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Bureau of Mines / Minerals yearbook metals, minerals, and fuels 1972
Year 1972, Volume 1 (1972)

Clarke, Robert G.
Abrasive materials,   pp. 123-134 PDF (1.1 MB)


Page 123

 1968 1969 1970 1971 1972 
 85,534 84,673 68,105 75,134 87,864 
 $796 $734 $520 $569 $797 
 3,141 3,311 3,134 2,349 3,241 
 $629 $600 $665 $563 $670 
 22,186 20,458 18,837 18,984 18,916 
 $1,922 $1,874 $1,936 $1,934 $1,957 
 W W W 1,586 2,883 
 W W W W W 
 567,814 608,622 561,107 472,299 584,680 
 $86,316 $92,589 $85,772 $79,027 $92,958 
 $70,687 $64,338 $60,685 $64,219 
 $20,373 $28,085 $21,711 $26,746 
 $100,748 $96,467 $89,085 $106,512 
 W Withheld to avoid disclosing individual company confidential data. 
 1 Includes grinding pebbles, grindstones, oilstones, tube-mill liners, and
whetstones. 
 2 Production of silicon carbide and aluminum oxide (United States and Canada);
shipments of metallic abrasives (United States). 
  123Abrasive Materials 
By Robert G. Clarke ' a 
 The output of natural abrasives increased 15% in quantity compared to that
of 1971, and the value increased 12%, excluding the value of emery. Production
of tripoli types increased 17% in quantity and 40% in value. Output of silica
stone products increased 38% in quantity and 19% in value. The production
of garnet was essentially 
unchanged in quantity but increased 1% 
in value. The production of emery increased 82% in quantity. 
 The production of artificial abrasives increased in both quantity and value
for all types. Production of aluminum oxide increased 23% in quantity and
17% in value. 
Production of silicon carbide increased 28% in quantity and 17% in value.
Production of metallic abrasives increased 22% in quantity and 19% in value.
The overall increases for artificial abrasives were 24% in 
quantity and 18% in value. 
 Industrial diamond imports increased 14% in value. Exports plus reexports
of industrial diamond increased 18% in carat- 
age and 20% in value. 
FOREiGN TRADE 
 Imports of abrasive materials reversed the decline that started in 1968
and were 20% more in value than in 1971. Exports plus reexports also increased.
Net imports, the excess of imports over exports and reexports, were $15.5
million, a 132% increase iisrer 1971 net imports. The domestic manufacture
of synthetic diamond and export trade in other industrial diamond had an
important influence on the value of exports. 
 1 Physical scientist, Division of Nonmetallic Minerals. - 
Table 1.—Salient abrasive statistics in the United States 
Kind 
Natural abrasives (domestic) sold or used by 
 producers: 
   Tripoli short tons.... 
      Value thousands.... 
   Special silica-stone products 1 short tons.... 
      Value thousands.... 
   Garnet short tons.... 
      Value thousands.... 
   Emery short tons.... 
      Value thousands.... 
Artificial abrasives 2 short tons.... 
   Value thousands.... 
Foreign trade (natural and artificial abrasives): 
 Exports (value) do........ $60,266 
 Reexports (value) do........ $19,807 
 Imports for consumption (value) do...... - $103, 150 


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