History & Asbestos Use
Chrysotile asbestos was discovered in the Coalinga area in the early 1900s, and commercial mining ramped up through the mid-20th century. The KCAC (King City Asbestos Company) and other operators extracted asbestos from the serpentine rock deposits of the New Idria formation. Mining declined sharply in the 1980s as regulations tightened and demand fell. The area remains a known naturally occurring asbestos zone.