New Almaden Mining District, Santa Clara County, California, USAi
| Regional Level Types | |
|---|---|
| New Almaden Mining District | Mining District |
| Santa Clara County | County |
| California | State |
| USA | Country |
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Latitude & Longitude (WGS84):
37° 10' 36'' North , 121° 50' 44'' West
Latitude & Longitude (decimal):
Type:
Köppen climate type:
Mindat Locality ID:
25791
Long-form identifier:
mindat:1:2:25791:1
GUID (UUID V4):
eb270392-d119-4f71-a5de-f24a67d823d1
A former Hg mining area located in secs. 2 & 3, T9S, R1E, and in secs. 29 & 33, T8S, R1E, MDM, about 12½ miles SSE of San Jose in West-central Santa Clara County. Discovered in 1824 by Antonio Suñol and Louis Chaboya, who mistook native Hg for Ag ore. Land is now owned by the county. Virtually synonymous with the New Almaden Mines, which constitute the bulk of the mining activities in the district.
Local alteration include silica carbonate alteration of serpentine. Local rocks include rocks of the Franciscan Complex, unit 1 (Coast Ranges).
Regional geologic structures include a dominant NW trend and N dip. Local
Local structures include tension fractures and sediment-serpentine contacts. Controls for ore emplacement included the alteration and the tension fractures.
Production statistics: Year: 1964 (period = 1845-1945): 1,137,727 flasks of Hg at 74 pounds/flask were produced (accurate).
Mines: District record includes the mines discussed in Bailey and Everhart's PP-360: New Almaden, America, Providencia, Enriquita, San Antoniao, and San Mateo. The "district" would also include the Guadalupe, Senator, Santa Teresa, and Bernal Mines, however these are likely not of the same deposit.
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Standard Detailed Gallery Strunz Chemical ElementsCommodity List
This is a list of exploitable or exploited mineral commodities recorded from this region.Mineral List
Mineral list contains entries from the region specified including sub-localities30 valid minerals. 1 (FRL) - first recorded locality of unapproved mineral/variety/etc.
Rock Types Recorded
Note: data is currently VERY limited. Please bear with us while we work towards adding this information!
Rock list contains entries from the region specified including sub-localities
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Alphabetical List Tree DiagramDetailed Mineral List:
| ⓘ 'Apophyllite Group' Formula: AB4[Si8O22]X · 8H2O Description: Well-developed crystals line crevices in rock. |
| ⓘ Aragonite Formula: CaCO3 Description: Occurs sparingly in the area. References: |
| ⓘ 'Aragotite' (FRL) Formula: (C,H) Type Locality: Description: Impregnates siliceous dolomite. |
| ⓘ Arsenopyrite Formula: FeAsS Description: Minor amounts occur in Hg ore. Bailey & Everhart question this occurrence. |
| ⓘ Azurite Formula: Cu3(CO3)2(OH)2 |
| ⓘ Baryte ? Formula: BaSO4 Description: Reported. |
| ⓘ Bavenite Formula: Ca4Be2Al2Si9O26(OH)2 Description: Reported as "Pilinite." References: |
