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Armer Wash Mine (Armer property; Sunset group; Sunset Mine; Patented claim MS 4310), Armer Wash, Dutchwoman Butte area, Sierra Ancha District, Sierra Ancha Mts, Gila Co., Arizona, USA

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A former surface and underground Mn-W-Fe mine located in sec. 29, T5N, R13E, about 3½ miles SE of Dutchwoman Butte, about 5 miles N of the eastern end of Theodore Roosevelt Lake, and 6 miles N of Roosevelt Creek. Produced 1953-1954. NOTE: Alternate coordinates provided: 33.7083N, 111.0361W.

Mineralization is an irregular ore body comprised of veinlets, seams, masses and blocks of ore hosted in the Dripping Springs Quartzite. The ore zone is 152.4 meters long, 18.29 meters wide, strikes N70W and dips 65NE. Ore control was the contact between limestone and quartzite. Limestone exists south of the mine workings. An associated rock unit is diabase.

The ore was mined from shaft workings and a few shallow opencuts. Additional exploratory work consisted of some bulldozer trenching. The workings are 19.81 meters in length and 12.19 meters deep.

Assay data: A grab sample contained 9.5% Mn, 3.0% Fe.

Mineral List

3 entries listed. 1 valid mineral.

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.


Hewett, D.F. & M. Fleischer (1960), Deposits of the manganese oxides, Economic Geology: 55: 1-55.

Farnham, L.L., Stewart, L.A., and Delong, C.W. (1961), Manganese Deposits of Eastern Arizona, US Bureau of Mines Information Circular 7990: 86-87.

Crittenden, M.D., et al (1962), Studies of manganese oxide minerals - VI. Thallium in some manganese oxides, American Mineralogist: 47: 1461-1467.

Lemmon, D.M., and Tweto, O.L. (1962) Tungsten in the U.S., USGS map, MR-25.

USGS & Arizona Bureau of Mines, and U.S. Bureau of Reclamation (1969), Mineral and Water Resources of Arizona, Arizona Bureau of Mines Bull. 180: 217.

Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd. ed.: 337-338.

U.S. Bureau of Mines file data - cluster 928 - Sunset Mine.

Arizona Department of Mineral Resources Sunset Manganese file.

USGS Windy Hill Quadrangle map.

U.S. Bureau of Land Management Mining District Sheet 150.

MRDS database Dep. ID #10027387, MRDS ID #M003009; and Dep. ID #10046300, MRDS ID #M241201; and Dep. ID #10090601, MRDS ID #D000760; and Dep. ID #10209938, MAS ID #0040070018; and Dep. ID #10282766, MAS ID #0040070646.

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