Coalinga District

The Coalinga District is a region in western Fresno County, California, on the eastern slope of the Diablo Range, that was home to the largest chrysotile asbestos mining operation in the United States. From the 1960s through the 1970s, open-pit mines in this district, most notably those operated by Union Carbide, produced short-fiber chrysotile asbestos that was shipped nationwide for use in joint compounds, paints, plastics, and construction products.

Origin

The town of Coalinga was named in the early 1900s from "Coaling Station A," a Southern Pacific Railroad coal stop. Commercial asbestos mining in the surrounding serpentinite belt began in earnest in 1959 when Union Carbide opened its Coalinga operation, which became the dominant domestic source of chrysotile until mining ceased in the mid-1970s amid mounting health concerns and regulatory pressure.

Significance in Asbestos Context

For patients with mesothelioma or other asbestos diseases, the Coalinga District matters because its chrysotile was the raw fiber in many widely used American consumer and construction products from the 1960s and 1970s, including Union Carbide's "Calidria" brand asbestos used in joint compounds, texture sprays, and plasters sold under many brand names. If you worked with drywall, taping compounds, or sprayed ceiling textures during that era, the fiber you inhaled may well have come from Coalinga. The district is also significant in litigation because Union Carbide marketed Calidria as a "safer" short-fiber chrysotile, a claim that internal documents and later scientific evidence have undermined; fiber-type and trace-mineral analysis can sometimes tie lung or tissue samples back to a Coalinga source, strengthening identification of specific defendants.

Example Sentence

The industrial hygienist's report noted that the joint compound the patient sanded throughout the 1970s contained Calidria chrysotile mined from the Coalinga District by Union Carbide.

Related Terms

Chrysotile, Union Carbide, Calidria, Joint Compound, Serpentinite, Provenance Analysis

Notes

• If you or a loved one worked in construction, drywall finishing, auto body, or plastics manufacturing in the 1960s–1970s, ask your legal team whether Union Carbide Calidria chrysotile (Coalinga-sourced) appears in the product identification analysis for your case.
• Preserve any product packaging, purchase records, employment records, or co-worker statements that name specific joint compounds, texture sprays, or paints. These often trace back to Coalinga fiber.
• Ask a qualified mineralogist or pathologist whether fiber-burden analysis of lung tissue or lymph nodes could distinguish Coalinga chrysotile from other sources; trace tremolite and accessory minerals can sometimes support provenance.
• Be aware that defendants frequently argue Coalinga chrysotile was "short-fiber" and therefore less hazardous, a contested claim your experts should be prepared to address with current scientific literature.