The total economic benefit of the Temescal Valley construction aggregates industry to the region can be measured by utilizing economic multipliers generated by the Bureau of Economic Analysis. The estimated annual average production in the region, between 1992 through 2012, is 11 million tons. This results in a direct economic impact of $113 million annually. After applying the BEA multipliers, the overall economic benefit to the region of just under $200 million annually.
The California Geological Survey (CGS) states that the Temescal Valley Production Area is an important source of construction aggregate, not only for Riverside County, but for parts of Los Angeles, Orange, San Bernardino, and San Diego counties. CGS states further that the Temescal Valley area will likely remain an important regional source of construction aggregate in the future.
The aggregate quarry operations in Temescal Valley are located in areas where CGS has classified land containing mineral resources suitable for infrastructure projects, i.e. MRZ-2.
The California Surface Mining and Reclamation Act of 1975 (SMARA) requires the State Geologist to classify land according to the presence or absence of significant mineral deposits in certain areas of the state.
An Aggregate Resource Area (ARA) is an area deemed available for mining based upon criteria for compatibility provided by the State Mining and Geology Board.