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:
Beartown District (Bear Creek District), San Juan Co., Colorado, USA

Oldest recorded age at locality: 380
Youngest recorded age at locality: 20

mindat Locality ID: 118854
mindat URL: http://www.mindat.org/loc-118854.html

Tectonic Settings:

Total number of sublocalities beneath "Beartown District (Bear Creek District), San Juan Co., Colorado, USA": 9
Total number of bottom-level sublocalities: 9

Number of Child Localities: 9
Child Localities:
Eldorado Claim (MS 16686; Patented Claim: El Dorado)
Gold Bug Mine (Patented Claims: Gold Bug; MS 11619a; Gold Bug Mill Site; MS 11691b; Repeal; MS 11691a; Gold Nugget; MS 11691a)
Golden Shear Mine (Patented Claim: Bonita; MS 11327)
Good Hope Mine (Patented Claims: Good Hope; MS 7764; Wonder; MS 7764)
Kankakee Mine (Pure Gold; Iron Mask; Aurum; Oro; Tunnel Site; Golden Age; Extension; Lake View; Iron King; Crusader Gold Mine; Chance; Gold Coin; Bullion; Unpatented Claims: Kankakee)
Little May Mine
Robinson Mine (Patented Claims: Robertson; MS 12224; MS 12224: Scott)
Summit Mine
Sylvanite Mine

Latitude: 37°43'1"N
Longitude: 107°31'44"W
Decimal Degree (lat, lon): 37.716944444444,-107.52888888889

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.

Baryte	Calcite	Chalcopyrite	Clay	Corundum	Enargite	Kaolinite	Marcasite	Melonite	None
Pyrite	Quartz	Rocksalt	Smectite-vermiculite	Sphalerite	Spinel	Tetrahedrite	Wurtzite

Alunite ()*	Baryte ()*	Bornite ()*	Calaverite ()*	Calcite ()*
Chalcocite ()*	Chalcopyrite ()*	Enargite ()*	Galena ()*	Hematite ()*
Kaolinite ()*	Magnetite ()*	Marcasite ()*	Petzite ()*	Pyrite ()*
Quartz ()*	Siderite ()*	Sphalerite ()*	Sylvanite ()*	Tetrahedrite-(Zn) ()*
Vermiculite ()*

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 As Au Ba C Ca Cu Fe H K Mg O Pb S Sb Si Te Zn

Elements from minerals reported directly at this locality: Al As C Cu Fe H K Mg O S Si

Structural Groups for minerals in this locality:
Baryte Calcite Chalcopyrite Clay Corundum Enargite Kaolinite Marcasite Melonite None
Pyrite Quartz Rocksalt Smectite-vermiculite Sphalerite Spinel Tetrahedrite Wurtzite

21 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
Alunite ()*	None	KAl₃(SO₄)₂(OH)₆	26	20	0		966
Baryte ()*	Baryte	Ba(SO₄)	26	20	9	196239,196240,196241,196242,196243,196244,196245,196246,196247	11547
Bornite ()*	None	Cu₅FeS₄	26	20	8	196240,196241,196242,196243,196244,196245,196246,196247	5516
Calaverite ()*	Melonite	AuTe₂	26	20	8	196240,196241,196242,196243,196244,196245,196246,196247	361
Calcite ()*	Calcite	Ca(CO₃)	26	20	9	196239,196240,196241,196242,196243,196244,196245,196246,196247	27770
Chalcocite ()*	None	Cu₂S	26	20	8	196240,196241,196242,196243,196244,196245,196246,196247	5707
Chalcopyrite ()*	Chalcopyrite	CuFeS₂	26	20	8	196239,196240,196241,196242,196243,196244,196245,196246	27198
Enargite ()*	Enargite Wurtzite	Cu₃AsS₄	26	20	0		910
Galena ()*	Rocksalt	PbS	26	20	9	196239,196240,196241,196242,196243,196244,196245,196246,196247	24243
Hematite ()*	Corundum	Fe₂O₃	26	20	8	196240,196241,196242,196243,196244,196245,196246,196247	14640
Kaolinite ()*	Clay Kaolinite	Al₂Si₂O₅(OH)₄	26	20	1	196240	5591
Magnetite ()*	Spinel	Fe²⁺Fe³⁺₂O₄	26	20	1	196239	14899
Marcasite ()*	Marcasite	FeS₂	26	20	8	196240,196241,196242,196243,196244,196245,196246,196247	5674
Petzite ()*	None	Ag₃AuTe₂	26	20	8	196240,196241,196242,196243,196244,196245,196246,196247	409
Pyrite ()*	Pyrite	FeS₂	26	20	1	196239	39462
Quartz ()*	Quartz	SiO₂	26	20	9	196239,196240,196241,196242,196243,196244,196245,196246,196247	61156
Siderite ()*	Calcite	Fe(CO₃)	26	20	0		6417
Sphalerite ()*	Sphalerite	ZnS	26	20	9	196239,196240,196241,196242,196243,196244,196245,196246,196247	21482
Sylvanite ()*	Melonite	AgAuTe₄	26	20	8	196240,196241,196242,196243,196244,196245,196246,196247	337
Tetrahedrite-(Zn) ()*	Tetrahedrite	Cu₆(Cu₄Zn₂)Sb₄S₁₃	26	20	8	196240,196241,196242,196243,196244,196245,196246,196247	5317
Vermiculite ()*	Clay Smectite-vermiculite	Mg_0.7(Mg,Fe,Al)₆(Si,Al)₈O₂₀(OH)₄·8H₂O	26	20	0		652

3 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	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
Giersdorf_00000596	24	20	22±2	238U-206U			uraninite	K-172	Yes	Uraninite	Uraninite	U	4142	Happy Jack Mine (Blue Dike Mine), White Canyon, White Canyon District, San Juan Co., Utah, USA	Happy Jack Mine	Miller et al. (1963)	10.1130/0016-7606(1963)74[609:IEOTOO]2.0.CO;2	GSAB74_609	Age given for U238-Pb206 analysis
Giersdorf_00000597	26	22	24±2	235U-207Pb			uraninite	K-172	Yes	Uraninite	Uraninite	U	4142	Happy Jack Mine (Blue Dike Mine), White Canyon, White Canyon District, San Juan Co., Utah, USA	Happy Jack Mine	Miller et al. (1963)	10.1130/0016-7606(1963)74[609:IEOTOO]2.0.CO;2	GSAB74_609	Age given for U235-Pb207 analysis
Giersdorf_00000598	380	280	330±50	207Pb-206Pb	The Pb207-Pb206 age given for these samples is described as being highly erroneous due to the systematic sensitivity of the analytic methods	low	uraninite	K-172	Yes	Uraninite	Uraninite	U	4142	Happy Jack Mine (Blue Dike Mine), White Canyon, White Canyon District, San Juan Co., Utah, USA	Happy Jack Mine	Miller et al. (1963)	10.1130/0016-7606(1963)74[609:IEOTOO]2.0.CO;2	GSAB74_609	Age given for Pb207-Pb206 analysis

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...