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El Oso Mine (New Discovery Mine; Harrison Mine), El Oso group of claims, Jolene Mine (Cline Mine/claims; Jolene group; El Oso properties; Mazatzal group; Blue Bull Mine), Pine Mountain area, Mazatzal West District, Mazatzal Mts, Gila Co., Arizona, USA

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A former surface and underground W-Mo mine located in sec. 19, T5N, R10E, about 1 mile NE of Pine Mountain and about 5½ miles NW of Four Peaks, on the crest of the Mazatzal Mountains 6 miles W of the N end of Theodore Roosevelt Lake, on National Forest land. Discovered in 1941 by E.R., P.J., & H.G. Harrison and Bern Swensk. Also entends into Maricopa County. Owned by Mr. Marvin Harrison of Fresno, California (1961).

Mineralization is a vein deposit with a linear ore body hosted in pegmatite. The ore zone is 9.14 meters long and 1.52 meters wide, striking N75W and S24E, and dipping N and W. Ore control was steep fissures intruded by aplite or pegmatite dikes.

Area structures include granite cut by a mile wide belt of granite porphyry.

Workings are 121. 92 meters long and 3.05 meters deep.

Mineral List

6 entries listed. 4 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.


Wilson, E.D. (1941), Tungsten Deposits of Arizona. Arizona Bureau of Mines Bull. 148: 31.

Dale, V.B. (1961), Tungsten Deposits of Gila, Yavapai, and Mohave Counties, Arizona, US Bureau of Mines Information Circular 8078.

MRDS database Dep. ID #10027337, MRDS ID #M002890.

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