The New Almaden Mine Collection (Bulmore) contains documents dating from 1850 to 1976. The materials, measuring 15.5 linear
feet are housed in 18 boxes and are arranged in 8 series: Administrative, Miners and Miners' Fund, Ledgers, Printed Materials,
Research Files and Clippings, Ephemera, Maps and Drawings, and Photographs. The bulk of the documents cover the period of
the late 1800's.
In 1845, Captain Andres Castillero of the Mexican Army was sent on a routine scouting patrol through what is now northern
California, then part of Mexican territory. As an amateur geologist, Castillero recognized the possibility that the rolling
hills held vast mineral deposits. During a visit to local Ohlone indians, his suspicions were confirmed. The Ohlones told
him of the red rock they used to make paint, and of the cave where the walls were solid deposits of this red rock. A trip
to the cave left Castillero amazed; the red rock was cinnabar, high grade mercury ore. He quickly filed a claim with the most
suitable local authority, a justice of the peace, and received mineral rights to excavate the mine site. The rights were divided
among five principal holders, including Castillero, his guide, and the Ohlones who led him to the mine.
15.5 linear feet
History San José can only claim physical ownership of the collection. Users are responsible for satisfying any claims of the
copyright holder. Permission to copy or publish any portion of History San José's collection must be given by History San
The collection is open for research.