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Big Buck Mine (Standard), Casa Colorado Rock, Big Indian District (Big Indian Wash - Lisbon Valley Area), San Juan Co., Utah, USA

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Latitude & Longitude (WGS84): 38° 11' 15'' North , 109° 15' 29'' West
Latitude & Longitude (decimal): 38.1875, -109.258055556
A former Cu-Pb-U-V-Zn occurrence/mine located in the SE¼SE¼SW¼ sec. 11, T30S, R24E, SLM, 5.0 km (3.1 miles) ENE of Casa Colorado Rock, on Bureau of Land Management administered land (located claim). Discovered in 1954 by the Standard Uranium Corporation. First production was 1955. Owned by the Atlas Minerals Corporation, Utah (1974). MRDS database stated accuracy for this location is 10 meters.

Mineralization is a replacement deposit hosted in Late Permian Cutler Formation sandstone. The ore body is tabular, lenticular, podiform and irregular. It strikes N30W and dips 12W at a thickness of 3.1 meters and a depth-to-top of 90 meters, a width of 60 meters, and a length of 264 meters. It is lenticular. The primary ore control was bedding. Local rocks include Triassic and Jurassic sedimentary rocks in southeastern Utah. Discovered by drilling.

Regional geologic structures include a stable platform. Local features involve thicker portions of sandstone with enrichment along fractures.

Workings include underground openings with a length of 1,500 meters and an overall depth of 114.3 meters. The mining method was room and pillar.

Production data are found in: Utah Geological and Mining Survey (1973).

Reserve-Resource data are found in: Jones, H (1978).

Mineral List

13 entries listed. 13 valid minerals.

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.


Utah Geological and Mining Survey (1973).

Jones, H (1978).

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10015059 & 10227589.

U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0490370308.

U.S. Bureau of Mines product tabs (Washington).

UGMS Bull 117 Minerals and Mineral Localities of Utah.

Mineral and/or Locality is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization. Public Relations by Blytheweigh.
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