| ⓘ Bornite Formula: Cu5FeS4 Localities: |
| ⓘ Calcite Formula: CaCO3 Localities: Guadalupe Mine, New Almaden, New Almaden Mining District, Santa Clara County, California, USA North Randol Mine, New Almaden, New Almaden Mining District, Santa Clara County, California, USA San Pedro-Almaden Area Mine (New Almaden - San Pedro-Almaden Area), New Almaden, New Almaden Mining District, Santa Clara County, California, USA New Almaden Mine (New Almaden Mines), New Almaden, New Almaden Mining District, Santa Clara County, California, USA References: |
| ⓘ Chalcopyrite Formula: CuFeS2 Localities: |
| ⓘ Chromite Formula: Fe2+Cr3+2O4 |
| ⓘ Chrysocolla Formula: Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 Locality: Santa Margarita Mine, New Almaden, New Almaden Mining District, Santa Clara County, California, USA Description: Occurs as pseudomorphs after cuprite. |
| ⓘ Cinnabar Formula: HgS Localities: Reported from at least 24 localities in this region. |
| ⓘ Dolomite Formula: CaMg(CO3)2 Localities: Reported from at least 8 localities in this region. |
| ⓘ Epsomite Formula: MgSO4 · 7H2O Description: Abundant on mine walls as a post-mining product. |
| ⓘ Fluorite Formula: CaF2 Colour: White Description: Occurs as crystals. |
| ⓘ Galena Formula: PbS Localities: Description: A little occurs in ores. |
| ⓘ Glaucophane Formula: ◻[Na2][Mg3Al2]Si8O22(OH)2 Description: Occurs as glaucophane schist. |
| ⓘ Gyrolite Formula: NaCa16Si23AlO60(OH)8 · 14H2O |
| ⓘ Jarosite Formula: KFe3+3(SO4)2(OH)6 |
| ⓘ Malachite Formula: Cu2(CO3)(OH)2 |
| ⓘ Mercury Formula: Hg Localities: Reported from at least 6 localities in this region. |
| ⓘ Metacinnabar Formula: HgS Localities: References: |
| ⓘ Millerite Formula: NiS Description: Occurs in Hg ores. |
| ⓘ Opal Formula: SiO2 · nH2O Localities: References: |
| ⓘ 'Petroleum var. Bitumen' |
| ⓘ Pyrite Formula: FeS2 Localities: Guadalupe Mine, New Almaden, New Almaden Mining District, Santa Clara County, California, USA San Mateo Mine, New Almaden, New Almaden Mining District, Santa Clara County, California, USA New Almaden Mine (New Almaden Mines), New Almaden, New Almaden Mining District, Santa Clara County, California, USA |
| ⓘ Quartz Formula: SiO2 Localities: Reported from at least 9 localities in this region. |
| ⓘ Quartz var. Chalcedony Formula: SiO2 Localities: |
| ⓘ 'Serpentine Subgroup' Formula: D3[Si2O5](OH)4 Localities: Reported from at least 20 localities in this region. |
| ⓘ Sphalerite Formula: ZnS |
| ⓘ Stibnite Formula: Sb2S3 Localities: New Almaden Mining District, Santa Clara County, California, USA New Almaden, New Almaden Mining District, Santa Clara County, California, USA New Almaden Mine (New Almaden Mines), New Almaden, New Almaden Mining District, Santa Clara County, California, USA Guadalupe Mine, New Almaden, New Almaden Mining District, Santa Clara County, California, USA References: |
| ⓘ Stilpnomelane Formula: (K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O Description: Occurs in glaucophane schist. |
