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:
Little Jenny Mine (Jennie Mine; Jenny Mine), Bonanza District (Kerber Creek District), Saguache Co., Colorado, USA

Oldest recorded age at locality: 27.82
Youngest recorded age at locality: 23.03

mindat Locality ID: 118562
mindat URL: http://www.mindat.org/loc-118562.html

Tectonic Settings:

Total number of sublocalities beneath "Little Jenny Mine (Jennie Mine; Jenny Mine), Bonanza District (Kerber Creek District), Saguache Co., Colorado, USA": 0
Total number of bottom-level sublocalities: 0

Latitude: 38°19'46"N
Longitude: 106°7'47"W
Decimal Degree (lat, lon): 38.329444444444,-106.12972222222

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: Ag As C Cu Fe Mn O Pb S Si 

Elements from minerals reported directly at this locality: Ag As C Ca Cu Fe Mn O Pb S Si 

Structural Groups for minerals in this locality: 
CalciteChalcopyriteNonePyriteQuartzRhodoniteRocksaltTetrahedrite

8 IMA Minerals at location:
Chalcopyrite  (*)Galena  (*)Pyrite  (*)Quartz  (*)Rhodochrosite  (*)
Rhodonite  (*)Stromeyerite  (*)Tennantite-(Fe)  (*)
Mineral nameStructural GroupsIMA FormulaMax Age (Ma)Min Age (Ma)# of Sublocalities containing mineralLOCALITY IDs, not mindat ids# of localities containing mineral
Chalcopyrite  (*)ChalcopyriteCuFeS227.8223.03027198
Galena  (*)RocksaltPbS27.827.8024243
Pyrite  (*)PyriteFeS227.8223.03039462
Quartz  (*)QuartzSiO227.8223.03061156
Rhodochrosite  (*)CalciteMn(CO3)27.8223.0301711
Rhodonite  (*)RhodoniteCaMn3Mn(Si5O15)27.8223.030969
Stromeyerite  (*)NoneCuAgS27.827.80332
Tennantite-(Fe)  (*)TetrahedriteCu6(Cu4Fe2)As4S1327.8223.0301803



4 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
Hg-0010027.8223.03mid to late Oligocene?-?Volcanism and Caldera development   YesMazzettiiteHg50124Bonanza District (Kerber Creek District), Saguache Co., Colorado, USA Pride and Hasenohr (1983)10.1016/0375-6742(83)90034-1JGE19_405 
Hg-00100a27.827.827.8?-?    YesMazzettiiteHg, Au, Ag, Pb, Zn50124Bonanza District (Kerber Creek District), Saguache Co., Colorado, USA Rose and Pride (2010) GSAAP42_54Eruption of the Bonanza tuff 27.8 ma preceded caldera formation and development of gold, silver, lead, zinc, and copper mineralization in the Bonanza region
Mo-0025627.8223.03mid to late Oligocene?-?Volcanism and Caldera development   YesMolybdeniteMo50124Bonanza District (Kerber Creek District), Saguache Co., Colorado, USA Pride and Hasenohr (1983)10.1016/0375-6742(83)90034-1JGE19_405 
Mo-00256a27.827.827.8?-?    YesMolybdeniteMo, Au, Ag, Pb, Zn50124Bonanza District (Kerber Creek District), Saguache Co., Colorado, USA Rose and Pride (2010) GSAAP42_54Eruption of the Bonanza tuff 27.8 ma preceded caldera formation and development of gold, silver, lead, zinc, and copper mineralization in the Bonanza region


SampleSource LocalityReference URL


All locality data graciously provided by mindat.org

All age data...

Other copyright data...