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

Baskin, G. David
Abrasive materials,   pp. 27-41 ff. PDF (1.5 MB)


Page 27

Abrasive Materials 
By G. David Baskin1 
 Changes in the 1978 quantity and value of the sales of various natural abrasives,
compared with the data for 1977, were of a mixed nature. Output of tripoli-type
materials and garnet increased in both tonnage and value. Emery production
also increased. But special silica stone product sales decreased in both
tonnage and value, and the reported quantity and value of sales of 
manufactured abrasive material also decreased for 1978. 
 In 1979 output of tripoli-type materials and special silica stone products
decreased in both tonnage and value when compared with the previous year.
The tonnage and value of sales of garnet and manufactured abrasives increased
when compared to 1978 data. 
Table 1.—Salient abrasives statistics in the United States 
Kind 
1975 
1976 
1977 
1978 
1979 
Natural abrasives (domestic) sold or used 
by producers: 
 Tripoli (crude) short tons_ — 
       Value thousand&. — Special sifica stone products'
 ton&.
—       Value thousand& — Garnet short ton&_
      Value
thousand& — 
 Emery short ton&_ 
 Value thousands 
80,562 
$565 
2,953 
$1,061 
17,204 
$1,690 
3,487 
w 
124,281 
$776 
2,696 
$1,404 
24,565 e$2,740 
W 
W 
125,661 
$777 
2,200 
$3,236 
20,022 e$2,234 
w 
W 
138,311 
$849 
e2,175 ~$2,630 
22,058 e~2,570 
W 
W 
e127,878 
~$33~ 
e1,944 ~$1,714 
23,303 e~2,831 
W 
W 
Artificial abrasives 2 3 short tons — 
 Value3 thousand&_ 
Foreign trade (natural and artificial abrasives): 
 Exports (value) do__ Reexports(value) do~ Imports for consumption (value)
do — 
528,307 
$141,580 
$102,849 
$28,362 
$121,863 
620,328 
$176,064 
$113,199 
$29,285 
' $157,232 
640,723 
$186,654 
$121,579 
$35,363 
' $192,870 
550,877 
$172,554 
$138,659 
$41,016 
$231,720 
712,733 
$230,024 
$185,587 
$92,838 
$270,556 
 eReti,,,~ta ' Revised. w withheld to avoid disclosing company proprietary
data. 
 1lncludes grinding pebbles, grindstoneè, oilstones, tube-mill
liners,
and whetstones. 
 2lncludes Canadian production of silicon carbide and aluminum oxide and
shipments of metallic abrasives by U.S. producers. 
 3lncludes U.S. and Canadian production of aluminum-zirconium oxide. 
FOREIGN TRADE 
 The 1978 import values of abrasive materials were 20% more than the 1977
import values, while the 1979 values increased 17% over the previous year.
U.S. exports plus reexports, not including metallic abrasives, increased
in value 14%.in 1978 and 55% in 1979. Net imports, the excess of imports
over exports and reexports, not including metallic abrasives, were valued
at $57.5 million in 1978 and $0.6 mfflion in 1979. 
 Industrial diamond imports into the United States in 1978 totaled 22.2 million
carats of loose material valued at $87.8 mfflion, a decrease of 2% in quantity
and an increase of 11% in value, compared with imports for 1977 and not including
diamond dies. In 1979 imports of industrial diamond totaled 25.3 million
carats valued at $110.9 million, an increase of 14% in quantity and 26% in
value, compared with the previous year. The exports of industrial diamond,
loose, totaled 19.1 million carats in 1978, an increase of 8%; their value
was $51.2 mulion, 15% more than the value for 1977. In 
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