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The Permanente Quarry is a limestone quarry in an unincorporated area of Santa Clara County, California, just west of Cupertino, California. The quarry is a limestone and aggregate mining operation and cement plant, owned by Lehigh Southwest Cement, a subsidiary of Heidelberg Cement. Since 1939 the plant has been in operation and is responsible for the production of more than half of the cement used in the Bay Area. Roughly 70 percent of the cement used in the communities of Santa Clara County is acquired from the cement plant.

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  • Permanente Quarry (en)
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  • The Permanente Quarry is a limestone quarry in an unincorporated area of Santa Clara County, California, just west of Cupertino, California. The quarry is a limestone and aggregate mining operation and cement plant, owned by Lehigh Southwest Cement, a subsidiary of Heidelberg Cement. Since 1939 the plant has been in operation and is responsible for the production of more than half of the cement used in the Bay Area. Roughly 70 percent of the cement used in the communities of Santa Clara County is acquired from the cement plant. (en)
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  • http://commons.wikimedia.org/wiki/Special:FilePath/Hanson_Permanente_quarry.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Natural_%22Permanente_Ridge%22_buried_by_waste_material_by_Lehigh_Southwest_Quarry_2012-07.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Permanente_Quarry_aerial.jpg
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  • 37.319627 -122.113552
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  • The Permanente Quarry is a limestone quarry in an unincorporated area of Santa Clara County, California, just west of Cupertino, California. The quarry is a limestone and aggregate mining operation and cement plant, owned by Lehigh Southwest Cement, a subsidiary of Heidelberg Cement. Since 1939 the plant has been in operation and is responsible for the production of more than half of the cement used in the Bay Area. Roughly 70 percent of the cement used in the communities of Santa Clara County is acquired from the cement plant. Located in the foothills above Cupertino on the northeast slopes of Black Mountain, the quarry runs east-west parallel to the upper watershed of Permanente Creek to the south and to Permanente Ridge and Rancho San Antonio Open Space Preserve to the north. The limestone rock found in the Permanente Creek valley and on the summit of Black Mountain is relatively unique in the Bay Area. Microfossils in the limestone deposits suggest that the mountain originated as a seamount at 22 degrees north in the tropical Pacific about 100 million years ago and was transported to Los Altos by the Pacific Plate. These rocks occur as jagged gray boulders and outcrops just southwest of the radio towers on the summit of Black Mountain, as well as in the Permanente Quarry. (en)
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  • POINT(-122.11354827881 37.319625854492)
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