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Bureau of Mines / Minerals yearbook: Area reports: domestic 1978-79
Year 1978-79, Volume 2 (1978-1979)

Hill, James J.; Prosser, L. J., Jr.
Indiana,   pp. 189-200 PDF (1.2 MB)

Page 194

 1975 2 16 1092 1945 1094 1961 
 1976 2 21 1,263 2,288 1,265 2,309 
 1977 1 20 1266 2216 1268 2237 
 1978 1 15 1,276 2,480 1,277 2,495 
 1979 1 15 1,184 2,325 1,185. 2,341 
 Fluorspar.—Briquets were fabricated from fluorspar obtained from
Mexico, South Africa, and domestic producers by National Briquet Corp. at
its Lake County facility in East Chicago. The briquets were sold to the steel
industry for use as a flux. 
 Gypsum.—Indiana ranked sixth among the 22 producing States in
Crude gypsum was mined by United States Gypsum Co. and National Gypsum Co.
from underground sites in Martin County, in southwestern Indiana. United
States Gypsum operated a calcining plant in Lake County in the northwestern
part of the State, and additional gypsum was imported from Michigan by lake
carrier. Miles Laboratories, Inc., calcined byproduct gypsum in Elkhart County,
in northern Indiana. Most of the gypsum was calcined for use in wallboard
and sheathing. A lesser quantity was sold for use in the manufacture of cement.
United States Gypsum completed expansion of its wallboard plant, which 
increased capacity by 25%. 
 In 1979, the United States Gypsum's underground mine at Shoals was named
the safest nonmetal mine in the Nation by the American Mining Congress and
the U.S. Department of Labor and received the Sentinels of Safety Award.
Mine personnel established a record of over 1.9 million employee hours without
a disabling injury. 
 Lime.—During 1978-79, Indiana ranked sixth in the Nation in lime
Two firms, Marblehead Lime Co., Buffington, and Inland Steel Co., Indiana
Harbor, produced quicklime in Lake County. Most of the lime was used by the
steel industry to increase the fluidity of slag. 
 Peat.—Nationally, Indiana continued to rank fourth in the production
of peat, accounting for about 9% of the output in 197879. Reed sedge and
humus were produced in nine counties and processed for soil conditioning
and horticultural purposes. Peat was harvested using vacuum equipment and
standard earth-moving machinery. 
shortage in the latter part of 1978 and early were used in the manufacture
of construc1979 Some plants shipped on an allocation tion materials such
as lightweight aggrebasis to supply regular customers gate brick cement and
tile A decrease m 
 In 1978 Universal Atlas Cement a divi construction activity in 1979 resulted
in a sion of United States Steel Corp Buffing decline in clay and shale production
corn ton was ordered by the Environmental pared with that of the previous
year Protection Agency to reduce particulate In 1978, General Shale Products
Corp. emissions from two kilns The plant cur initiated a new coal firing
system for its tailed production while pollution abatement brick tunnel kiln
at the Mooresville plant in equipment was mstalled By January 1979 Morgan
County The firm has a patent on particulate emissions were within mandat
the system which uses low ash and low ed limits, allowing full operation
to re- sulfur coal imported from Tennessee. The sume At yearend however United
States coal is crushed screened and dried at the Steel announced that the
Buffington ce- plant and then blown into the kiln The coal ment plant was
one of a number of oper system uses 30% less energy than oil or ations around
the country scheduled for natural gas to produce brick; however, oil or permanent
closing natural gas is needed to start the kiln and 
 Clays —In 1979 clay and shale were bring it up to operating temperatures
mined by 17 companies at 20 pits. Approx- Bloomington Crushed Stone Co.,
Inc., a imately 50% of the production was from leading producer of common
clay m 1977 78 Clay and Morgan Counties m the west reported no production
for 1979 from its central part of the State Clay and shale Lawrence County
Table 4.—Indiana: Clays sold or used by producers, by kind 
(Thousand short tons and thousand dollars) 
 Fire clay Year 
 Quantity Value 
n clay 
Quantity Value 
' Data may not add to totals shown because of independent rounding. 

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