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Blodgett Mine (Blodgett prospect), Engesser Pass, Kofa Game Range, Tank Mountains District, Tank Mts, Yuma Co., Arizona, USA

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A surface Au-Cu prospect located in the center N½ sec. 33, T2S, R15W, on federal land. (Engesser Pass 15 minute topo map), 2 miles E of the Engessor Mine, in the NW Tank Mountains.

Mineralization is a small area of fissured granitic rock that emerges from beneath the lavas that make up the surrounding, rugged mass of the range. Ore is in narrow quartz-carbonate veins/stringers. Vein walls somewhat sericitized and silicified. The ore zone is 1.22 meters wide. Ore control was quartz-carbonate stringers in fine-grained granite. Tectonic influences include block faulting. Associated rock unit is the Kofa volcanics.

The granite has been deeply decayed so that its exposures now consist of quartz, chlorite, and kaolinized feldspar. The quartz, which is of yellowish-white colour, is locally honeycombed and contains many small bunches of brown to black iron oxide.

Workings comprise two shafts at 15 and 30 feet (9.14 meters) deep; and a shallow cut. No production record.

Mineral List

8 entries listed. 6 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. (1933) Geology and Mineral Deposits of Southern Yuma County, Arizona. Arizona Bureau of Mines Bulletin 134: 125-126.

Wilson, E.D., Cunningham, J.B., and Butler, G.M. (1934), Arizona Lode Gold Mines and Gold Mining (revised 1967), Arizona Bureau of Mines Bull. 137: 148.

Niemuth, N.J. & K.A. Phillips (1992), Copper Oxide Resources, Arizona Department of Mines & Mineral Resources Open File Report 92-10: 18 (Table 1).

MRDS database Dep. ID file #10027205, MRDS ID #M002468; and, Dep. ID #10259329, MAS ID #0040270120.

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