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Mt Antero, Chaffee Co., Colorado, USA

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Latitude & Longitude (WGS84): 38° 40' 26'' North , 106° 14' 48'' West
Latitude & Longitude (decimal): 38.67389,-106.24694
Köppen climate type:Dfc : Subarctic climate

Mt. Antero may be the highest elevation mineral-collecting locality in the contiguous 48 states, at over 13,000 feet (over 3,962m). 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 (4,267m) 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 (over 4,267m) 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/8.5 kilometers 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 hornblende and biotite. The monzonite consists of andesine, orthoclase, quartz, hornblende, 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

38 valid minerals.

Rock Types Recorded

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

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Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

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Miocene - Eocene
5.333 - 56 Ma

ID: 2805458
Middle Tertiary intrusive rocks

Age: Cenozoic (5.333 - 56 Ma)

Description: Intermediate to felsic compositions

Lithology: Major:{mafic hypabyssal,felsic hypabyssal}

Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. [133]

Data and map coding provided by, used under Creative Commons Attribution 4.0 License

Localities in this Region

This page 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.


Bowman, H.L. (1911) On the occurrence of bertrandite at the Cheesewring Quarry, near Liskeard, Cornwall. Mineralogical Magazine, vol. 16, n° 73, 47-50. (bertrandite at Mt Antero).

Russell, A. (1911) On the occurrence of phenacite in Cornwall. Mineralogical Magazine, vol. 16, n° 73, 55-62. (phenakite associated with bertrandite, fluorite, and quartz at Mt Antero).

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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