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

Drake, Harold J.
Stone,   pp. 1153-1173 ff. PDF (2.1 MB)

Page 1155

 STONE 1155 
items were marble slabs and paving tiles valued at $8.4 million, dressed
granite articles valued at $7.6 million, slate articles valued at $5.7 million,
and dressed travertine valued at $2.8 million. Tonnage of rough blocks of
marble and granite was well below that of the preceding year, whereas that
of travertine nearly doubled. 
 Italy and Portugal again supplied the great bulk of the marble and travertine
imports. Canada and Italy accounted for most of the imported granite. The
remainder was supplied by numerous small countries. 
 Argentina—One of the world's - largest deposits of black granite has
been reportedly found in Mendoza Province. The granite is said to be of excellent
quality and, on the surface, occurs as flagstone, which can be exploited
without the need for cutting. 
 Canada.—Production of dimension stone consists principally of granite,
limestone, marble, and sandstone. Approximately 80% of the output is used
in construction; the remainder is used as monumental or ornamental stone.
Granite, limestone, and marble are used in the form of cut and polished panels
in institutional and commercial buildings; limestone and sandstone are used
as ashlar in residential buildings. 
 Portugal.—Portugal continued to be one of the world's largest dimension
stone producers. In 1971 total production of dimension stone exceeded 9.4
million short tons, 72% of which was limestone and 19% was granite. The remainder
consisted of marble, slate, and miscellaneous stone such as diorite and gab-bro.
Large volumes of rough stone are exported to Italy where they are processed
and eventually reexported. 
 Production of crushed stone reached an alltime high of 922 million tons
valued at $1.6 billion in 1972. The advance was led by a 7% increase in the
output of limestone and dolomite to 671 million tons valued at $1.1 billion
and a 14% increase in the output of granite to 106 million tons valued at
$183 million. Production of traprock totaled 80 million tons valued at $171
million, an increase of 7% over the levels of 1971. Output of marble was
up 37% to 2.2 million tons valued at $25 rnillion. Offsetting the increased
production of these kinds of stone were declines in the production of marl,
sandstone, shell and other kinds of stone. Output of sandstone decreased
12% to 27 million tons valued at $58 million, output of shell decreased 10%
to 17 million tons valued at $30 million, and other stone declined 38% to
14 million tons valued at $24 million. Five States, Florida, Illinois, Ohio,
Pennsylvania, and Texas, accounted for one-third of the total production
of crushed stone in 1972. With the exception of Illinois each of these States
recorded increased output. The largest output was recorded by Pennsylvania,
which increased its output 4% to 67 million tons valued at $120 million.
1972, 14 States accounted for two-thirds of the total production of crushed
 Domestic producers during 1972 were concerned with rising labor and maintenance
costs accompanied by price controls, depletion of raw material, and pollution
control. Control of dust emission was the primary problem, although many
companies were also required -to treat process water and to reduce noise.
It is believed that more than half of the U.S. producers of crushed stone
now control dust emissions. Of interest to aggregate producers was the dust-collection
system installed by an asphalt producer, Hills Materials Co., Rapid City,
S. Dak.2 A new bag system collector was installed following a cyclone collector
used to return coarser dust particles to the mix. The new system collected
more than 99% of the fines, which were either returned to the system or sold
at an advantageous price. The principal market for the collected fines was
as a mineral filler, which contributed to the company's revenues. Of equal
importance was the goodwill generated in neighboring residential areas by
the comolete elimination of airborne dust. 
 2 Roads and Streets. Asphalt Plant Solves Dust Problem, Makes Valuable By-product.
V. 115, No- 7, July 1972, pp. 97—101. 

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