Almaden Valley (Spanish: Valle de Almadén), commonly known simply as Almaden (Spanish: Almadén), is a valley and neighborhood of San Jose, California, located in South San Jose. It is nestled between the Santa Cruz Mountains to the west and the Santa Teresa Hills to the east. Almaden, named after the ancient Spanish mining town of Almadén, traces its history back to the 1820s, when Mexican miners discovered mercury deposits on Rancho Los Capitancillos, which later led to the establishment of the New Almaden mines. Almaden Valley, known for its abundant parkland, is one of the most expensive neighborhoods to live in San Jose and is consistently ranked as one of the most expensive areas in the country. History Almaden was originally inhabited by the Tamien nation of Ohlone people, prior to the arrival of the Spanish. The Ohlone had long utilized the area for its cinnabar, which they used for paint production. During the Mexican era, the area of what is now Almaden was divided between two rancho grants: Rancho San Vicente, granted to José de los Reyes Berryessa, and Rancho Los Capitancillos, granted to Justo Larios. Rancho Cañada de los Capitancillos and Rancho Cañada de Oro were later divided from these original ranchos. Nueva Almadén Almaden Valley's origins go back to the early 1800s in what is now its southernmost neighborhood, known as New Almaden (Spanish: Nueva Almadén). In the 1820s, there were several attempts by local Californio officials from the Pueblo of San José to mine the area for silver, including an 1824 venture led by Don Antonio Suñol, a prominent local figure, and Luis Chaboya, of Rancho Yerba Buena. Quicksilver (mercury) was only successfully identified in 1845, by Mexican cavalry captain Andrés Castillero, who was able to obtain a grant to mine the area by Governor Pío Pico. However, occupied with his military responsibilities, Castillero sold his claim to the mines to Alexander Forbes, then serving as the British Consul to Mexican California. The area was named after the ancient Spanish mining town of Almadén, where mercury has been mined since Roman times. Mercury was extracted from the New Almaden mines from the time of the California Gold Rush until 1975. Many of the names in Almaden retain their mercury mine themes, such as Silver Lode Lane and Silver Mine Drive. Many places in Almaden still use the name Quicksilver. Post-conquest Era Following the American Conquest of