Industrial Minerals and Resource Economics Section | Industrial Minerals and Resource Economics Staff
Aggregate Program
Illinois' aggregate resources occur in a wide variety of geological
settings, from limestone and dolomite bedrock units of differing age to
sand-and-gravel deposits formed in diverse river, beach, and glacial
settings. The aggregate program:
• inventories aggregate resources as part of the state's
geological mapping program
• provides service to Illinois' aggregate producers and the public
using the latest geological research and historical information
• characterizes and maps the availability and distribution of
limestone and dolomite resources suitable for pH control in agriculture
and for toxic emission control in coal-burning power plants
• investigates the feasibility of underground mining and the
secondary use of mined-out space
• maintains a database of existing and abandoned pits and
quarries
• provides mineralogical and geochemical information
• assists producers in better utilization of existing resources
and locating new sources
• maintains a repository of data for characterization of Illinois
aggregate resources for present and future exploration
• compiles information about Illinois mineral production and value
and assists industry and the public in estimating reserves and value.
The aggregate program inventories these resources. Construction aggregates have low unit values per ton, but large tonnages of the material are needed for most construction purposes. To be economically viable aggregate resources need to be available locally because the cost of aggregate goes up significantly as the distance the material is transport increases Industrial Minerals in Illinois: A Key to Growth (456K PDF file). Not all aggregates have the suitable quality to meet engineering specifications for use in construction or other purposes because a small amount of impurities can significantly alter aggregate quality. Consequently, aggregates must pass the Illinois Department of Transportation's stringent tests before they may be used to build state roads.
Updated 12/9/2009 SLD