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Monument No. 2 Mine, Monument No. 2 channel, Monument Valley, Navajo Indian Reservation, Apache Co., Arizona, USA

Tyuyamunite
Monument No. 2 Mine, Monument No. 2 channel, Monument Valley, Navajo Indian Reservation, Apache Co., Arizona, USA
Latitude: 36°55'42"N
Longitude: 109°55'6"W
A U-V mine with minor Cu-Mo-Pb-Fe, located in the Monument No. 2 channel (paleochannel), about 1 mile West of Comb Ridge and SE of Yazzie Mesa on the east limb of the Monument upwarp, in en echelon strike and slip vertical faults along the channel. Discovered by Luke Yazzie, a Navajo, in 1942 and started during 1945. Reopened in 1948. Sussequently owned by the Vanadium Corp. of America.

Mineralization is the Monument No. 2 channel, one of the richest U-V deposits in the Monument Valley area. It is a short channel comprised of medium-grained, massive sandstone. The channel strikes N.18ºW. and is about 1¾ miles long. It ranges in width in its central part from 400 feet to 700 feet and has been cut into the underlying strata with a depth of about 50 feet.

There are 4 types of orebodies: rods, tabular, corvusite-type and rolls. Rods are cylindrical bodies about 3 to 5 feet wide and 2 to 3 feet high and 15 to 20 feet long and are found only in the Shinarump member of the Chinle formation. The tabular orebodies are blanket-like masses composed of channel sediments impregnated with yellow U-V minerals. These are 40 to 50 feet long and range in width from 20 to 30 feet and 3 to 5 feet thick. The corvusite-type orebodies are irregularly shaped masses within which the rock is thoroughly penetrated by vanadium minerals. Rolls are similar bodies in the Morrison formation.

Mineral List

Antlerite
Autunite
Becquerelite
Bokite
Bornite
Calcite
Carnotite
Coffinite
Corvusite
Doloresite
Fernandinite
Fervanite
Fluorapatite
var: Carbonate-rich Fluorapatite

Fourmarierite
Galena
'Gummite'
Gypsum
var: Selenite
Hewettite
'Ilsemannite'
Jarosite
Kaolinite
'Limonite'
Metahewettite
Metarossite
Metatyuyamunite
Metazeunerite
Montmorillonite
Montroseite
Navajoite (TL)
Opal
var: Opal-AN
Paramontroseite
Pascoite
'Petrified Wood'
Pyrite
Quartz
'Rauvite'
Roscoelite
Schoepite
Schubnelite
Sphalerite
Steigerite
Straczekite
Sulphur
Tyuyamunite
Uraninite
Uranophane
'Uvanite'
Vandendriesscheite
Variscite
Vésigniéite
Volborthite
var: Barian Volborthite

'Wad
var: Lithian Wad'



54 entries listed. 43 valid minerals. 1 type locality (valid mineral).

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References

Gruner, J.W. & L. Gardiner (1952): Mineral association in the uranium deposits of the Colorado Plateau and adjacent regions with special emphasis on those in the Shinarump formation, part 3, Annual Report July 1, 1951 - June 30, 1952, US Atomic Energy Commission RMO 566. Technical Information Service, Oak Ridge, TN.

Rosenzweig, A., et al (1954): Widespread occurrence and character of uraninite in the Triassic and Jurassic sediments of the Colorado Plateau. Economic Geology. 49: 351-361.

Weeks, A.D., et al (1954): Navajoite, a new vanadium oxide from Arizona. Science, 119: 326.

Isachsen, Y.W., et al (1955): Age and sedimentary environment of uranium host rocks, Colorado Plateau. Econonomic Geology, 50: 127-134.

Mitcham, T.W. & C.G. Evensen (1955): Uranium ore guides, Monument Valley district, Arizona. Economic Geology, 50: 170-176.

Weeks, A.D., et al (1955): Navajoite, a new vanadium oxide from Arizona. American Mineralogist, 40: 207-212.

Wright, R.J. (1955): Ore controls in sandstone uranium deposits of the Colorado Plateau. Economic Geology, 50: 135-155.

Frondel, C. (1956): Mineral composition of gummite. American Mineralogist, 41: 539-568.

Finnell, T.L. (1957): Structural control of uranium ore at the Monument No. 2 mine, Apache Co., AZ. Econonomic Geology, 52: 25-35.

Stern, T.W. et al (1957): Doloresite, a new vanadium oxide mineral from the Colorado Plateau. American Mineralogist, 42: 587-593.

Evensen, C.G. & I.B. Gray (1958): Evaluation of uranium ore guides, Monument Valley, AZ and UT. Econ. Geol., 53: 639-662.

Frondel, C. (1958): Systematic mineralogy of uranium and thorium. USGS Bull. 1064: 68, 78, 91, 220, 253, 264.

Jensen, M.L. (1958): Sulphur isotopes and the origin of sandstone-type uranium deposits.Economic Geology,53: 598-616.

New Mexico Geol Soc. 24th. Guidebook;

Brennan (1959): Minerals of Arizona: 34, 35, 36, 75, 77, 78, 79, 104.

Ross, M. (1959):Mineralogical applications of electron diffraction.II. Studies of some vanadium minerals of the Colorado Plateau. American Mineralogist,44: 322-341.

Witkind, I.J. & R.E. Thaden (1963): Geology and uranium-vanadium deposits of the Monument Valley area, Apache and Navajo Counties, Arizona: 68-69, 95, 105-129.

Young, R.G. (1964): Distribution of uranium deposits in the White Canyon-Monument Valley district, UT-AZ. Econ.Geol.,: 59: 850-973.

Johnson, H.S. (1966), Uranium deposits of the Moab, Monticello, White Canyon and Monument Valley District, Utah and Arizona, USGS Bull. 1222-H.

Galbraith, F.W. & D.J. Peirce, W.H. (1970), Coal, oil, natural gas, helium, and uranium in Arizona, AZ Bur. Mines Bull. 182: 235-248.

Rocks & Minerals (1989): 64: 500.

Evans, H. and J. Hughes (1990) Crystal chemistry of the natural vanadium bronzes. American Mineralogist: 75: 508-521.

Haynes, P. (1991), Arizona News, Mineral News: Jan: 9.

Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd. ed.: 115, 116, 124, 131, 140, 154, 155, 181, 189, 207, 220, 222, 226, 241, 250, 258, 261, 265, 294, 295, 296, 297, 304, 311, 321, 323, 352, 357, 364, 365, 380, 386, 406, 407, 408, 411, 412, 414, 415.

Grant, Raymond W., Bideaux, R.A., and Williams, S.A. (2006) Minerals Added to the Arizona List 1995-2005: 8.

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