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Guadalupe Mine, New Almaden, New Almaden Mining District, Santa Cruz Mountains, Santa Clara Co., California, USAi
Regional Level Types
Guadalupe MineMine
New Almaden- not defined -
New Almaden Mining DistrictMining District
Santa Cruz MountainsMountain Range
Santa Clara Co.County
CaliforniaState
USACountry

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Key
Latitude & Longitude (WGS84):
37° 12' 37'' North , 121° 53' 56'' West
Latitude & Longitude (decimal):
Locality type:
Nearest Settlements:
PlacePopulationDistance
Cambrian Park3,282 (2018)5.9km
Los Gatos30,705 (2017)6.9km
Lexington Hills2,421 (2011)8.3km
Monte Sereno3,556 (2017)8.8km
Communications Hill11,267 (2019)9.6km


A former Hg occurrence/mine located about 7.4 km WNW of New Almaden and about 7 miles SW of San Jose, along the E side of Guadalupe Creek, on private land (fee ownership). Discovered in 1846 by Josiah Belden. Owned by James Rolfe, III (1957). Owned by the Guadalupe Rubbish Disposal Inc. (95%), California (1982) and by Rancho de Guadalupe Inc. (5%), California (1982). Owned by the Laco Mining Co. Produced during the periods 1854 to 1886, 1901 to 1906, 1908 to 1918, 1935 to 1937, and 1943 to 1947. MRDS database stated accuracy for this location is 10 meters.

Mineralization is hosted in Late Cretaceous serpentinite. The ore body is irregular, strikes N55W and dips 35SW at a thickness of 12.19 meters, a depth-to-top of 100 meters, a depth-to-bottom of 304.8 meters a width of 107 meters and a length of 45.72 & 137 meters. Ore body No. 1 is an irregular replacement body . Ore body No. 2 is tabular in a fissure vein . The primary mode of origin was hydrothermal activity. Primary ore control was lithology and the secondary control was fracturing. Local alteration includes silica carbonate alteration of serpentine. Local rocks include rocks of the Franciscan Complex, unit 1 (Coast Ranges).

Local geologic structures include a serpentine-sediment contact, shearing and folding.

Workings include surface and underground openings with a length of 8,046.5 meters. Underground workings at a length of 9,144.01 meters . 5 main shafts, more than a dozen stopes, several thousand square feet of open pits in a little more than a quarter of a square mile. The mine is divided into 2 parts, an older group of underground workings south of Guadalupe Creek known as the Old Mine, and the newer more scattered workings underlying Los Capitancillos Ridge N of the creek. The underground openings are inaccessible. Named workings include the Good Friday shaft, McGurk tunnel, Old Hill mine pits, Canyon tunnels, Caplan tunnel, Moreno tunnel, Upper and Lower water tunnels, Hicks tunnel, New Guadalupe inclined shaft, Office Mine pit, Old inclined shaft, Engine shaft, Virginia shaft, Maryland #1 shaft, Maryland No. 2 shaft, and an air shaft on the S side of the hilltop. North of the hill are the Kelly cuts, Upper Kelley workings, and New Prospect tunnels. At the east end of the hilltop, but still west of Senator Mine, are the East Hilltop workings.

Production data are found in: U.S. Bureau of Mines file data; Bailey & Everhart; and Holmes.

Production statistics: Year: 1874 (period = 1846-1874): 20,000 flasks Hg (estimate). Year: 1947 (period = to 1947): Hg (estimate) ^2 to 5% Hg (1,581 grams/metric ton. Year: 1947 (period = 1875-1947): 92,623 flasks Hg produced. Defense Minerals Exploration Administration (DMEA) report indicates about 115,000 flasks produced.

Reserves data: Estimated reserves of 2,000 tons of 5% ore. 1942 direct exploration with help of the U.S. Bureau of Mines, found moderate tonnage of low-grade ore; 1957 Direct exploration by the DMEA, found some ore.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


16 valid minerals.

Rock Types Recorded

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!

Select Rock List Type

Alphabetical List Tree Diagram

Detailed Mineral List:

Azurite
Formula: Cu3(CO3)2(OH)2
Reference: Kunz, George Frederick (1905a), Gems, jewelers’ materials, and ornamental stones of California: California Division Mines Bulletin 37, 171 pp.: 107; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 94.
Bornite
Formula: Cu5FeS4
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10040741.
Calcite
Formula: CaCO3
Reference: Rocks & Minerals (1948): 23: 797.; Kunz, George Frederick (1905a), Gems, jewelers’ materials, and ornamental stones of California: California Division Mines Bulletin 37, 171 pp.: 107; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 94, 253.
Chalcopyrite
Formula: CuFeS2
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10040741.
Cinnabar
Formula: HgS
Description: Crystallized
Reference: Rocks & Minerals (1944): 19: 346-347.; Kunz, George Frederick (1905a), Gems, jewelers’ materials, and ornamental stones of California: California Division Mines Bulletin 37, 171 pp.: 107; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 94, 253, 367.
Dolomite
Formula: CaMg(CO3)2
Reference: Rocks & Minerals (1944): 19: 346-347; Rocks & Minerals (1948): 23: 797.; U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Galena
Formula: PbS
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10040741.
Malachite
Formula: Cu2(CO3)(OH)2
Reference: Kunz, George Frederick (1905a), Gems, jewelers’ materials, and ornamental stones of California: California Division Mines Bulletin 37, 171 pp.: 107; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 253.
Mercury
Formula: Hg
Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Metacinnabar
Formula: HgS
Reference: Melville, William Harlow (1890), Metacinnabarite from New Almaden, California: American Journal of Science, 3rd. series: 40: 292; Melville, William Harlow (1891), Metacinnabarite from New Almaden, California: USGS Bulletin 78: 80-83; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 263.
Opal
Formula: SiO2 · nH2O
Reference: Rocks & Minerals (1944): 19: 346-347.
Pyrite
Formula: FeS2
Reference: Rocks & Minerals (1944): 19: 346-347.; U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Quartz
Formula: SiO2
Reference: Rocks & Minerals (1944): 19: 346-347.; U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Quartz var: Chalcedony
Formula: SiO2
Reference: Rocks & Minerals (1944): 19: 346-347; Rocks & Minerals (1948): 23: 797.
'Serpentine Subgroup'
Formula: D3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10040741.
Sphalerite
Formula: ZnS
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10040741.
Stibnite
Formula: Sb2S3
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10040741.
Tiemannite
Formula: HgSe
Reference: Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 367.

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Mercury1.AD.05Hg
Group 2 - Sulphides and Sulfosalts
Bornite2.BA.15Cu5FeS4
Chalcopyrite2.CB.10aCuFeS2
Cinnabar2.CD.15aHgS
Galena2.CD.10PbS
Metacinnabar2.CB.05aHgS
Pyrite2.EB.05aFeS2
Sphalerite2.CB.05aZnS
Stibnite2.DB.05Sb2S3
Tiemannite2.CB.05aHgSe
Group 4 - Oxides and Hydroxides
Opal4.DA.10SiO2 · nH2O
Quartz4.DA.05SiO2
var: Chalcedony4.DA.05SiO2
Group 5 - Nitrates and Carbonates
Azurite5.BA.05Cu3(CO3)2(OH)2
Calcite5.AB.05CaCO3
Dolomite5.AB.10CaMg(CO3)2
Malachite5.BA.10Cu2(CO3)(OH)2
Unclassified Minerals, Rocks, etc.
'Serpentine Subgroup'-D3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Mercury1.1.7.1Hg
Group 2 - SULFIDES
AmBnXp, with (m+n):p = 3:2
Bornite2.5.2.1Cu5FeS4
AmXp, with m:p = 1:1
Cinnabar2.8.14.1HgS
Galena2.8.1.1PbS
Metacinnabar2.8.2.3HgS
Sphalerite2.8.2.1ZnS
Tiemannite2.8.2.4HgSe
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
AmBnXp, with (m+n):p = 2:3
Stibnite2.11.2.1Sb2S3
AmBnXp, with (m+n):p = 1:2
Pyrite2.12.1.1FeS2
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
AB(XO3)2
Dolomite14.2.1.1CaMg(CO3)2
Group 16a - ANHYDROUS CARBONATES CONTAINING HYDROXYL OR HALOGEN
Azurite16a.2.1.1Cu3(CO3)2(OH)2
Malachite16a.3.1.1Cu2(CO3)(OH)2
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Si Tetrahedral Frameworks - SiO2 with H2O and organics
Opal75.2.1.1SiO2 · nH2O
Unclassified Minerals, Mixtures, etc.
Quartz
var: Chalcedony
-SiO2
'Serpentine Subgroup'-D3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn

List of minerals for each chemical element

HHydrogen
H OpalSiO2 · nH2O
H AzuriteCu3(CO3)2(OH)2
H MalachiteCu2(CO3)(OH)2
H Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
CCarbon
C CalciteCaCO3
C DolomiteCaMg(CO3)2
C AzuriteCu3(CO3)2(OH)2
C MalachiteCu2(CO3)(OH)2
OOxygen
O CalciteCaCO3
O DolomiteCaMg(CO3)2
O Quartz (var: Chalcedony)SiO2
O OpalSiO2 · nH2O
O QuartzSiO2
O AzuriteCu3(CO3)2(OH)2
O MalachiteCu2(CO3)(OH)2
O Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
MgMagnesium
Mg DolomiteCaMg(CO3)2
Mg Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
AlAluminium
Al Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
SiSilicon
Si Quartz (var: Chalcedony)SiO2
Si OpalSiO2 · nH2O
Si QuartzSiO2
Si Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
SSulfur
S CinnabarHgS
S PyriteFeS2
S MetacinnabarHgS
S BorniteCu5FeS4
S ChalcopyriteCuFeS2
S GalenaPbS
S SphaleriteZnS
S StibniteSb2S3
CaCalcium
Ca CalciteCaCO3
Ca DolomiteCaMg(CO3)2
MnManganese
Mn Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
FeIron
Fe PyriteFeS2
Fe BorniteCu5FeS4
Fe ChalcopyriteCuFeS2
Fe Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
NiNickel
Ni Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
CuCopper
Cu AzuriteCu3(CO3)2(OH)2
Cu MalachiteCu2(CO3)(OH)2
Cu BorniteCu5FeS4
Cu ChalcopyriteCuFeS2
ZnZinc
Zn SphaleriteZnS
Zn Serpentine SubgroupD3[Si2O5](OH)4 D = Mg, Fe, Ni, Mn, Al, Zn
SeSelenium
Se TiemanniteHgSe
SbAntimony
Sb StibniteSb2S3
HgMercury
Hg CinnabarHgS
Hg MercuryHg
Hg MetacinnabarHgS
Hg TiemanniteHgSe
PbLead
Pb GalenaPbS

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A) In-text Citation No.
Irelan, William, Jr. (1888b), Eighth annual report of the State Mineralogist for the year ending October 1, 1888, California Mining Bureau. (Report 8), 946 pp.: 543-550.
Melville, William Harlow (1890), Metacinnabarite from New Almaden, California: American Journal of Science, 3rd. series: 40: 292.
Melville, William Harlow (1891), Metacinnabarite from New Almaden, California: USGS Bulletin 78: 80-83.
Kunz, George Frederick (1905a), Gems, jewelers’ materials, and ornamental stones of California: California Division Mines Bulletin 37, 171 pp.: 107.
Fortsner, William (1908), Quicksilver Resources of California: California Division of Mines and Geology Bulletin 27, 270 p.
Bradley, W.W. (1918), Quicksilver resources of California, with a section on metallurgy and ore dressing: California Mining Bureau. Bulletin 78, 389 pp.
Huguenin, Emile & W.O. Castello (1921), Santa Clara County: California Journal of Mines and Geology; California Mining Bureau. (Report 17): 17: 180-227.
Franke, Herbert A. (1930), Santa Clara, Nevada, Kings, Tulare Counties: California Mining Bureau. Report 26: 26-33.
Ransome, Alfred Leslie & J.L. Kellogg (1939), Quicksilver resources of California: California Division Mines Report 35: 353-486.
Sayers, R. R. (1942), Guadalupe Mercury Mine, U.S. Bureau of Mines, War Materials Report 14.
Sayers, R. R. (1943), Guadalupe Mine, Santa Clara County, California, U.S. Bureau of Mines, War Minerals Report 111.
Anonymous (1944), Guadalupe, Mining World: 34, 36.
Huttl, John B. (1944), Guadaloupe mercury mine has new treatment plant: Engineering & Mining Journal: 145: 86-87.
Rocks & Minerals (1944): 19: 346-347.
Rocks & Minerals (1948): 23: 797.
Bedford, R.H. and Ricker, S. (1950), Investigation of the Guadelupe Mercury Mine, Santa Clara County, California: U.S. Bureau of Mines Report of Investigation 4682, 9pp.
Davis, Fenelon Francis & C.W. Jennings (1954), Mines and mineral resources of Santa Clara County, California: California Journal of Mines and Geology: 50: 342-354.
Bailey, Edgar H. & Donald L. Everhart (1964), Geology and quicksilver deposits of the New Almaden district, Santa Clara County, California: USGS PP 360, 206pp.
Holmes, G.H. (1965) Mercury in California. US Bureau of Mines Information Circular 8252.
Davis, Fenelon Francis and E.H. Bailey (1966) Mercury. California Division Mines and Geology Bulletin 191.
Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 94, 253, 263, 367.
Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 111.
USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10040741.
U.S. Bureau of Mines Minerals Availability System/Mineral Industry Location System (MAS/MILS): file #0060850104.
Bailey, E.H., USGS, personal files.

Other Databases

USGS MRDS Record:10040741

Other Regions, Features and Areas containing this locality

North America
North America PlateTectonic Plate

This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.
 
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