Santa Clara County
Plate 30. Permanente Limestone - Limestone starts the mile-long journey, by way of conveyor belt, from the Permanente Cement Company quarry, Santa Clara County, to the processing plant. Buggies like the one pictured above are 25-yard capacity. The plant uses more than 4 miles of conveyor belting by which rock moves downhill at the rate of 1000 tons per hour
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