New Almaden Quicksilver
operations in New Almaden first began in 1845 under the
claim of Mexican Cavalry Officer Captain Andres Castillero.
Castillero discovered cinnabar being used by the Ohlone
Indians contained mercury, which was needed to process
silver in Mexican Mines, as well as gold in California.
The mine became the world’s second largest producer of
mercury, also known as “quicksilver”. Santa Clara
County Parks and Recreation began purchasing
the old mine property in 1973. The area is now a park,
with a museum is located in the former mine manager’s
residence. Our extensive archives of mining operations
and area's history are also located here.
Our archives currently house materials of the 682nd Air
Force Station at at Mt. Umhunum.
Click here for archives