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Mt Antero, Chaffee Co., Colorado, USA

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Latitude & Longitude (WGS84): 38° 40' 26'' North , 106° 14' 49'' West
Latitude & Longitude (decimal): 38.6738888889, -106.246944444

Mt. Antero may be the highest elevation mineral-collecting locality in the contiguous 48 states, at over 13,000 feet. It is generally accessible only in late summer, and then is difficult due to summer storms and low oxygen levels in the air. It is located within the San Isabel National Forest, about 15 miles northwest of Salida, in a chain of 14,000-foot peaks in the Collegiate Range. Mineral specimens have been collected at Mt. Antero from pegmatites and miarolitic cavities in granite since 1885. (Jacobson, 1979).

Mount Antero is one of many peaks that exceed 14,000 feet in elevation in the Sawatch Mountain Range of Colorado. The Range is oriented from north to south along the western edge of South Park, a large, relatively flat, high mountain valley in central Colorado. The rocks of Mt. Antero are part of the Mt. Princeton Batholith that extends from Mt. Princeton (5.3 miles north of Antero) southward to Shavano Peak.

The batholith is made up of granite and quartz monzonite. The granite is composed of oligoclase, orthoclase, quartz and minor amounts of hornblend and biotite. The monzonite consists of andesine, orthoclase, quartz, hornblend, and some sphene apatite and iron oxides. The included pegmatites contain crystals of microcline and quartz, and secondary hydrothermal minerals such as beryl (aquamarine), phenakite, albite, bertrandite and fluorite.

Mineral List

Mineral list contains entries from the region specified including sub-localities

Regional Geology

Miocene - Eocene5.333 - 56 MaMiddle Tertiary intrusive rocks

Major:: {plutonic rock (phanerit}

Intermediate to felsic compositions

Paleogene23.03 - 66 MaPaleogene volcanic rocks

Volcanic rocks

May include hypabyssal intrusions.

Paleogene23.03 - 66 MaPaleogene plutonic: undivided granitic rocks

Plutonic: undivided granitic rocks

References for regional geology:

Data provided by

Garrity, C.P., and Soller, D.R.,. Database of the Geologic Map of North America: adapted from the map by J.C. Reed, Jr. and others (2005). U.S. Geological Survey Data Series 424 .

USGS compilers. State geologic map data. State Maps.

Geological Survey of Canada. Generalized geological map of the world and linked databases. doi:10.4095/195142. Open File 2915d.

38 valid minerals.

Localities in this Region

The above list contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


Switzer (1939), American Mineralogist: volume 24.

Eckels, E. B. (1957), Minerals of Colorado.

Mineralogical Record (1971): 2: 102.

Jacobson, M.I. (1979). Famous mineral localities: Mount Antero. Mineralogical Record: 10(6): 339-346.

Mineralogical Record (1987): 18: 360.

Mineralogical Record (1993): 24: 222.

Colorado Central Magazine (1996): 30: 13.

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