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Denver Shaft, Groundhog Mine, Vanadium, Central District, Grant Co., New Mexico, USA

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Latitude & Longitude (WGS84): 32° 46' 7'' North , 108° 6' 45'' West
Latitude & Longitude (decimal): 32.76861,-108.11250
Köppen climate type:BSk : Cold semi-arid (steppe) climate

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Mineral List

3 valid minerals.

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.

Click on geological units on the map for more information. Click here to view full-screen map on

Rupelian - Priabonian
28.1 - 37.8 Ma

ID: 2740978
Lower middle Tertiary rhyolitic to dacitic pyroclastic rocks of the Datil Group, ash-flow tuffs

Age: Paleogene (28.1 - 37.8 Ma)

Stratigraphic Name: Chiquito Peak Tuff; Kneeling Nun Tuff; Caballo Blanco Rhyolite Tuff; Datil Well Tuff; Rock House Canyon Tuff; Blue Canyon Tuff; Sugarlump Tuff; Oak Creek Tuff; Gillespie Tuff; Box Canyon Rhyolite Tuff; Cooney Tuff

Description: Regional ash-flow tuffs include Hell's Mesa, Kneeling Nun, Caballo Blanco, Datil Well, Leyba Well, Rock House Canyon, Blue Canyon, Sugarlump, Oak Creek, Bluff Creek, Gillespie, Box Canyon, Cooney and Chiquito Peak Tuffs; the tuffs of Steins Mountain, Black Bill Canyon, Woodhaul Canyon, and Farr Ranch; tuffs of the Organ cauldron; and lower tuffs in the Bell Top Formation. Includes some locally erupted lavas and tuffs within thick intra-caldera units; includes minor volcaniclastic sedimentary units and lavas between thin outflow sheets.

Lithology: Major:{felsic volcanic}, Minor:{clastic}

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

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.


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Lasky, Samuel Grossman (1936) Geology and ore deposits of the Bayard area, Central Mining District, New Mexico. USGS Bulletin 870

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