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 Dora Mine, San Juan Co., Colorado, USA

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

mindat Locality ID: 14860
mindat URL: http://www.mindat.org/loc-14860.html

Tectonic Settings:

Total number of sublocalities beneath "Little Dora Mine, San Juan Co., Colorado, USA": 0
Total number of bottom-level sublocalities: 0

Latitude: 37°48'4"N
Longitude: 107°40'22"W
Decimal Degree (lat, lon): 37.801111111111,-107.67277777778

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.

Columbite	Fluorite	None	Quartz

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: Ca F Mn O Si W

Elements from minerals reported directly at this locality: Ca F Mn O Si W

Structural Groups for minerals in this locality:
Columbite Fluorite None Quartz

3 IMA Minerals at location:

Fluorite ()*	Hübnerite ()*	Quartz ()*

Mineral name	Structural Groups	IMA Formula	Max Age (Ma)	Min Age (Ma)	# of localities containing mineral
Fluorite ()*	Fluorite	CaF₂	26	20	9617
Hübnerite ()*	Columbite	Mn²⁺(WO₄)	26	20	469
Quartz ()*	Quartz	SiO₂	26	20	61156

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...