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Permanente Quarry (Lehigh/Hanson)

Press Release


Informational E-mail Distribution List

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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. To obtain more information, report a concern, or if you have any questions, please contact the following:

County Planning Mailing List

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Lehigh Community Meeting

Santa Clara County Supervisor Joe Simitian and the City of Cupertino conduct a public informational meeting to review and discuss the status of the various local, state and federal agency oversight and permits for the Lehigh Cement Plant and Quarry. Recorded March 2019 at the Cupertino Community Hall.

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.



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Last updated: 10/10/2019 10:20 AM