Sand and Gravel
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Crushed stone aggregates are produced
from many natural deposits including; limestone, granite, trap rock
and other durable mineral resources.
Production of these products
requires blasting and excavating the broken stone from quarries
followed by progressive stages of crushing, screening, washing and
blending.
Our aggregate products range in size from Rip-Rap, where
each stone may weigh several tons, to manufactured sand for use in
concrete and asphalt products.
The numerous sizes and gradations are
determined by their intended use and each complies with the
specifications established by governmental agencies or our
customer's requirements.
Crushed stone is used in the construction
of highways, railroads, airports, water and sewage systems, office
buildings, factories and our homes.
Beyond these "aggregate" uses,
crushed rock is also manufactured into fertilizer and mineral
components used in: roofing shingles, animal feeds, toothpaste and
many other household products.
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Sand and gravel
aggregate is produced in each of Aggregate Industries' regional
business units.
These resources, harvested from both glacial and
alluvial deposits, are processed by a series of crushing, screening
and washing operations.
The aggregate produced is subsequently used
in the manufacture of ready mixed concrete, asphalt, pre-cast
concrete products and as natural mineral base and for many other
uses in most construction projects.
Our diligent quality control and
flexible processing plants ensure that a wide variety of products
are available to meet the needs and specifications of federal, state
and local agencies, as well as commercial and residential
contractors.
Our sand and gravel products are also used for ice
control to keep highways safe during inclement weather, for
filtration purposes and have been used to rebuild beach environments
along the shores of Lake Michigan. Aggregate Industries utilizes
trucks, railroads and barges to deliver these products to our
customers.
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Sand and Gravel Mining for Aggregate
Sand and
gravel are crucial resources to economic development activities, such as
road building and concrete production. Construction of one mile of
four-lane interstate highway requires 85,000 tons of aggregate; the
average six room house requires 90 tons. "Aggregate" is any of several
hard inert materials (as sand, gravel, or slag) used for mixing with a
cementing material to form concrete, mortar, or plaster.
Sierra Leone is fortunate in having an abundance of
sand and gravel well distributed throughout the state.
SIERRA LEONE - SL
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