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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 411

  411Gypsum 
By J. W. Pressler' 
 The gypsum industry continued expanding in the biennial period of 1978-79,
as reflected by over 1.5 million new housing (public and private) unit starts
per year for the quadrennial period of 1976-79, with 1978 the record year,
slightly over 2 million starts. In 1978, output of crude gypsum increased
11% to a record 14.9 million tons, but decreased 2% in 1979. Production of
calcined gypsum increased 12% to 14 million tons in 1978, and continued with
an 
increase of 4% in 1979 to set a new annual record of 14.6 million tons. Sales
of gypsum products in 1978 increased 5% to 21.6 million tons, and increased
1% more in 1979 to 21.8 million tons. Imports of crude gypsum increased 17%
in 1978 to a record 8.3 million tons, but decreased 6% in 1979. Total value
of gypsum products sold in 1978 increased 25% to $1.1 billion, and followed
with a 13% increase in 1979 to $1.3 billion. 
Table 1.—Salient gypsum statistics 
(Thousand short tons and thousand dollars) 
1975 
1976 
1977 
1978 
1979 
United States: 
Activeminesandplants'                     
Crude: 
110 
117 
115 
116 
. 
113 
Mined                               
 Value                            
Imports for consumption                 Byproductgypsumsales            
Calcined: 
9,751 
$44,654 
5,448 
369 
11,980 
$59,888 
6,231 
573 
13,390 
$74,341 
7,074 
797 
14,891 
$92,726 
8,308 
669 
14,630 
$99,868 
7,773 
828 
Produced                             
Value                            
 Products sold (value)                        
 Exports(value)                            
 Imports for consumption (value)               World:Production_.       
9,181 
$186,478 
$525,051 
$10,481 
$19,817 
65,279 
11,036 
$236,775 
$654,860 
$32,594 
$21,756 
r73610 
12,590 
$277,835 
$910,526 
$15,703 
$31,398 
T79,042 
14,041 
$387,010 
$1,248,013 
$19,804 
$63,882 
84,586 
14,543 
$442,157 
$1,391,993 
$22,388 
$65,079 
81,954 
r~ 
 ' Each mine, calcining plant, or combination mine and plant is counted as
one establishment; includes plants that sold byproduct gypsum. 
DOMESTIC PRODUCTION 
 The United States was the world's leading producer of gypsum, accounting
for 18% of the total world output. 
 In 1979, 42 companies mined crude gypsum at 65 mines in 22 States. Output
decreased 2% compared with the record year of 1978. Leading producing States
were Michigan, Texas, Iowa, California, Oklahoma, and Nevada. These six States
produced more than 1 million tons each and together accounted for 71% of
the total 
domestic production. Stocks of crude ore at mines and plants at yearend 1979
were 3.9 million tons. 
 Leading companies in 1979 were United States Gypsum Co. (12 mines), National
Gypsum Co. and Georgia-Pacific Corp. (6 mines each), Celotex Div. of Jim
Walter Corp. (4 mines), The Flintkote Co. (3 mines), and Pacific Coast Building
Products, Inc. (1 mine). These 6 companies, operating 32 mines, produced
82% of the total crude 


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