The facts below are current as of 2009. They were compiled by the Indiana Mineral Aggregates Association, Indiana Geological Survey, National Stone, Sand & Gravel Association and the U.S. Geological Survey. Special thanks to Kathryn Shaffer of the Indiana Geological Survey and Mary Foster, an industry researcher.
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Indiana Aggregates Quick Facts:
- Aggregates are produced from 241 surface and underground mines located throughout Indiana.
- Aggregate mining occurs in 79 of the 92 Indiana counties.
- The majority of aggregate plants in Indiana are family-owned and operate with 20 or fewer employees.
- Indiana ranked 10th nationally in crushed stone production and 12th in sand and gravel production in 2009.
- Approximately 28,603 lbs. of aggregate are required for each Indiana resident per year.
- 83.3 million tons of crushed stone, sand and gravel were produced in Indiana in 2009.
- Indiana ranks 1st nationally in the production of air-cooled blast furnace and steel furnace slag. In 2009, 4 million tons were produced in the Hoosier state.
- Slag is used as the surface material at the Indianapolis Motor Speedway because its angular, sharp texture creates excellent traction and skid resistance.
What’s the Economic Impact?
The aggregate industry constitutes an integral segment of the nation’s economy. This $21.2 billion dollar industry supplies construction materials for the transportation industry, and more than 90% of aggregate production is used directly or indirectly by the construction industry.
Aggregate operations create attractive job opportunities and a strong tax base for local communities. Aggregates are essential construction materials for residential and commercial development, as well as for improvements to infrastructure projects such as roads, bridges, dams, hospitals, schools and water/sewer systems. Every $1 million in aggregate industry sales creates 19.5 jobs (National Stone, Sand & Gravel Association).
Indiana by the Numbers
- 2,300 workers employed by the Indiana aggregate industry in 2009.
- $97,181,000 wages generated by the Indiana aggregate industry in 2009.
- $4,275,964 Indiana income tax generated by the Indiana aggregate industry in 2009.
The Industry & Environmental Stewardship
- A number of lakes resulting from aggregate excavation have been reclaimed to make excellent water recreational facilities. These lakes also aid in recharging the groundwater aquifers, providing sources of water for cities and towns.
- Many old aggregate mines are now parks, wildlife habitats, and sites for office complexes, apartments and housing communities.
- The aggregate industry and its partners work to recycle old concrete and asphalt pavement, crushing and sorting it like rock so that it can be reused.
- Limestone and dolomite are key ingredients for the removal of sulfur dioxide created when high-sulfur coal is burned in electricity plants. Indiana has several plants producing material for limestone scrubbers and other air-cleaning systems, providing Hoosiers with cleaner air to breathe.
Why is Indiana Transportation Infrastructure so Important?
- Between 65-70% of all freight is transported over our highways, which serve as connectors with water, rail and facilities.
- About 80% of all Indiana aggregate is transported by truck, 18% by barge and 2% by other transportation.
- One mile of two-lane concrete highway is 24 feet wide and 12 inches thick and requires 7,205 tons of aggregate materials to build.
- One mile of two-lane asphalt pavement is 24 feet wide and 14 inches thick and requires 10,300 tons of aggregate materials to build.
- Beginning in the 1950s, the Federal Highway Administration began working with the states to build the 42,800-mile Interstate Highway system in 49 states, plus additional roads in Alaska, the District of Columbia and Puerto Rico.
- The United States has 3.9 million miles of roadway, of which 3.1 million miles are rural roads. The Interstate System accounts for only 1.2% of the total mileage of roads, but carries 22.8% of total travel.
- Indiana’s road transportation system encompasses more than 93,000 miles of federal, state and county roads.