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:
Chicagof District, Sitka, Alaska, USA

Oldest recorded age at locality: 230
Youngest recorded age at locality: 170

mindat Locality ID: 203119
mindat URL: http://www.mindat.org/loc-203119.html

Tectonic Settings:

Total number of sublocalities beneath "Chicagof District, Sitka, Alaska, USA": 21
Total number of bottom-level sublocalities: 21

Number of Child Localities: 21
Child Localities:
Baranof Queen Prospect
Bauer; Haley And Rogers Prospect
Bonanza #1 Prospect
Free Gold Occurrences
Green Lake Prospect
Henrietta Prospect
Hill Occurrences
Hirst-Chicagof Mine
Lower Ledge; Haley And Rogers Prospect
Lucky Chance Mine
No Name Prospect
Patton Prospect?
Red Bluff Bay Prospects
Silver Bay Prospect
Unnamed Occurrence (ARDF - PA035; Near Redfish Bay)
Unnamed Occurrences (ARDF - PA001; Near Goddard Hot Springs)
Unnamed Occurrences (ARDF - PA015; Near Pinta Lake)
Unnamed Occurrences (ARDF - PA032; Near Mount Muravief)
Unnamed Prospect (ARDF - PA034; Near Snipe Bay)
Unnamed Prospects (ARDF - PA018; Near Lucky Chance Mountain)
Wicked Falls Prospect

Latitude: 56°52'39"N
Longitude: 135°3'1"W
Decimal Degree (lat, lon): 56.8775,-135.05027777778

A	This mineral is Anthropogenic.
G	This mineral is directly dated.
B	This mineral is reported as having this age.
Y	This mineral is using an age reported as an element mineralization period.
O	This mineral is using an age calculated from all data at the locality.
R	The age displayed for this mineral originates from a different, non-child locality.
P	The 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.

Arsenopyrite	Calcite	Chalcopyrite	Copper	Feldspar	Malachite	Nickeline	None	Pentlandite	Pyrite
Quartz	Rocksalt	Spinel

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 Au C Ca Cr Cu Fe H Na Ni O Pb S Si

Elements from minerals reported directly at this locality:

Structural Groups for minerals in this locality:
Arsenopyrite Calcite Chalcopyrite Copper Feldspar Malachite Nickeline None Pentlandite Pyrite
Quartz Rocksalt Spinel

13 IMA Minerals at location:

Albite ()*	Arsenopyrite ()*	Calcite ()*	Chalcopyrite ()*	Chromite ()*
Galena ()*	Gold ()*	Magnetite ()*	Malachite ()*	Pentlandite ()*
Pyrite ()*	Pyrrhotite ()*	Quartz ()*

Mineral name	Structural Groups	IMA Formula	Max Age (Ma)	Min Age (Ma)	# of Sublocalities containing mineral	LOCALITY IDs, not mindat ids	# of localities containing mineral
Albite ()*	Feldspar	Na(AlSi₃O₈)			1	133389	8803
Arsenopyrite ()*	Arsenopyrite	FeAsS			5	133372,133379,133380,133390,133391	9052
Calcite ()*	Calcite	Ca(CO₃)			1	133375	27770
Chalcopyrite ()*	Chalcopyrite	CuFeS₂			4	133377,133384,133388,133389	27198
Chromite ()*	Spinel	Fe²⁺Cr₂O₄	230	170	2	133377,133383	3902
Galena ()*	Rocksalt	PbS			1	133379	24243
Gold ()*	Copper	Au			6	133372,133375,133378,133380,133390,133391	30554
Magnetite ()*	Spinel	Fe²⁺Fe³⁺₂O₄			1	133389	14899
Malachite ()*	Malachite	Cu₂(CO₃)(OH)₂			1	133388	12537
Pentlandite ()*	Pentlandite	(Ni,Fe)₉S₈			1	133389	1512
Pyrite ()*	Pyrite	FeS₂			9	133372,133375,133377,133379,133380,133384,133389,133390,133391	39462
Pyrrhotite ()*	Nickeline	Fe₇S₈			3	133372,133377,133388	9056
Quartz ()*	Quartz	SiO₂			16	133371,133372,133373,133374,133375,133376,133378,133379,133380,133381,133382,133384,133385,133387,133390,133391	61156

8 Ages assigned to this locality:

Excel ID	Max Age (Ma)	Min Age (Ma)	Age as listed in reference	Age applies to these Elements	MinDat Locality ID	Dated Locality (Max Age)	Location as listed in reference	Reference	Reference ID
podchrome-00928	170	170	Permian-Jurassic (169-179 Ma 40Ar-39Ar)	Cr	199624	Red Bluff Bay Prospects, Chicagof District, Sitka, Alaska, USA	Holanada Creek	Moiser et al. (2012)	USGSSIR2012_5157
podchrome-00930	230	230	Triassic	Cr	199624	Red Bluff Bay Prospects, Chicagof District, Sitka, Alaska, USA	Red Bluff Bay 1-2	Moiser et al. (2012)	USGSSIR2012_5157
podchrome-00931	230	230	Triassic	Cr	199624	Red Bluff Bay Prospects, Chicagof District, Sitka, Alaska, USA	Red Bluff Bay 3	Moiser et al. (2012)	USGSSIR2012_5157
podchrome-00932	230	230	Triassic	Cr	199624	Red Bluff Bay Prospects, Chicagof District, Sitka, Alaska, USA	Red Bluff Bay 4	Moiser et al. (2012)	USGSSIR2012_5157
podchrome-00933	230	230	Triassic	Cr	199624	Red Bluff Bay Prospects, Chicagof District, Sitka, Alaska, USA	Red Bluff Bay 5	Moiser et al. (2012)	USGSSIR2012_5157
podchrome-00936	230	230	Triassic	Cr	199624	Red Bluff Bay Prospects, Chicagof District, Sitka, Alaska, USA	Red Bluff Bay 6	Moiser et al. (2012)	USGSSIR2012_5157
podchrome-00937	230	230	Triassic	Cr	199624	Red Bluff Bay Prospects, Chicagof District, Sitka, Alaska, USA	Red Bluff Bay 7-8	Moiser et al. (2012)	USGSSIR2012_5157
podchrome-00938	230	230	Triassic	Cr	199624	Red Bluff Bay Prospects, Chicagof District, Sitka, Alaska, USA	Red Bluff Bay West of 2	Moiser et al. (2012)	USGSSIR2012_5157

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...