CONSTRUCTION AGGREGATES are the sand, gravel and crushed rock used to build our local community, and strengthen our economy.

Construction Aggregates are the second most consumed commodity in the world, after water!  They represent the basic building blocks of society supporting our transportation and industrial infrastructure, as well as the commercial, housing, education and government sectors of the economy.

 
Housing

Housing

Transportation Systems

Transportation Systems

Retaining Walls

Retaining Walls

Learn more about CONSTRUCTION AGGREGATES.


 

Ton for ton, humans use more CONCRETE today than steel, wood, plastics and aluminum combined!

 
Building Exteriors

Building Exteriors

Concrete Block Walls

Concrete Block Walls

Drainage Gutters

Drainage Gutters


Construction aggregates are the main ingredient in concrete.

 
41% Crushed Rock

41% Crushed Rock

26% Sand

26% Sand

16% Water

16% Water

11% Cement

11% Cement

6% Air

6% Air

 

The construction aggregates used in concrete provide the strength needed to ensure our infrastructure (e.g., roads, buildings, homes, etc.) are safe and functional.

Learn more about how concrete is made.


90 percent of our local streets and roads are paved with asphalt, a product consisting of 5% bitumen and 95% construction aggregates.

Asphalt (aka "black top") Playground

Asphalt (aka "black top") Playground

Asphalt Roadways

Asphalt Roadways

Bicycle Paths

Bicycle Paths

Learn more about how asphalt is made.


Construction aggregates are also used as rail road ballast, the base under roads, and to support utilities or other infrastructure. 

Rail Road Ballast

Rail Road Ballast

Water System

Water System


How is construction aggregate made?

Construction aggregates are produced from the crushing of hard rocks at quarries or mines.  The rock is extracted from the ground and put through various crushers and sifted through screens to separate the products into various sizes.  Each aggregate product is classified by the size of rock. 

It is important that construction aggregate resources are produced locally in order to keep the cost of transportation low and minimize the green house gas emissions associated with delivering the material long distances.

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Learn more about how aggregates are made.


How much aggregate do we consume?

The amount of aggregate we need is driven by population and the pace of economic activity.  As a region's population grows, so does the need for more roads, buildings, utilities and infrastructure to maintain its residents' quality of life.

 

In 2005, production of construction aggregates from Western Riverside County's 9 quarries peaked at 15.7 million tons. Of those quarries, 8 are located in the local area.

View map of local quarries →

Construction Aggregate Production in Western Riverside County (in Tons)

 

Graph Source: California Geological Survey. "Update of Mineral Land Classification for Portland Cement Concrete-Grade Aggregate in the Temescal Valley Production Area, Riverside County, California." Special Report 231. 2014.

By 2012, production fell by nearly 40% to 9.5 million tons as the Great Recession took its toll on the mining industry.  Experts believe the expanding economy will result in an increase in demand for construction aggregates.

Comparing regional needs to available reserves and resources demonstrates the aggregate resource issues confronting the Temescal Valley Production Area. These includes the need to plan carefully for the use of lands containing these resources and the need to consider the permitting of additional aggregate resources." - Special Report 231, California Geological Survey, 2014.