| ⓘ Tiemannite Formula: HgSe |
| ⓘ Zaratite Formula: Ni3(CO3)(OH)4 · 4H2O ? Description: A minor mineral in the district. |
List of minerals arranged by Strunz 10th Edition classification
| Group 1 - Elements | |||
|---|---|---|---|
| ⓘ | Mercury | 1.AD.05 | Hg |
| Group 2 - Sulphides and Sulfosalts | |||
| ⓘ | Bornite | 2.BA.15 | Cu5FeS4 |
| ⓘ | Tiemannite | 2.CB.05a | HgSe |
| ⓘ | Sphalerite | 2.CB.05a | ZnS |
| ⓘ | Metacinnabar | 2.CB.05a | HgS |
| ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
| ⓘ | Millerite | 2.CC.20 | NiS |
| ⓘ | Galena | 2.CD.10 | PbS |
| ⓘ | Cinnabar | 2.CD.15a | HgS |
| ⓘ | Stibnite | 2.DB.05 | Sb2S3 |
| ⓘ | Pyrite | 2.EB.05a | FeS2 |
| ⓘ | Arsenopyrite | 2.EB.20 | FeAsS |
| Group 3 - Halides | |||
| ⓘ | Fluorite | 3.AB.25 | CaF2 |
| Group 4 - Oxides and Hydroxides | |||
| ⓘ | Chromite | 4.BB.05 | Fe2+Cr3+2O4 |
| ⓘ | Quartz var. Chalcedony | 4.DA.05 | SiO2 |
| ⓘ | 4.DA.05 | SiO2 | |
| ⓘ | Opal | 4.DA.10 | SiO2 · nH2O |
| Group 5 - Nitrates and Carbonates | |||
| ⓘ | Calcite | 5.AB.05 | CaCO3 |
| ⓘ | Dolomite | 5.AB.10 | CaMg(CO3)2 |
| ⓘ | Aragonite | 5.AB.15 | CaCO3 |
| ⓘ | Azurite | 5.BA.05 | Cu3(CO3)2(OH)2 |
| ⓘ | Malachite | 5.BA.10 | Cu2(CO3)(OH)2 |
| ⓘ | Zaratite | 5.DA.15 | Ni3(CO3)(OH)4 · 4H2O ? |
| Group 7 - Sulphates, Chromates, Molybdates and Tungstates | |||
| ⓘ | Baryte ? | 7.AD.35 | BaSO4 |
| ⓘ | Jarosite | 7.BC.10 | KFe3+3(SO4)2(OH)6 |
| ⓘ | Epsomite | 7.CB.40 | MgSO4 · 7H2O |
| Group 9 - Silicates | |||
| ⓘ | Glaucophane | 9.DE.25 | ◻[Na2][Mg3Al2]Si8O22(OH)2 |
| ⓘ | Bavenite | 9.DF.25 | Ca4Be2Al2Si9O26(OH)2 |
| ⓘ | Chrysocolla | 9.ED.20 | Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 |
| ⓘ | Gyrolite | 9.EE.30 | NaCa16Si23AlO60(OH)8 · 14H2O |
| ⓘ | Stilpnomelane | 9.EG.40 | (K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O |
| Unclassified | |||
| ⓘ | 'Petroleum var. Bitumen' | - | |
| ⓘ | 'Apophyllite Group' | - | AB4[Si8O22]X · 8H2O |
| ⓘ | 'Aragotite' (TL) | - | (C,H) |
| ⓘ | 'Serpentine Subgroup' | - | D3[Si2O5](OH)4 |
List of minerals for each chemical element
| H | Hydrogen | |
|---|---|---|
| H | ⓘ Apophyllite Group | AB4[Si8O22]X · 8H2O |
| H | ⓘ Aragotite | (C,H) |
| H | ⓘ Azurite | Cu3(CO3)2(OH)2 |
| H | ⓘ Bavenite | Ca4Be2Al2Si9O26(OH)2 |
| H | ⓘ Chrysocolla | Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 |
| H | ⓘ Epsomite | MgSO4 · 7H2O |
| H | ⓘ Glaucophane | ◻[Na2][Mg3Al2]Si8O22(OH)2 |
| H | ⓘ Gyrolite | NaCa16Si23AlO60(OH)8 · 14H2O |
| H | ⓘ Jarosite | KFe33+(SO4)2(OH)6 |
| H | ⓘ Malachite | Cu2(CO3)(OH)2 |
| H | ⓘ Opal | SiO2 · nH2O |
| H | ⓘ Stilpnomelane | (K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O |
| H | ⓘ Zaratite | Ni3(CO3)(OH)4 · 4H2O ? |
| H | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
| Be | Beryllium | |
| Be | ⓘ Bavenite | Ca4Be2Al2Si9O26(OH)2 |
| C | Carbon | |
| C | ⓘ Aragonite | CaCO3 |
| C | ⓘ Aragotite | (C,H) |
| C | ⓘ Azurite | Cu3(CO3)2(OH)2 |
| C | ⓘ Calcite | CaCO3 |
| C | ⓘ Dolomite | CaMg(CO3)2 |
| C | ⓘ Malachite | Cu2(CO3)(OH)2 |
