New Almaden, known in Spanish as Nueva Almadén, is a historic community and former mercury mine in the Capitancillos Hills of San Jose, California, located at the southwestern point of Almaden Valley in South San Jose. New Almaden is divided into two parts: the mines and much of their immediate surroundings, including historic ghost town settlements in the Capintancillas, which together form the Almaden Quicksilver County Park, and the largely residential historic district surrounding the Casa Grande. Discovered in the 1820s by Mexican settlers, New Almaden mines are the oldest mines in California and were one of the most productive mercury mines in the country. Long before the arrival of the Spanish, Mexicans, and Americans, the indigenous Ohlone people had long utilized the area for its cinnabar, which they used in paint production. History Cinnabar, bright red mercury ore, was used by the Ohlone people for paint, but the settlers soon saw its potential to produce quicksilver. Andres Castillero, a captain in the Mexican Army, obtained a grant to the mine in 1846 but, occupied with his military duties during the Mexican War, soon sold it to Barron, Forbes Company, an English textile firm based in Tepic, Mexico. It was named "Nueva Almaden" by Alexander Forbes. Castillero's mining claim was confirmed by the Board of Commissioners that evaluated private land claims in California on January 8, 1856, but there was continued litigation in the District court, The United States vs. Andres Castillero. A claim of fraud was made on behalf of the Quicksilver Mining Company, which had acquired a competing land claim originating in an agricultural claim to the land the mine was on. On appeal to the Supreme Court of the United States the claim was found invalid in a decision rendered March 10, 1863. One of the competing land claims was Rancho Los Capitancillos. The mine is named for a mercury mine in (old) Almadén, Spain, which had operated since at least Roman times. (See Heritage of Mercury. Almadén and Idrija.) The term Almadén, meaning "the mine", is derived from the Arabic language. In 1863, acting on information that title to the mine had not been proven, Abraham Lincoln attempted to seize the mine, but the federal agent and deputy federal marshal were met at the mine gates by armed miners. Mindful of the possibility of losing the loyalty of California during the Civil War, the federal government