observed not only among the miners and their families, even in citizens with no direct connection to the mine. Mortality rates are 40 times higher than the rest of Montana and 60 times higher than the rest of the US.