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Bureau of Mines / Minerals yearbook: Metals and minerals 1978-79
Year 1978-79, Volume 1 (1978-1979)

Pressler, J. W.
Gypsum,   pp. 411-422 PDF (1.6 MB)

Page 412

gypsum in 1979. 
 Leading individual mines in 1979 were United States Gypsum's Alabaster mine
in losco County, Mich.; United States Gypsum's Plaster City mine in Imperial
County, Calif.; National Gypsum's Tawas mine in losco County, Mich.; United
States Gypsum's Sweetwater mine in Nolan County, Tex.; United States Gypsum's
Sigurd mine in Sevier County Utah; United States Gypsum's Shoals mine in
Martin County, md.; and Georgia-Pacific's Acme mine in Hardeman County, Tex.
These seven mines accounted for 37% of the national total. Average output
per mine in 1979 for the 65 U.S. mines was 225,000 tons, compared with 194,000
tons per mine in 1.77. 
 In 1979, 13 companies calcined gypsum at 72 plants in 30 States. Output
increased from 12.6 million tons of calcine valued at $278 million m 1977
to 145 million tons valued at $442 million in 1979, a tonnage increase of
16% and a value increase of 59% compared with that of 1977. Output in 1979
was a new annual record. Leading States were California, Texas, New York,
and Iowa. These 4 States, with 23 plants, accounted for 38% of the national
 Leading companies were United States Gypsum Co. (22 plants), National Gypsum
Co. (19 plants), Georgia-Pacific Corp. (9 plants), The Flintkote Co. (6 plants),
and Celotex Div. of Jim Walter Corp. (5 plants). These 5 companies, operating
61 plants, accounted for 84% of the national output in 
 Leading individual plants were United States Gypsum's Plaster City plant,
Imperial County, Calif; United States Gypsum's Stony Point plant, Rockland
County, N.Y.; United States Gypsum's Detroit plant in Wayne County, Mich.;
Weyerhaeuser's Briar plant, Howard County, Ark.; United States Gypsum's Shoals
plant, Martin County, md.; Pacific Coast Building Product's plant in Clark
County, Nev.; GeorgiaPacific's Acme plant, Hardeman County, Tex.; United
States Gypsum's Southard plant, Blame County, Okla.; United States 
Gypsum's Sweetwater plant, Nolan County, Tex.; and United States Gypsum's
Fort. Dodge plant, Webster County, Iowa. These 10 plants accounted for 30%
of the national output. Average output per plant in 1979 for the 72 U.S.
plants was 202,000 tons, compared with 177,000 tons per plant in 1977. 
 In 1979, the following companies sold a total of 828,000 tons of byproduct
gypsum, valued at $5 million, for agricultural purposes: Occidental Petroleum
Corp., Allied Chemical Corp., Valley Nitrogen Producers Inc., and Victor
Material Co. (all in California), Occidental Petroleum Corp. (Florida), Texasgulf
Inc. (North Carolina), and American Cyanamid Co. (Georgia). 
 Several gypsumboard plant expansions and two plant startups increased the
national production capacity an additional 1.23 billion square feet per year.
The available capacity of operating. gypsumboard plants in the United States
at yearend 1979 was 18.23 billion square feet per year, a 7% increase compared
with that of yearend 1977. Total 1979 gypsumboard production in the United
States was 16.7 billion square feet. This indicated a 92% national utilization
of capacity for the year. In 1978-79, National Gypsum Co. began operations
of two new gypsum wallboard plants, one in Rensselaer in Rensselaer County,
N. Y., and the other in Wilmington, New Hanover County, N. C. The company
also announced that the output of the Phoenix, Ariz., plant would be increased
40% by 1980. United States Gypsum Co. announced several plant expansions
and modernizations during the biennium, including the Philadelphia, Pa.,
plant and the Sweetwater, Tex., plant. The Philadelphia plant is one of the
oldest in the United States, and has produced more than 4 billion square
feet of wallboard since 1929. In 1979, Domtar Gypsum. America, Inc., completed
the multimillion-dollar expansions of its two wallboard plants in Long Beach
and Antioch, Calif., which represents a total 32% increase in capacity.2

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