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Ramsdell Mine (Ramsdell Manganese Mine; Gleeson Flat Mine; Gleeson Flat group), Picacho Colorado area, Salt River, Salt River District, Gila Co., Arizona, USA

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A former surface and underground Mn mine located in T5N, R16E, 2¾ miles WSW of Picacho Colorado (peak), within 1 mile E of the Salt River, 38 road miles N of Globe. NOTE: Alternate coordinates provided: 33.8336N, 110.5581W.

Mineralization is ore in stringers and lensing pods hosted in diorite. The ore zone is 76.2 meters long and 3.05 meters wide, strikes N-S and dips 80E. The quartz diorite is coarse-grained to porphyritic.

The workings consisted of 3 adits driven into the hillside. The upper workings are comprised of an open cut and adit extending southward.

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.


Wilson, E.D. and Butler, G.M. (1930), Arizona Bureau of Mines Bull. 127, Manganese Ore Deposits in Arizona: 60.

Farnham, L.L., Stewart, L.A., and Delong, C.W. (1961), Manganese Deposits of Eastern Arizona, US Bureau of Mines Information Circular 7990: 42, 85.

Arizona Department of Mineral Resources Ramsdell group file.

MRDS database Dep. ID #10027388, MRDS ID #M003010; and Dep. ID #10136622, MAS ID #0040070566; and Dep. ID #10282761, MRDS ID #D003608, MAS ID #0040070021.

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