New Almaden Mine (New Almaden Mines), Almaden Quicksilver County Park, New Almaden, New Almaden District, Santa Cruz Mts, Santa Clara Co., California, USA
|Latitude & Longitude (WGS84):||37° 10' 37'' North , 121° 50' 20'' West|
|Latitude & Longitude (decimal):||37.17694,-121.83889|
|Köppen climate type:||Csb : Warm-summer Mediterranean climate|
A former Hg mine complex located in secs. 2 & 3, T9S, R1E, and in secs. 29 & 33, T8S, R1E, MDM, 100 feet E of New Almaden and about 12½ miles SSE of San Jose. Discovered in 1824 by Antonio Suñol and Louis Chaboya.
Mineralization is a Hg deposit hosted in siliceous dolomite.
Production for the group was more than 1,000,000 flasks of Hg, most from this mine.
16 valid minerals. 1 (FRL) - first recorded locality of unapproved mineral/variety/etc.
This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.
Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org
|Cretaceous - Jurassic|
66 - 201.3 Ma
|Franciscan Complex, unit 1 (Coast Ranges)|
Age: Mesozoic (66 - 201.3 Ma)
Stratigraphic Name: Franciscan Complex; Dothan Formation; Honda Formation; San Luis Formation; Valentine Spring Formation
Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. 
174.1 - 201.3 Ma
|Franciscan Complex Central Belt, Basaltic volcanic rocks of Marin Headlands terrane|
Age: Early Jurassic (174.1 - 201.3 Ma)
Description: Basaltic flows, massive to pillowed, locally vesicular, with minor tuff and pillow breccia. Geochemistry suggests a mid-ocean ridge (MORB) or an off-ridge origin. Age is late Early Jurassic (Pliensbachian) or older, based on age of overlying radiolarian cherts.
Comments: New Almaden Block
Reference: Wentworth, C.M., M.C. Blake Jr., R.J. McLaughlin, R.W. Graymer. Preliminary Geologic Map of the San Jose 30 X 60 Minute Quadrangle, California. U.S. Geological Survey Open-File Report 98-795.