| C | ⓘ Zaratite | Ni3(CO3)(OH)4 · 4H2O ? |
| O | Oxygen | |
| O | ⓘ Apophyllite Group | AB4[Si8O22]X · 8H2O |
| O | ⓘ Aragonite | CaCO3 |
| O | ⓘ Azurite | Cu3(CO3)2(OH)2 |
| O | ⓘ Baryte | BaSO4 |
| O | ⓘ Bavenite | Ca4Be2Al2Si9O26(OH)2 |
| O | ⓘ Calcite | CaCO3 |
| O | ⓘ Quartz var. Chalcedony | SiO2 |
| O | ⓘ Chromite | Fe2+Cr23+O4 |
| O | ⓘ Chrysocolla | Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 |
| O | ⓘ Dolomite | CaMg(CO3)2 |
| O | ⓘ Epsomite | MgSO4 · 7H2O |
| O | ⓘ Glaucophane | ◻[Na2][Mg3Al2]Si8O22(OH)2 |
| O | ⓘ Gyrolite | NaCa16Si23AlO60(OH)8 · 14H2O |
| O | ⓘ Jarosite | KFe33+(SO4)2(OH)6 |
| O | ⓘ Malachite | Cu2(CO3)(OH)2 |
| O | ⓘ Opal | SiO2 · nH2O |
| O | ⓘ Quartz | SiO2 |
| O | ⓘ Stilpnomelane | (K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O |
| O | ⓘ Zaratite | Ni3(CO3)(OH)4 · 4H2O ? |
| O | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
| F | Fluorine | |
| F | ⓘ Fluorite | CaF2 |
| Na | Sodium | |
| Na | ⓘ Glaucophane | ◻[Na2][Mg3Al2]Si8O22(OH)2 |
| Na | ⓘ Gyrolite | NaCa16Si23AlO60(OH)8 · 14H2O |
| Na | ⓘ Stilpnomelane | (K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O |
| Mg | Magnesium | |
| Mg | ⓘ Dolomite | CaMg(CO3)2 |
| Mg | ⓘ Epsomite | MgSO4 · 7H2O |
| Mg | ⓘ Glaucophane | ◻[Na2][Mg3Al2]Si8O22(OH)2 |
| Mg | ⓘ Stilpnomelane | (K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O |
| Al | Aluminium | |
| Al | ⓘ Bavenite | Ca4Be2Al2Si9O26(OH)2 |
| Al | ⓘ Chrysocolla | Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 |
| Al | ⓘ Glaucophane | ◻[Na2][Mg3Al2]Si8O22(OH)2 |
| Al | ⓘ Gyrolite | NaCa16Si23AlO60(OH)8 · 14H2O |
| Al | ⓘ Stilpnomelane | (K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O |
| Si | Silicon | |
| Si | ⓘ Apophyllite Group | AB4[Si8O22]X · 8H2O |
| Si | ⓘ Bavenite | Ca4Be2Al2Si9O26(OH)2 |
| Si | ⓘ Quartz var. Chalcedony | SiO2 |
| Si | ⓘ Chrysocolla | Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 |
| Si | ⓘ Glaucophane | ◻[Na2][Mg3Al2]Si8O22(OH)2 |
| Si | ⓘ Gyrolite | NaCa16Si23AlO60(OH)8 · 14H2O |
| Si | ⓘ Opal | SiO2 · nH2O |
| Si | ⓘ Quartz | SiO2 |
| Si | ⓘ Stilpnomelane | (K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O |
| Si | ⓘ Serpentine Subgroup | D3[Si2O5](OH)4 |
| S | Sulfur | |
| S | ⓘ Arsenopyrite | FeAsS |
| S | ⓘ Baryte | BaSO4 |
| S | ⓘ Bornite | Cu5FeS4 |
| S | ⓘ Chalcopyrite | CuFeS2 |
| S | ⓘ Cinnabar | HgS |
| S | ⓘ Epsomite | MgSO4 · 7H2O |
| S | ⓘ Galena | PbS |
| S | ⓘ Jarosite | KFe33+(SO4)2(OH)6 |
| S | ⓘ Metacinnabar | HgS |
| S | ⓘ Millerite | NiS |
| S | ⓘ Pyrite | FeS2 |
| S | ⓘ Sphalerite | ZnS |
| S | ⓘ Stibnite | Sb2S3 |
| K | Potassium | |
| K | ⓘ Jarosite | KFe33+(SO4)2(OH)6 |
| K | ⓘ Stilpnomelane | (K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O |
| Ca | Calcium | |
| Ca | ⓘ Aragonite | CaCO3 |
| Ca | ⓘ Bavenite | Ca4Be2Al2Si9O26(OH)2 |
| Ca | ⓘ Calcite | CaCO3 |
| Ca | ⓘ Dolomite | CaMg(CO3)2 |
| Ca | ⓘ Fluorite | CaF2 |
| Ca | ⓘ Gyrolite | NaCa16Si23AlO60(OH)8 · 14H2O |
| Ca | ⓘ Stilpnomelane | (K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O |
