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:
Cook Co., Minnesota, USA

Oldest recorded age at locality: 2732.93
Youngest recorded age at locality: 256.47

mindat Locality ID: 31295
mindat URL: http://www.mindat.org/loc-31295.html

Tectonic Settings:

Total number of sublocalities beneath "Cook Co., Minnesota, USA": 43
Total number of bottom-level sublocalities: 37

Number of Child Localities: 21
Child Localities:
Blankenberg Prospect
Cobalt Prospect
Duluth Gabbro Deposit
Grand Marais
Graphite Pit No. 2
Green Prospect Pit
Gunflint Corridor
Lake Saganaga-Gold Island Prospect
Loon Lake Occurrence
Lutsen
McFarland Lake Prospect
Mineral Center
Northern Range
Old Silver Mine
Onion River Falls
Pigeon Point
Rove Slate Area Prospect Pits
Schroeder
Southern Range
Spalding Mine
Tofte

Latitude: 47°57'41"N
Longitude: 90°31'54"W
Decimal Degree (lat, lon): 47.961388888889,-90.531666666667

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.

Calcite	Chalcopyrite	Copper	Corundum	Cubanite	Fluorite	Gadolinite	Natrolite	Nickeline	None
Pentlandite	Prehnite	Pyrite	Pyroxene	Quartz	Sphalerite	Spinel	Thomsonite	Wurtzite

Augite ()*	Bornite ()*	Calcite ()*	Chalcocite ()*	Chalcopyrite ()*
Copper ()*	Cubanite ()*	Datolite ()*	Diopside ()*	Fluorite ()*
Gold ()*	Graphite ()*	Hematite ()*	Ilmenite ()*	Magnetite ()*
Mesolite ()*	Pentlandite ()*	Pigeonite ()*	Prehnite ()*	Pyrite ()*
Pyrrhotite ()*	Quartz ()*	Scolecite ()*	Silver ()*	Sphalerite ()*
Thomsonite-Ca ()*	Violarite ()*	Xonotlite ()*

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 Al Au B C Ca Cu F Fe H Mg Na Ni O S Si Ti Zn

Elements from minerals reported directly at this locality: Al B Ca Cu H O S Si

Structural Groups for minerals in this locality:
Calcite Chalcopyrite Copper Corundum Cubanite Fluorite Gadolinite Natrolite Nickeline None
Pentlandite Prehnite Pyrite Pyroxene Quartz Sphalerite Spinel Thomsonite Wurtzite

28 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
Augite ()*	Pyroxene	(Ca,Mg,Fe)₂Si₂O₆			1	223029	2060
Bornite ()*	None	Cu₅FeS₄			2	223006,223007	5516
Calcite ()*	Calcite	Ca(CO₃)			2	223027,223031	27770
Chalcocite ()*	None	Cu₂S	2732.93	256.47	0		5707
Chalcopyrite ()*	Chalcopyrite	CuFeS₂			4	223006,223007,223009,223012	27198
Copper ()*	Copper	Cu			1	223031	3846
Cubanite ()*	Cubanite Wurtzite	CuFe₂S₃			1	223029	802
Datolite ()*	Gadolinite	CaB(SiO₄)(OH)	2732.93	256.47	0		498
Diopside ()*	Pyroxene	CaMgSi₂O₆			1	223012	4135
Fluorite ()*	Fluorite	CaF₂	2732.93	256.47	1	223008	9617
Gold ()*	Copper	Au	2732.93	256.47	3	223008,223011,223036	30554
Graphite ()*	None	C			2	223003,223028	2812
Hematite ()*	Corundum	Fe₂O₃			1	223039	14640
Ilmenite ()*	Corundum	Fe²⁺Ti⁴⁺O₃			7	223015,223016,223017,223018,223024,223028,223034	5433
Magnetite ()*	Spinel	Fe²⁺Fe³⁺₂O₄			8	223015,223016,223017,223018,223024,223028,223029,223034	14899
Mesolite ()*	Natrolite	Na₂Ca₂(Si₉Al₆)O₃₀·8H₂O			1	223039	425
Pentlandite ()*	Pentlandite	(Ni,Fe)₉S₈			2	223028,223029	1512
Pigeonite ()*	Pyroxene	(Mg,Fe,Ca)₂Si₂O₆			1	223028	303
Prehnite ()*	Prehnite	Ca₂Al(Si₃Al)O₁₀(OH)₂	2732.93	256.47	0		1898
Pyrite ()*	Pyrite	FeS₂			4	223009,223011,223028,223036	39462
Pyrrhotite ()*	Nickeline	Fe₇S₈			3	223006,223007,223012	9056
Quartz ()*	Quartz	SiO₂	2732.93	256.47	6	223000,223008,223011,223031,223036,223038	61156
Scolecite ()*	Natrolite	Ca(Si₃Al₂)O₁₀·3H₂O			1	223031	390
Silver ()*	Copper	Ag			1	223011	5186
Sphalerite ()*	Sphalerite	ZnS			1	223012	21482
Thomsonite-Ca ()*	Thomsonite	NaCa₂(Al₅Si₅)O₂₀·6H₂O			1	223001	452
Violarite ()*	Spinel	FeNi₂S₄			1	223028	380
Xonotlite ()*	None	Ca₆Si₆O₁₇(OH)₂			1	223012	109

