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:
Gertrude (G-pit), Maybell Mines, Maybell District, Moffat Co., Colorado, USA

Oldest recorded age at locality: 23.03
Youngest recorded age at locality: 5.3

mindat Locality ID: 116231
mindat URL: http://www.mindat.org/loc-116231.html

Tectonic Settings:

Total number of sublocalities beneath "Gertrude (G-pit), Maybell Mines, Maybell District, Moffat Co., Colorado, USA": 0
Total number of bottom-level sublocalities: 0

Latitude: 40°33'14"N
Longitude: 107°58'34"W
Decimal Degree (lat, lon): 40.553888888889,-107.97611111111

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.

Amorphous	Apatite	Autunite	Fluorite	Fritzscheite	Meta-autunite	None	Pyrite	Schoepite	Zircon

Autunite ()*	Becquerelite ()*	Carnotite ()*	Coffinite ()*	Fluorapatite ()*
Liebigite ()*	Meta-autunite ()*	Metatorbernite ()*	Metatyuyamunite ()*	Opal ()*
Pyrite ()*	Schoepite ()*	Schröckingerite ()*	Tyuyamunite ()*	Uraninite ()*
Uranophane-α ()*

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: C Ca Cu F Fe H K Na O P S Si U V

Elements from minerals reported directly at this locality: C Ca Cu F Fe H K Na O P S Si U V

Structural Groups for minerals in this locality:
Amorphous Apatite Autunite Fluorite Fritzscheite Meta-autunite None Pyrite Schoepite Zircon

16 IMA Minerals at location:

Mineral name	Structural Groups	IMA Formula	Max Age (Ma)	Min Age (Ma)	# of localities containing mineral
Autunite ()*	Autunite	Ca(UO₂)₂(PO₄)₂·10-12H₂O	23.03	5.3	1272
Becquerelite ()*	None	Ca(UO₂)₆O₄(OH)₆·8H₂O	23.03	5.3	92
Carnotite ()*	None	K₂(UO₂)₂(VO₄)₂·3H₂O	23.03	5.3	1184
Coffinite ()*	Zircon	U(SiO₄)·nH₂O	23.03	5.3	566
Fluorapatite ()*	Apatite	Ca₅(PO₄)₃F	23.03	5.3	2740
Liebigite ()*	None	Ca₂(UO₂)(CO₃)₃·11H₂O	23.03	5.3	78
Meta-autunite ()*	Meta-autunite	Ca(UO₂)₂(PO₄)₂·6H₂O	23.03	5.3	388
Metatorbernite ()*	None	Cu(UO₂)₂(PO₄)₂·8H₂O	23.03	5.3	443
Metatyuyamunite ()*	Fritzscheite	Ca(UO₂)₂(VO₄)₂·3H₂O	23.03	5.3	129
Opal ()*	Amorphous	SiO₂·nH₂O	23.03	5.3	2994
Pyrite ()*	Pyrite	FeS₂	23.03	5.3	39462
Schoepite ()*	Schoepite	(UO₂)₄O(OH)₆(H₂O)₆	23.03	5.3	94
Schröckingerite ()*	None	NaCa₃(UO₂)(SO₄)(CO₃)₃F·10H₂O	23.03	5.3	128
Tyuyamunite ()*	None	Ca(UO₂)₂(VO₄)₂·5-8H₂O	23.03	5.3	628
Uraninite ()*	Fluorite	UO₂	23.03	5.3	2718
Uranophane-α ()*	None	Ca(UO₂)₂(SiO₃OH)₂·5H₂O	23.03	5.3	890

Locality Notes from all Ages at Locality:

Age ID	Locality Notes
Giersdorf_00000809	Economic ore deposits of the Maybell area are found in the uppermost sandstone unit of the Browns Park Formation. The uranium ore deposits are described as tabular, amoeba-shaped lenses of discontinuous bodies within limited stratigraphic intervals.

1 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
	Giersdorf_00000809	23.03	5.3	23.03-5.3		The Browns Park formation is dated to be Miocene in age and is applied to the uranium mineralization within it.					Yes		Autunite, Becquerelite, Carnotite, Coffinite, Liebigite, Schoepite, Torbernite, Tyuyamunite, Uraninite, Zeunerite	U	133365	Maybell District, Moffat Co., Colorado, USA	Maybell Mining District	Chenoweth (1986)		NINCG_289	In the Maybell area, the Browns Park formation unconformably overlies truncated rocks ranging In age from Precambrian to Eocene, on the north flank of the Axial Basin anticline. The Browns Park formation is dated to be Miocene in age.

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...