Libby Montana

Asbestos Contamination


A product used in insulation and other construction materials.

Monokote is another product that has been used as fire proofing material used in the construction of the World Trade Center twin towers in New York.


1919-1963 EN Alley - Zonolite Company

1963-1990 WR GRACE and Company


Rainy Creek northeast of Libby


Ed Alley a local rancher and prospector bought the mine and started the Zonolite Company

WR Grace Company bought the mine and operated it from 1963 until closure in 1990


Vermiculite was contaminated with asbestos which caused health complications

Effects of the Disaster

Lung cancer and cancer of the lung lining called mesothelioma, and restrictive lung disease which can be fatal