11 Ages assigned to this locality:

Excel ID	Max Age (Ma)	Min Age (Ma)	Age as listed in reference	Dating Method	Age Interpret	Sample Source	Dated Mineral	MinDat Locality ID	Dated Locality (Max Age)	Reference	Reference ID
USGS-Rb-Sr-01014	2613.66	2613.66	2613.66	Rb-Sr	age of intrusion	whole rock		167127	Lake Saganaga-Gold Island Prospect, Cook Co., Minnesota, USA	USGS-Rb-Sr	USGS-Rb-Sr
USGS-Rb-Sr-01015	2564.72	2564.72	2564.72	Rb-Sr	minimum age of intrusion	whole rock		167127	Lake Saganaga-Gold Island Prospect, Cook Co., Minnesota, USA	USGS-Rb-Sr	USGS-Rb-Sr
USGS-Rb-Sr-01016	2564.72	2564.72	2564.72	Rb-Sr	minimum age of intrusion	sericite		167127	Lake Saganaga-Gold Island Prospect, Cook Co., Minnesota, USA	USGS-Rb-Sr	USGS-Rb-Sr
USGS-Rb-Sr-01017	2564.72	2564.72	2564.72	Rb-Sr	minimum age of intrusion	sericite		167127	Lake Saganaga-Gold Island Prospect, Cook Co., Minnesota, USA	USGS-Rb-Sr	USGS-Rb-Sr
USGS-Rb-Sr-01018	2732.93	2732.93	2732.93	Rb-Sr	minimum age of intrusion	sericite		167127	Lake Saganaga-Gold Island Prospect, Cook Co., Minnesota, USA	USGS-Rb-Sr	USGS-Rb-Sr
USGS-Rb-Sr-01019	2598.35	2598.35	2598.35	Rb-Sr	age not evaluated	microcline	Microcline	167127	Lake Saganaga-Gold Island Prospect, Cook Co., Minnesota, USA	USGS-Rb-Sr	USGS-Rb-Sr
USGS-Rb-Sr-01020	2722.58	2722.58	2722.58	Rb-Sr	minimum age of intrusion	microcline	Microcline	167127	Lake Saganaga-Gold Island Prospect, Cook Co., Minnesota, USA	USGS-Rb-Sr	USGS-Rb-Sr
USGS-Rb-Sr-01021	256.47	256.47	256.47	Rb-Sr	minimum age of intrusion	sericite		167127	Lake Saganaga-Gold Island Prospect, Cook Co., Minnesota, USA	USGS-Rb-Sr	USGS-Rb-Sr
USGS-Rb-Sr-01022	2564.72	2564.72	2564.72	Rb-Sr	minimum age of intrusion	microcline	Microcline	167127	Lake Saganaga-Gold Island Prospect, Cook Co., Minnesota, USA	USGS-Rb-Sr	USGS-Rb-Sr
USGS-Rb-Sr-01334	2713	2463	2588±125	Rb-Sr	age of intrusion	sericite		167127	Lake Saganaga-Gold Island Prospect, Cook Co., Minnesota, USA	USGS-Rb-Sr	USGS-Rb-Sr
USGS-Rb-Sr-01335	2702.65	2452.65	2577.65±125	Rb-Sr	age of intrusion	k-feldspar		167127	Lake Saganaga-Gold Island Prospect, Cook Co., Minnesota, USA	USGS-Rb-Sr	USGS-Rb-Sr

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...