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:
Express Mine (Express - Headlight Mine), Bonanza District (Kerber Creek District), Saguache Co., Colorado, USA

Oldest recorded age at locality: 27.82
Youngest recorded age at locality: 23.03

mindat Locality ID: 118514
mindat URL: http://www.mindat.org/loc-118514.html

Tectonic Settings:

Total number of sublocalities beneath "Express Mine (Express - Headlight Mine), Bonanza District (Kerber Creek District), Saguache Co., Colorado, USA": 0
Total number of bottom-level sublocalities: 0

Latitude: 38°15'5"N
Longitude: 106°6'35"W
Decimal Degree (lat, lon): 38.251388888889,-106.10972222222

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	Covellite	Enargite	Fluorite	None	Pyrite	Quartz	Rocksalt	Sphalerite
Tetrahedrite	Wurtzite

Bornite ()*	Chalcopyrite ()*	Covellite ()*	Enargite ()*	Fluorite ()*
Galena ()*	Pyrargyrite ()*	Pyrite ()*	Quartz ()*	Rhodochrosite ()*
Sphalerite ()*	Stromeyerite ()*	Tennantite-(Fe) ()*

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 C Ca Cu F Fe Mn O Pb S Sb Si Zn

Elements from minerals reported directly at this locality: Ag As C Ca Cu F Fe Mn O Pb S Sb Si Zn

Structural Groups for minerals in this locality:
Calcite Chalcopyrite Covellite Enargite Fluorite None Pyrite Quartz Rocksalt Sphalerite
Tetrahedrite Wurtzite

13 IMA Minerals at location:

Mineral name	Structural Groups	IMA Formula	Max Age (Ma)	Min Age (Ma)	# of localities containing mineral
Bornite ()*	None	Cu₅FeS₄	27.82	23.03	5516
Chalcopyrite ()*	Chalcopyrite	CuFeS₂	27.82	23.03	27198
Covellite ()*	Covellite	CuS	27.82	23.03	4165
Enargite ()*	Enargite Wurtzite	Cu₃AsS₄	27.82	23.03	910
Fluorite ()*	Fluorite	CaF₂	27.82	23.03	9617
Galena ()*	Rocksalt	PbS	27.8	27.8	24243
Pyrargyrite ()*	None	Ag₃SbS₃	27.8	27.8	1425
Pyrite ()*	Pyrite	FeS₂	27.82	23.03	39462
Quartz ()*	Quartz	SiO₂	27.82	23.03	61156
Rhodochrosite ()*	Calcite	Mn(CO₃)	27.82	23.03	1711
Sphalerite ()*	Sphalerite	ZnS	27.8	27.8	21482
Stromeyerite ()*	None	CuAgS	27.8	27.8	332
Tennantite-(Fe) ()*	Tetrahedrite	Cu₆(Cu₄Fe₂)As₄S₁₃	27.82	23.03	1803

4 Ages assigned to this locality:

Excel ID	Max Age (Ma)	Min Age (Ma)	Age as listed in reference	Dating Method	Age Interpret	Age from other Locality	Minerals explicitely stated as having this age	Age applies to these Elements	MinDat Locality ID	Dated Locality (Max Age)	Reference	Reference DOI	Reference ID	Age Notes
Hg-00100	27.82	23.03	mid to late Oligocene	?-?	Volcanism and Caldera development	Yes	Mazzettiite	Hg	50124	Bonanza District (Kerber Creek District), Saguache Co., Colorado, USA	Pride and Hasenohr (1983)	10.1016/0375-6742(83)90034-1	JGE19_405
Hg-00100a	27.8	27.8	27.8	?-?		Yes	Mazzettiite	Hg, Au, Ag, Pb, Zn	50124	Bonanza District (Kerber Creek District), Saguache Co., Colorado, USA	Rose and Pride (2010)		GSAAP42_54	Eruption of the Bonanza tuff 27.8 ma preceded caldera formation and development of gold, silver, lead, zinc, and copper mineralization in the Bonanza region
Mo-00256	27.82	23.03	mid to late Oligocene	?-?	Volcanism and Caldera development	Yes	Molybdenite	Mo	50124	Bonanza District (Kerber Creek District), Saguache Co., Colorado, USA	Pride and Hasenohr (1983)	10.1016/0375-6742(83)90034-1	JGE19_405
Mo-00256a	27.8	27.8	27.8	?-?		Yes	Molybdenite	Mo, Au, Ag, Pb, Zn	50124	Bonanza District (Kerber Creek District), Saguache Co., Colorado, USA	Rose and Pride (2010)		GSAAP42_54	Eruption of the Bonanza tuff 27.8 ma preceded caldera formation and development of gold, silver, lead, zinc, and copper mineralization in the Bonanza region

Sample	Source Locality	Reference URL

All locality data graciously provided by mindat.org

All age data...