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Mount Diablo - Round Valley
  Lands > Land Use > Concord Naval Weapons Station  
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Major Current Projects

· CEMEX Quarry
· Communication Towers
· Concord Naval Weapons Station
· James Donlon Extension
· Magee Ranch
· Measure F in Brentwood
· Pittsburg Grading Project
· Pittsburg Hills Annexation
· Tassajara Valley
· Threat to the Subdivision Map Act
· Recent Successes

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CEMEX Quarry

The CEMEX Quarry just south of Clayton and right next to Mitchell Canyon, on Mount Diablo’s north side, wants to change the permit that will determine what will happen with the quarry once mining ends. They’re proposing to excavate 200 ft. deeper into the quarry, and after mining ends let the quarry fill with water to create a 450 ft. – deep “lake”.

Save Mount Diablo is concerned because the quarry lies right next to Mount Diablo State Park, popular hiking trails, the important Mitchell Creek wildlife corridor, and rare wildlife habitat. Trucks are also sources of pollution and emit greenhouse gases. Neighbors are also concerned about the dust and noise from the quarry, and the road and traffic impacts caused by large trucks entering and leaving the area. No matter what happens, we want a high quality environmental review of the potential impacts of this project and how those impacts can be reduced.

The Contra Costa County Board of Supervisors will decide the fate of CEMEX’s proposal. You can contact them (phone and email below) to share your thoughts, concerns and ideas on how CEMEX can reduce impacts.

Gary Kupp (, 925-674-779), the County Planner for the project, can answer technical questions and add you to the contact list so you can receive updates. 

Download the Save Mount Diablo Fact Sheet on CEMEX Quarry Proposed Reclamation Plan Amendment.

  Credits | Legal StatementCopyright 2012 Save Mount Diablo. Designed by Alison Martin. Funded by Clif Bar.