Named for Arthur R. Wilson, who founded Granite Rock Company on February 14, 1900, this quarry has been the heart of Granite Rock's business since the beginning. In more than a century of continuous operation, it endured the destruction of the Great San Francisco Earthquake of 1906, the economic devastation of the Great Depression, the challenges and opportunities of two World Wars, and periods of growth and modernization. Early mining operations were tough, with men using picks and shovels to mine rock that mule-drawn wagons hauled to the railroad siding for shipment. Hand labor was gradually replaced by steam shovels and crushers, and mule power gave way to a steam locomotive. Today the quarry uses a modern fleet of haul trucks and loaders, a giant mobile primary crusher, miles of electronic conveyors, and a computer-controlled screening, crushing, and washing plant to produce high-quality construction aggregates for concrete, asphalt, and other applications.