Kohler & Chase property, Monticello, California

The U.S. Bureau of Mines' Minerals Yearbook for 1941 reported that Kohler & Chase, of 26 O'Farrell Street, San Francisco, was "developing a short-fiber chrysotile asbestos deposit near Monticello, Napa County, about 18 miles north of Napa," California.¹ "Quarry equipment was procured, and a mill was under construction in 1941," the yearbook said, and "a small quantity of fiber has already been produced and sold."¹ The yearbook for 1942 reported that the company "produced short-fiber chrysotile from its property near Monticello."² For 1943 it named Kohler & Chase as "the only producer of asbestos in California making sales in 1943, as in 1942," and for 1944 as one of "two producers of asbestos in California."^3,4

The documents report this mine producing asbestos fiber for sale.³

Location

Year by year

Every statement about this mine in the documents, in each document's own words, by the year it is about.

1941

• Worked: “A small quantity of fiber has already been produced and sold” (Kohler & Chase), p. 3¹
• Exploration: “Kohler & Chase, 26 O'Farrell St., San Francisco, is developing a short-fiber chrysotile asbestos deposit near Monticello, Napa County, about 18 miles north of Napa” (Kohler & Chase), p. 3¹
• Mill: “Quarry equipment was procured, and a mill was under construction in 1941” (Kohler & Chase), p. 3¹

1942

• Worked: “Kohler & Chase ... produced short-fiber chrysotile from its property near Monticello, Napa County” (Kohler & Chase), p. 4²

1943

• Worked: “The only producer of asbestos in California making sales in 1943, as in 1942, was Kohler & Chase, miners of short-fiber chrysotile near Monticello, Napa County” (Kohler & Chase), p. 3³

1944

• Worked: “Kohler & Chase, miners of short-fiber chrysotile near Monticello, Napa County” (Kohler & Chase), p. 3⁴

See also

• Asbestos exposure sites in California
• All asbestos mines

References

1. Minerals Yearbook: Asbestos Chapters, 1941 (January 1, 1942), p. 3.
2. Minerals Yearbook: Asbestos Chapters, 1942 (January 1, 1943), p. 4.
3. Minerals Yearbook: Asbestos Chapters, 1943 (January 1, 1944), p. 3.
4. Minerals Yearbook: Asbestos Chapters, 1944 (January 1, 1945), p. 3.