Permanente Quarry, Limestone quarry in Santa Clara County, California
Located on the northeast slopes of Black Mountain, this 3,510-acre quarry site contains limestone deposits formed from ancient seamounts 100 million years ago.
The site began as a small mining operation in 1902 before Henry Kaiser purchased it in 1939 to supply cement for the construction of Shasta Dam.
The quarry provided materials for major infrastructure projects across Northern California, including highways, dams, and San Jose International Airport throughout the 20th century.
The Santa Clara County Board of Supervisors approved plans in 2023 to transform sections of the former industrial site into open space and housing.
During World War II, this facility employed 2,000 workers and supplied all cement used by the Navy throughout the Pacific Theater operations.
GPS coordinates: 37.31890,-122.11110
Latest update: March 3, 2025 15:33
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