Jeffrey mine
Val-des-Sources, Canada
The Jeffrey Mine, was a large chrysotile asbestos mine located in the town of Val-des-Sources, which was formerly known as Asbestos, in southeastern Quebec, Canada. For much of the 20th century, it was the world’s largest asbestos mine and the dominant employer in the region. It also became internationally renowned among mineralogists and collectors for producing exceptional mineral specimens, including grossulars and vesuvianite crystals.
Mine data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).