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:
Grand Island, Caribou District, Boulder Co., Colorado, USA

Oldest recorded age at locality: 69.3
Youngest recorded age at locality: 56.7

mindat Locality ID: 278552
mindat URL: http://www.mindat.org/loc-278552.html

Tectonic Settings:

Total number of sublocalities beneath "Grand Island, Caribou District, Boulder Co., Colorado, USA": 7
Total number of bottom-level sublocalities: 6

Number of Child Localities: 5
Child Localities:
Caribou Mine
Caribou Mine Group
Golden Reward Occurrence
Grand Island Mine
Shirley Lode

Latitude: 39°58'9"N
Longitude: 105°34'48"W
Decimal Degree (lat, lon): 39.969166666667,-105.58

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.

Acanthite	Aragonite	Calcite	Chalcopyrite	Clay	Copper	Covellite	Fluorite	Jalpaite	Malachite
Melonite	None	Not in a structural group	Polybasite	Pyrite	Quartz	Rocksalt	Serpentine	Sphalerite	Tetrahedrite

Acanthite ()*	Altaite ()*	Azurite ()*	Calcite ()*	Cerussite ()*
Chalcopyrite ()*	Chlorargyrite ()*	Chrysotile ()*	Coloradoite ()*	Covellite ()*
Dolomite ()*	Galena ()*	Gold ()*	Jalpaite ()*	Malachite ()*
Melonite ()*	Gersdorffite-Pa3 ()*	Pearceite ()*	Petzite ()*	Polybasite ()*
Proustite ()*	Pyrargyrite ()*	Pyrite ()*	Quartz ()*	Siderite ()*
Silver ()*	Sphalerite ()*	Stephanite ()*	Stromeyerite ()*	Sylvanite ()*
Tetrahedrite-(Zn) ()*	Uraninite ()*

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 Au C Ca Cl Cu Fe H Hg Mg Ni O Pb S Sb Si Te U Zn

Elements from minerals reported directly at this locality:

Structural Groups for minerals in this locality:
Acanthite Aragonite Calcite Chalcopyrite Clay Copper Covellite Fluorite Jalpaite Malachite
Melonite None Not in a structural group Polybasite Pyrite Quartz Rocksalt Serpentine Sphalerite Tetrahedrite

32 IMA Minerals at location:

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
Acanthite ()*	Acanthite	Ag₂S	69.3	56.7	1	184491	2793
Altaite ()*	Rocksalt	PbTe	69.3	56.7	2	184494,184495	489
Azurite ()*	Not in a structural group	Cu₃(CO₃)₂(OH)₂	69.3	56.7	1	184492	5509
Calcite ()*	Calcite	Ca(CO₃)	69.3	56.7	1	184491	27770
Cerussite ()*	Aragonite	Pb(CO₃)	69.3	56.7	1	184491	4979
Chalcopyrite ()*	Chalcopyrite	CuFeS₂	69.3	56.7	1	184491	27198
Chlorargyrite ()*	Rocksalt	AgCl	69.3	56.7	1	184491	1382
Chrysotile ()*	Serpentine Clay	Mg₃Si₂O₅(OH)₄	69.3	56.7	1	184491	951
Coloradoite ()*	Sphalerite	HgTe	69.3	56.7	2	184494,184495	169
Covellite ()*	Covellite	CuS	69.3	56.7	1	184491	4165
Dolomite ()*	None	CaMg(CO₃)₂	69.3	56.7	1	184491	9895
Galena ()*	Rocksalt	PbS	69.3	56.7	3	184489,184491,184492	24243
Gold ()*	Copper	Au	69.3	56.7	2	184491,184495	30554
Jalpaite ()*	Jalpaite	Ag₃CuS₂	69.3	56.7	1	184491	116
Malachite ()*	Malachite	Cu₂(CO₃)(OH)₂	69.3	56.7	1	184492	12537
Melonite ()*	Melonite	NiTe₂	69.3	56.7	1	184494	207
Gersdorffite-Pa3 ()*	Pyrite	NiAsS	69.3	56.7	1	184491	767
Pearceite ()*	Polybasite	[Ag₉CuS₄][(Ag,Cu)₆(As,Sb)₂S₇]	69.3	56.7	1	184491	249
Petzite ()*	None	Ag₃AuTe₂	69.3	56.7	1	184494	409
Polybasite ()*	Polybasite	[Ag₉CuS₄][(Ag,Cu)₆(Sb,As)₂S₇]	69.3	56.7	1	184491	716
Proustite ()*	None	Ag₃AsS₃	69.3	56.7	1	184491	733
Pyrargyrite ()*	None	Ag₃SbS₃	69.3	56.7	1	184491	1425
Pyrite ()*	Pyrite	FeS₂	69.3	56.7	1	184491	39462
Quartz ()*	Quartz	SiO₂	69.3	56.7	1	184491	61156
Siderite ()*	Calcite	Fe(CO₃)	69.3	56.7	1	184491	6417
Silver ()*	Copper	Ag	69.3	56.7	3	184491,184492,184495	5186
Sphalerite ()*	Sphalerite	ZnS	69.3	56.7	2	184491,184492	21482
Stephanite ()*	None	Ag₅SbS₄	69.3	56.7	1	184491	586
Stromeyerite ()*	None	CuAgS	69.3	56.7	1	184491	332
Sylvanite ()*	Melonite	AgAuTe₄	69.3	56.7	1	184494	337
Tetrahedrite-(Zn) ()*	Tetrahedrite	Cu₆(Cu₄Zn₂)Sb₄S₁₃	69.3	56.7	2	184491,184492	5317
Uraninite ()*	Fluorite	UO₂	69.3	56.7	4	184489,184491,184492,184495	2718

2 Ages assigned to this locality:

	Excel ID	Max Age (Ma)	Min Age (Ma)	Age as listed in reference	Dating Method	Age Interpret	Prioritized?	Sample Source	Sample Num	Run Num	Age from other Locality	Dated Mineral	Minerals explicitely stated as having this age	Age applies to these Elements	MinDat Locality ID	Dated Locality (Max Age)	Location as listed in reference	Reference	Reference DOI	Reference ID	Age Notes
	NAVDAT-32623	69.3	56.7	63±6.3					32623						278552	Grand Island, Caribou District, Boulder Co., Colorado, USA		NAVDAT		NAVDAT
	NAVDAT-32624	69.3	56.7	63±6.3					32624						278552	Grand Island, Caribou District, Boulder Co., Colorado, USA		NAVDAT		NAVDAT

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...