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Comstock and Dexter Mine (Comstock-Dexter Mine), Butte Creek, Bagdad, Eureka District, Yavapai Co., Arizona, USA

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‡Ref.: Wilson, E.D., et al (1934). Arizona Lode Gold Mines & Gold Mining, Arizona Bureau of Mines Bull. 137: 25-26.

Metzger, O.H. (1938), Gold Mining and Milling in the Wickenburg Area, Maricopa and Yavapai Counties, Arizona: US Bureau of Mines Information Circular 6991: 72-73.

Wilson, E.D., et al (1950), Arizona zinc and lead deposits, part I, Arizona Bureau of Mines Bull. 156: 128.

Anderson, C.A., et al (1955), Geology and ore deposits of the Bagdad area, Yavapai County, Arizona, USGS PP 278: 47, 78, 89-92.

USGS Bagdad Quadrangle map.

Arizona Department of Mineral Resources Comstock and Dexter Mine file.

MRDS database Dep. ID #10027601, MRDS ID #M003483; and, Dep. ID #10137558, MAS ID #0040250531.

A former underground Au-Ag-Cu-Pb-Zn mine on 2 patented claims, on the Hillside fault, located on a tributary of Butte Creek about 1½ miles South of the Hillside Mine and more than 2 miles north of Bagdad. Started in the late 1880's and closed in 1933. The Comstock and Dexter patented claims have an area of 26 acres and are owned by the Comstock-Dexter Mines, Inc. (circa 1951). The Comstock claim was located on March 1, 1892, by Paul Dillon, J.F. Dillon, and Joseph Howell. The Dexter claim to the south was located on January 1, 1896 by L.J. Webber and relocated on May 19, 1896 by Jacob Reese. On November 29, 1907, the Comstock-Dexter claims were patented by A.C. Gilmore, W.W. White, and J.F. Dillon. Later John Lawler bought Mr. White's interest in this claim.

Mineralization is a vein deposit with ore in stringers and irregular bunches hosted in medium-massive gray schist (Hillside Mica Schist). The vein is a few inches to 1½ feet wide. Ore control was faulting and shearing. Ore control was oxidation at near surface. No alteration noted. North of the shaft the main vein splits into two veins having the same general strike and dip as the Hillside fault. The vein can be followed south of the shaft for 2,000 feet. An associated rock unit is the Lawler Peak Granite and quartz monzonite porphyry dikes.

Workings included a new 120 foot deep shaft and 500 feet of drifts on 2 adit levels. A total of some 4,000 feet of workings, chiefly drifts along the vein, were opened on 4 connecting levels. Production prior to 1901 was some $18,000 in Au & Ag (period values). 1938 production was 410 ounces of Au, 6,500 ounces of Ag, 1,363 pounds of Cu, and 8,080 pounds of Pb, having a total value of $19,058 (period values).

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