CEMEX Rockfield Expansion Project
Background
The CEMEX Rockfield Project includes two sites: the Quarry, located south of Lost Lake Park, and the Plant, located just south of Ball Ranch. Mining at the Quarry started in 1913.
A hole deep enough to fit this 43 story, 600 ft tall high rise is proposed for the San Joaquin River bottom. Photo Credit: Nicolas Janberg. Image accessed from Structurae .
Project Summary
The expansion includes the following changes:
- Extension of mining for 100 years.
- Change in technique from mechanical (digging) of sand and gravel to blasting hard rock and crushing it into gravel.
- Increase in depth of mine to 600 feet below ground surface (BGS)
For context as to the scale of 600 feet, we identified the San Francisco high rise depicted here. Located at 50 Fremont Center, the building reaches 43 stories into the San Francisco skyline and is 600 feet tall. If the CEMEX Rockfield Expansion Project moves forward, a hole deep enough to fit the entirety of 50 Fremont Center will scar the San Joaquin River bottom.
CEMEX Project Documents
What You Can Do Now
The official 45-day public comment period for the DEIR ended on March 10, 2025. During this period, the public had the opportunity to review the DEIR and its technical appendices and provide comments on the project's environmental impacts.
While the County is not required to respond to comments received after the deadline, you can still submit your concerns about the project to the County. Additional concerns will continue strengthening opposition to the project and demonstrate ongoing public concern.
In addition to submitting comments to Tawanda Mtunga (info included below), you can share your concerns with the Fresno County Board of Supervisors. Information about the Fresno County Board is available here.
How to Submit a Comment Letter
Email to:
tmtunga@fresnocountyca.gov
Mail to:
Tawanda Mtunga, Principal Planner
Fresno County Public Works & Planning Department Development Services & Capital Projects Division
2220 Tulare St., 6th Floor
Fresno, CA 93721
Agency Comment Letters
San Joaquin River Parkway and Conservation Trust
Full Letter:
San Joaquin River Parkway and Conservation Trust (File Size: 10 MB)
*Attachments submitted with the Trust's letter:
CBEC Ref 1 - Barlow Streamflow Depletion
CBEC Ref 2 - CDWR Depletions of ISW
CBEC Ref 3 - Central Valley Flood Protection Plan
Upcoming CEMEX Strategy Meeting
Please continue to check this webpage for information and updates on ways you can get involved and future CEMEX strategy meetings.
What's Next?
Fresno County staff and project consultants are currently reviewing and preparing responses to the hundreds of public comments received on the Draft EIR. This process takes an indeterminant amount of time before the final documents are ready for hearing.
Once the final EIR is complete, Fresno County will provide notice of a public hearing before the County Planning Commission, where the public will again have an opportunity to comment on the project. The Trust is following this process closely and will continue sharing information as it becomes available.
Your donation will directly support the Trust's work to oppose the project and advocate for protecting the San Joaquin River's wildlife, water quality, ecosystems, and recreational resources for generations to come.
Previous Communications
Click on the links below to read the River Parkway Trust’s email communication regarding the CEMEX project.
July 12, 2023
April 4, 2025
July 21, 2023
March 5, 2025
July 2, 2020
January 17, 2025
June 24, 2020
Media
There have been a number of news articles about CEMEX over the past few years.