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Permanente Quarry (Lehigh/Hanson)

Press Release

8/13/2019 - COUNTY BOOSTS OVERSIGHT CAPACTIY AT LEHIGH CEMENT PLANT AND QUARRY​

Informational E-mail Distribution List

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Overview

The Permanente Quarry (Lehigh) is a limestone and aggregate mining operation located in the unincorporated foothills of Santa Clara County, Cupertino. The Lehigh cement plant is an authorized use operating under Use Permit No. 173.023, issued May 8, 1939. The Lehigh-Permanente quarry is a “vested mine” operation, as determined by the Board of Supervisors on February 8, 2011. A “vested mine” is a mine that was established legally within the regulations in place at that time, and is allowed to continue until the use ceases. A Reclamation Plan, the document showing how the quarried lands will be restored, originally approved in 1984 and amended in 2012.

Government Agencies and Other Contacts

Lehigh Cement Plant and Permanente Quarry operate under several permits issued by the County, and other local, state and federal agencies. 

Frequently Asked Questions​​



Other Recent Questions:

  • "Can quarry blasting cause earthquakes?"

    Dr. Parrish, State Geologist states, “quarry blasting cannot cause an “earthquake.” Although the ground might “shake” or rumble as a nearby result of a blast, this is not a damaging tectonic earthquake, and these blasts do not contain enough energy to trigger a pre-existing fault to slip and generate an earthquake. Tectonic earthquakes in California generally occur at depths between five and eleven miles below the land surface – significantly deeper than a quarry blast at perhaps several hundred feet below the land surface. The energy released by a quarry blast is several million times less than that required to nucleate a fault to move and produce an earthquake. Earthquakes can be caused by human activity, and are labeled “induced” seismicity or “triggered” earthquakes. However, there has not been a recorded case of a quarry blast inducing or triggering an earthquake.” - John G. Parrish, Ph. D., PG, State Geologist, California Geological Survey

 


 

Lehigh Southwest Cement Plant

    Lehigh Southwest Cement Co. Process Water Treatment Plant

     


     

    Visit our Lehigh Archive for additional information regarding the Reclamation Plan, Vested Rights, and other topics related to the Lehigh/Permanente Quarry and Cement Plant.

     


     

    If you would like to be added to the Interested Parties List for future Lehigh Quarry informational e-mails, please fill out the form below.

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    Last updated: 11/27/2019 12:01 PM