The California Geological Survey (CGS) provides objective economic-geologic expertise to assist in the protection and development of mineral resources through the land-use planning process. This effort is mandated by the Surface Mining and Reclamation Act of 1975 (SMARA). The primary products are mineral land classification maps and reports. Local agencies are required to use the classification information when developing land-use plans and when making land-use decisions.
Aggregate Sustainability in California - Map Sheet 52, Updated 2018
This map and accompanying report provides general information about the current availability of California's permitted aggregate reserves. The map compares projected aggregate demand for the next 50 years with currently permitted aggregate reserves for more than 30 aggregate study areas throughout the state. The map also highlights regions where there are less than 10 years of permitted aggregate supply remaining.
View/download the Release Statement (PDF Document)
View/download the Map (4 MB PDF Document)
View/download the Report (PDF Document)
Mineral Lands Classification Guidelines and Petition Information
Download Guidelines for Classification and Designation Petitions (PDF Document)
Download Petition Form for Classification-Designation of Mineral Lands (PDF Document)
Send the Petition to:
The State Mining and Geology Board
Attn: Jeffrey Schmidt
801 K Street MS 20-15
Sacramento, CA 95814
Make Check payable to: The State Mining and Geology Board