Big Chief Mine (Big Chief No. 3 & 4 claims), Boot Mesa, Monument Valley Mining District, Navajo Co., Arizona, USAi
|Regional Level Types|
|Big Chief Mine (Big Chief No. 3 & 4 claims)||Mine|
|Monument Valley Mining District||Mining District|
A former U occurrence/mine located in approximate SE¼ sec. 21, T4lN, R19E, G&SRM, about 6.0 km (3.7 miles) NNE of Boot Mesa (coordinates of record). The geographic coordinates presented are approximate for the SE corner of sec. 21.
Mineralization is an U deposit with uraninite in a paleochannel of Shinarump conglomerate.
Workings include underground openings with an incline entry.
Production was 32,534 tons of ore @ 0.23% U3O8 (1959-1961).
Analysis test results: 0.31% U3O8; 0.50% V2O5; 6.00% CaCO3 maximum.
Regions containing this locality
|North America Plate||Tectonic Plate|
|Colorado Plateau, USA||Plateau|
|Navajo Nation Indian Reservation, USA||Reservation|
|Hopi-Navajo Indian Reservations, Colorado Plateau, Apache; Navajo and San Juan Cos., Arizona & Utah, USA|
Select Mineral List TypeStandard Detailed Strunz Dana Chemical Elements
Commodity ListThis is a list of exploitable or exploited mineral commodities recorded at this locality.
2 valid minerals.
Rock Types Recorded
Select Rock List TypeAlphabetical List Tree Diagram
Detailed Mineral List:
| ⓘ Uraninite|
Reference: Scarborough, Robert B. (1981), Radioactive occurrences and uranium production in Arizona, Arizona Bureau of Geology and Mineral Technology Report for U.S. Department of Energy (Atomic Energy Commission), GJBX-143. RME-2071: 218.
| ⓘ Uranopilite|
Formula: (UO2)6(SO4)O2(OH)6 · 14H2O
Reference: Grant, Raymond W., Bideaux, R.A., and Williams, S.A. (2006) Minerals Added to the Arizona List 1995-2005: 9.
List of minerals arranged by Strunz 10th Edition classification
|Group 4 - Oxides and Hydroxides|
|Group 7 - Sulphates, Chromates, Molybdates and Tungstates|
|ⓘ||Uranopilite||7.EA.05||(UO2)6(SO4)O2(OH)6 · 14H2O|
List of minerals arranged by Dana 8th Edition classification
|Group 5 - OXIDES CONTAINING URANIUM OR THORIUM|
|Group 31 - HYDRATED SULFATES CONTAINING HYDROXYL OR HALOGEN|
|ⓘ||Uranopilite||22.214.171.124||(UO2)6(SO4)O2(OH)6 · 14H2O|
List of minerals for each chemical element
|H||ⓘ Uranopilite||(UO2)6(SO4)O2(OH)6 · 14H2O|
|O||ⓘ Uranopilite||(UO2)6(SO4)O2(OH)6 · 14H2O|
|S||ⓘ Uranopilite||(UO2)6(SO4)O2(OH)6 · 14H2O|
|U||ⓘ Uranopilite||(UO2)6(SO4)O2(OH)6 · 14H2O|
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 Macrostrat.org
|Holocene - Gelasian|
0 - 2.588 Ma
|Quaternary surficial deposits, undivided|
Age: Pleistocene (0 - 2.588 Ma)
Description: Unconsolidated to strongly consolidated alluvial and eolian deposits. This unit includes: coarse, poorly sorted alluvial fan and terrace deposits on middle and upper piedmonts and along large drainages; sand, silt and clay on alluvial plains and playas; and wind-blown sand deposits. (0-2 Ma)
Comments: Original map source: Arizona Geological Survey, DI-8 Geologic Map of Arizona, Digital Spatial data for the Geologic Map of Arizona, v. 3.0, edited by S.M. Richard and S.M. Kneale, 2002, 10 p., 2 DOS HD disks. Arc/INFO export file (.e00) format, scale 1:1,000,000.
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. 
|Early Jurassic - Late Triassic|
174.1 - 237 Ma
|Mesozoic sedimentary rocks|
Age: Mesozoic (174.1 - 237 Ma)
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.