| Cr | Chromium | |
| Cr | ⓘ Chromite | Fe2+Cr23+O4 |
| Fe | Iron | |
| Fe | ⓘ Arsenopyrite | FeAsS |
| Fe | ⓘ Bornite | Cu5FeS4 |
| Fe | ⓘ Chalcopyrite | CuFeS2 |
| Fe | ⓘ Chromite | Fe2+Cr23+O4 |
| Fe | ⓘ Jarosite | KFe33+(SO4)2(OH)6 |
| Fe | ⓘ Pyrite | FeS2 |
| Fe | ⓘ Stilpnomelane | (K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36 · nH2O |
| Ni | Nickel | |
| Ni | ⓘ Millerite | NiS |
| Ni | ⓘ Zaratite | Ni3(CO3)(OH)4 · 4H2O ? |
| Cu | Copper | |
| Cu | ⓘ Azurite | Cu3(CO3)2(OH)2 |
| Cu | ⓘ Bornite | Cu5FeS4 |
| Cu | ⓘ Chalcopyrite | CuFeS2 |
| Cu | ⓘ Chrysocolla | Cu2-xAlx(H2-xSi2O5)(OH)4 · nH2O, x < 1 |
| Cu | ⓘ Malachite | Cu2(CO3)(OH)2 |
| Zn | Zinc | |
| Zn | ⓘ Sphalerite | ZnS |
| As | Arsenic | |
| As | ⓘ Arsenopyrite | FeAsS |
| Se | Selenium | |
| Se | ⓘ Tiemannite | HgSe |
| Sb | Antimony | |
| Sb | ⓘ Stibnite | Sb2S3 |
| Ba | Barium | |
| Ba | ⓘ Baryte | BaSO4 |
| Hg | Mercury | |
| Hg | ⓘ Cinnabar | HgS |
| Hg | ⓘ Mercury | Hg |
| Hg | ⓘ Metacinnabar | HgS |
| Hg | ⓘ Tiemannite | HgSe |
| Pb | Lead | |
| Pb | ⓘ Galena | PbS |
Other Databases
| Link to USGS MRDS: | 60000981 |
|---|
Localities in this Region
- California
- Santa Clara County
- New Almaden Mining District
- New Almaden
- American Mine
- Bernal Mine
- Bowie occurrence
- Brainard occurrence (James Ranch occurrence)
- Central Stope Area Mine (New Almaden - Central Stope Area)
- Cora Blanca Area Mine (New Almaden - Cora Blanca area)
- Costello Mine
- Deep Gulch placer (New Almaden placers & dumps)
- Enriquita Mine
- Guadalupe Lime Company
- Guadalupe Mine
- Hahn Ranch deposits
- Harry Area Mine (New Almaden - Harry Area)
- John Knorr Mine
- Kilday Ranch deposits
- Mine Hill
- New Almaden Mine (New Almaden Mines)
- North Randol Mine
- Permanente Metals Corporation Mine
- Providencia Mine
- New Almaden
- New Almaden Mining District
- Santa Clara County
- California
- Santa Clara County
- New Almaden Mining District
- New Almaden
- San Antonio Mine
- San Francisco Mine
- San Jose Cement Company prospect
- San Mateo Mine
- San Pedro-Almaden Area Mine (New Almaden - San Pedro-Almaden Area)
- Santa Margarita Mine
- Santa Mariana Area Mine
- Santa Teresa Mine
- Senator Mine (El Senador)
- South Randol Mine (New Almaden - South Randol)
- Unnamed Cr mine [1]
- Unnamed Cr prospect [3]
- Unnamed Fluorspar occurrence [1]
- Unnamed Hg mine [1]
- Unnamed Hg prospect [10]
- Unnamed Hg prospect [3]
- Unnamed Hg prospect [7]
- Unnamed Hg prospect [9]
- Unnamed Mn prospect [1]
- Velasco Area Mine (New Almaden - Velasco area)
- Victoria Area Mine (New Almaden - Victoria area)
- New Almaden
- New Almaden Mining District
- Santa Clara County
Other Regions, Features and Areas containing this locality
North America
- Coast MountainsMountain Range
North America PlateTectonic Plate
- Franciscan DomainDomain
USA
- California
- Santa Cruz MountainsMountain Range
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New Almaden Mining District, Santa Clara County, California, USA