Latitude: 34°28'26"N
Longitude: 112°24'6"W
‡Ref.: Yavapai Magazine (1918) July, 1918.
Lindgren, W. (1926), Ore deposits of the Jerome and Bradshaw Mountains quadrangles, Arizona, USGS Bull. 782: 113.
Wilson, E.D., et al (1934), Arizona Lode Gold Mines and Gold Mining. Arizona Bureau of Mines Bull. 137: 32-33.
Elsing, M.J. and Heineman, E.S. (1936) USGS Bulletin 140: 102.
U.S. Bureau of Mines - Arizona Bureau of Geology and Mining Technology file data.
USGS Groom Creek Quadrangle map.
U.S. Bureau of Land Management Mining District Sheet 227.
Arizona Department of Mineral Resources Midnight Test Mine file.
MRDS database Dep. ID #10026933, MRDS ID #M001128; and, Dep. ID #10113729, MAS ID #0040251406.
A former underground Au-Ag-Pb-Cu-Zn mine located high up near the Groom Creek - Walker divide on the NW slope of Spruce Mountain at 7,000 feet of altitude. Started about 1902 and produced until 1935. Owned by the National Gold Corp.
Mineralization is a near-surface small oreshoot rich in silver ore hosted in the Green Gulch Volcanics. The vein is 2 feet wide in schist and is irregular to lenticular and generally narrow comprised of coarse-grained, drusy quartz. Ore controlwas faulting, igneous activity (especially dike emplacement). Concentration was oxidation at near surface. The silicified schist is intruded by stocks & dikes of granodiorite and diorite.
Area structures include veins parallel to the foliation and crosscut it by 10-20 degrees, trending N20E to N-S. The foliation in Precambrian rocks trends N10E to N20E.
Workings include development to the 400 level with a shaft of that depth (before 1906) and to 600 feet deep by 1906. Production reported at $100,000 (period values).
Mineral List
7 entries listed. 6 valid minerals.
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