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

Meisinger, Arthur C.
Pumice and volcanic cinder,   pp. 729-733 ff. PDF (503.1 KB)


Page 729

  729Pumice and Volcanic Cinder 
By Arthur C. Meisinger1 
 U.S. production of pumice and volcanic 
cinder (including pumicite and scoria) in 1979 was 4.4 million tons valued
at $16 
million, or 7% less in quantity but 10% more in value than the 1978 record
output of 4.8 million tons and $14.5 million, respectively. The 1979 output
came from 306 operations in 11 States, compared with 320 operations in 13
States in 1978. Four States, Arizona, California, Nevada, and Oregon, accounted
for about three-quarters, or 3.3 million tons of the amount sold and used
by producers in 1979, compared with 3.6 million tons in 1978. 
 U.S. consumption of volcanic cinder and scoria in 1979 decreased 9% in quantity
but increased 14% in value compared with that of 1978. Road construction
and maintenance, the major use of volcanic cinder and scoria, accounted for
57% of the total output in 1979, compared with 60% in 1978. 
 U.S. consumption (excluding imports) of 
pumice and pumicite also declined in 1979, but the value of material sold
and used established a new high of $5 million that exceeded the 1978 record
of $4.8 million by 4%. The principal end use of pumice and pumicite continued
to be in concrete admixture and aggregate; however, this decreased to 1.09
million tons in 1979, compared with 1.15 million tons in 1978. 
 The weighted average value of pumice and related volcanic materials in 1979
increased 19% to $3.62 per ton from $3.04 per ton in 1978. With few exceptions,
average values per ton for the principal end uses in 1979 were higher than
those of 1978. 
 Pumice imported for consumption in 1979 decreased significantly (71%) in
quantity from that in 1978, primarily owing to structural damage of loading
and docking facilities on Yali Island, Greece, in late 1978 that resulted
in a year-long stoppage of pumice shipments to the United States. 
Table 1.—Salient pumice and volcanic cinder statistics 
(Thousand short tons and thousand dollars) 
 1975 1976 1977 1978 1979 
United States: Sold and used by producers: 
Pumice and pumicite  Value'______________________________________ 
 Average value per ton___________________________ Volcaniccinderandscoria_________________________
 Value' 
 Average value per ton  Exports_______________________________________ Importsforconsumption___________________________
World: Production, pumice and related volcanic materials — —
— — emtta,ate 5Preliminary. ~ 
' Values fob. mine and/or mill. 
 790 906 1,178 1,208 1,173 
 $3,493 $3,830 $4,625 $4,836 $5,008 
 $4.42 $4.23 $3.93 $4.00 $4.27 
 3,102 3,228 2,831 3,549 3,241 
 $7,710 $6,636 $7,340 $9,619 $10,953 
 $2.49 $2.06 $2.59 $2.71 $3.38 
 1 1 2 e2 e2 
 145 81 253 216 62 
 r16 200 r16,800 18,000 P~9~~yj e19~0 


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