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Be True, Buena Vista Area, Free Gold District, Chaffee Co., Colorado, USA

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Latitude & Longitude (WGS84): 38° 49' 59'' North , 106° 7' 59'' West
Latitude & Longitude (decimal): 38.83333,-106.13333
GeoHash:G#: 9wusbvkhd
Köppen climate type:Dfc : Subarctic climate

Commodities (Major) - Uranium; (Trace) - Vanadium
Development Status: Past Producer

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.

No minerals currently recorded for this locality.

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

Late Pleistocene - Middle Pleistocene
0.0117 - 0.781 Ma

ID: 2824423
Gravels and alluviums

Age: Pleistocene (0.0117 - 0.781 Ma)

Description: Includes Broadway and Louviers Alluviums

Lithology: Major:{unconsolidated gravel}

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]

Late Pleistocene
0.0117 - 0.126 Ma

ID: 3301044
Younger flood gravel and channel deposits of Pinedale glaciation

Age: Pleistocene (0.0117 - 0.126 Ma)

Description: Flood gravel consists of very crudely stratified, extremely coarse, boulder gravel in a yellowish-gray to gray, cobble, pebble, and sand matrix deposited in the valley of Arkansas River downstream of Clear Creek. Boulders are as long as about 10 m. These exceptionally large, outsized clasts or “megaclasts” are inter- preted as traction bed load that was deposited during one or more catastrophic releases of impounded glacial meltwater resulting from the failure of a glacial dam at Clear Creek and possibly one at Pine Creek (Lee, 2010). Clasts are composed almost entirely of Proterozoic granitic and gneissic rocks. 10Be surface-exposure ages of four large flood boulders on deposits of unit Qpf indicate a mean age of 17.8±0.5 ka (Young and others, 2011) for the failure and breaching of glacial dam(s) and the deposition of the flood gravel. Flood gravel locally forms large bars about 5–8 m above present level of Arkansas River. Associated channel deposits inset into the flood gravel, some too small to show at map scale, consist chiefly of sand and granule- to cobble-size clasts deposited in channels and swales cut into the flood gravel. Flood boulders in the channel deposits are rare or absent. Channel deposits mark the former courses of the Arkansas River during the waning phase or slightly after the younger flood of the Pinedale glacia- tion. Unit Qpf locally may include deposits of outwash gravel of Pinedale glaciation (Qgp) that postdates deposition of unit Qpf and older flood gravel and channel deposits of Pinedale glaciation Qpfo. Top of unit Qpf is as much as about 9 m above the Arkansas River downstream of glacial dam on Clear Creek. Estimated thickness of flood- gravel deposits is >20 m near the source of the flood and thinner downstream; estimated thickness of associated channel deposits is as much as 2 m

Reference: Kellogg, K.S., R.R. Shroba, C.A. Ruleman, R.G. Bohannon, W.C. McIntosh, W.R. Premo, M.A. Cosca, R.J. Moscati, T.R. Brandt. Geologic map of the upper Arkansas River valley region, north-central Colorado. doi: 10.3133/sim3382. U.S. Geological Survey Scientific Investigations Map 3382. [186]

2.588 - 5.333 Ma

ID: 3186821
Cenozoic sedimentary rocks

Age: Pliocene (2.588 - 5.333 Ma)

Comments: Rio Grande Rift

Lithology: Sedimentary rocks

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

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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