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Cemex’s Amended Reclamation Plan

Welcome to Clayton Quarry

The Clayton Quarry has been part of your community for over 70 years and we are pleased to announce some exciting changes. With our neighbors in mind, CEMEX has taken measurable steps to mitigate dust and track-out, and has introduced a plan that details how the quarry will be restored to open space that features a quarry lake.

We hope you find this website informative and that it engages the public in what is rightfully a public process. We look forward to hearing from you.

Before and After

The quarry is operating under a predecessor’s reclamation plan and will continue to do so unless CEMEX’s reclamation plan is approved by the Contra Costa County Board of Supervisors.  CEMEX’s proposed reclamation plan meets all modern standards for reclamation, many of which were not applicable at the time the original plan was adopted in 1983.

Do you prefer Lone Star’s Plan (A) or CEMEX’s Plan (B):



For Our Neighbors


CEMEX is committed to being a good community partner and implementing responsible environmental and business practices to reduce dust and track-out on Mitchell Canyon Road.

We are pleased to introduce a new plan that includes upgraded operational equipment, new landscaping and beautification of the site entrance to further improve our neighborhood compatibility.

Reduce Track-Out

Reduce Dust

New Landscaping