Mineral Evolution Database
Created and maintained by the Mineral Evolution Project in partnership with RRUFF and mindat.
Mineral locality data provided by mindat.org



The Mineral Evolution database is currently under development.

The goal of this page is to present localities at which the mineral is found, and estimates of the oldest possible geologic age of the minerals at these localities.


Locality Name:
New Almaden, New Almaden District, Santa Cruz Mts, Santa Clara Co., California, USA

Oldest recorded age at locality: 168
Youngest recorded age at locality: 168

mindat Locality ID: 92283
mindat URL: http://www.mindat.org/loc-92283.html

Tectonic Settings:

Total number of sublocalities beneath "New Almaden, New Almaden District, Santa Cruz Mts, Santa Clara Co., California, USA": 41
Total number of bottom-level sublocalities: 41

Number of Child Localities: 41
Child Localities:
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
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)

Latitude: 37°11'18"N
Longitude: 121°50'59"W
Decimal Degree (lat, lon): 37.188333333333,-121.84972222222
AThis mineral is Anthropogenic.
GThis mineral is directly dated.
BThis mineral is reported as having this age.
YThis mineral is using an age reported as an element mineralization period.
OThis mineral is using an age calculated from all data at the locality.
RThe age displayed for this mineral originates from a different, non-child locality.
PThe age displayed for this mineral is the range of ages for this mineral at all of this locality's children.
This mineral's age has not yet been recorded.

This Mineral list contains entries from this locality, including sub-localities. Minerals in bold are reported by mindat.org as occurring directly at this locality, and do not occur at any children (sublocalities) of this locality.

Elements at this locality, including sub-localities: Al As C Ca Cr Cu F Fe H Hg K Mg Na Ni O Pb S Sb Se Si Zn 

Elements from minerals reported directly at this locality: 

Structural Groups for minerals in this locality: 
AllophaneAluniteAmorphousArsenopyriteCalciteChalcopyriteEpsomiteFluoriteGyroliteMalachite
MilleriteNoneNot in a structural groupPyriteQuartzRocksaltSphaleriteSpinelStibnite

24 IMA Minerals at location:
Arsenopyrite  (*)Azurite  (*)Bornite  (*)Calcite  (*)Chalcopyrite  (*)
Chromite  (*)Chrysocolla  (*)Cinnabar  (*)Dolomite  (*)Epsomite  (*)
Fluorite  (*)Galena  (*)Gyrolite  (*)Jarosite  (*)Malachite  (*)
Mercury  (*)Metacinnabar  (*)Millerite  (*)Opal  (*)Pyrite  (*)
Quartz  (*)Sphalerite  (*)Stibnite  (*)Tiemannite  (*)
Mineral nameStructural GroupsIMA FormulaMax Age (Ma)Min Age (Ma)# of Sublocalities containing mineralLOCALITY IDs, not mindat ids# of localities containing mineral
Arsenopyrite  (*)ArsenopyriteFeAsS11762789052
Azurite  (*)Not in a structural groupCu3(CO3)2(OH)211762725509
Bornite  (*)NoneCu5FeS411762725516
Calcite  (*)CalciteCa(CO3)4176272,176278,176279,17628627770
Chalcopyrite  (*)ChalcopyriteCuFeS22176272,17627827198
Chromite  (*)SpinelFe2+Cr2O416816811762763902
Chrysocolla  (*)Allophane(Cu2-xAlx)H2-xSi2O5(OH)4·nH2O11762873531
Cinnabar  (*)NoneHgS22176262,176263,176265,176266,176267,176269,176270,176272,176274,176278,176279,176281,176282,176283,176285,176286,176288,176289,176290,176291,176301,1763022600
Dolomite  (*)NoneCaMg(CO3)28176263,176267,176272,176274,176278,176285,176288,1762909895
Epsomite  (*)EpsomiteMg(SO4)·7H2O1176278484
Fluorite  (*)FluoriteCaF211762949617
Galena  (*)RocksaltPbS2176272,17627824243
Gyrolite  (*)GyroliteNaCa16(Si23Al)O60(OH)8·14H2O1176278142
Jarosite  (*)AluniteKFe3+3(SO4)2(OH)611762782228
Malachite  (*)MalachiteCu2(CO3)(OH)2117627212537
Mercury  (*)NoneHg6176266,176272,176274,176278,176279,176291397
Metacinnabar  (*)SphaleriteHgS2176272,176278255
Millerite  (*)MilleriteNiS11762781066
Opal  (*)AmorphousSiO2·nH2O2176272,1762782994
Pyrite  (*)PyriteFeS23176272,176278,17628539462
Quartz  (*)QuartzSiO29176262,176263,176267,176272,176277,176278,176286,176288,17628961156
Sphalerite  (*)SphaleriteZnS117627221482
Stibnite  (*)StibniteSb2S32176272,1762783418
Tiemannite  (*)SphaleriteHgSe117627283


1 Ages assigned to this locality:

Excel IDMax Age (Ma)Min Age (Ma)Age as listed in referenceDating MethodAge InterpretPrioritized?Sample SourceSample NumRun NumAge from other LocalityDated MineralMinerals explicitely stated as having this ageAge applies to these ElementsMinDat Locality IDDated Locality (Max Age)Location as listed in referenceReferenceReference DOIReference IDAge Notes
podchrome-00018168168Middle Jurassic (U-Pb, zircon in plagiogranite?)       Cr92263Kilday Ranch Deposits, New Almaden, New Almaden District, Santa Cruz Mts, Santa Clara Co., California, USAKilday RanchMoiser et al. (2012) USGSSIR2012_5157 

SampleSource LocalityReference URL

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