Spring Creek Mine (Yankee Dollar Mine; Old Mankins prospect), Brady Canyon, Spring Creek District, Gila Co., Arizona, USA
|Latitude & Longitude (WGS84):||34° 4' 37'' North , 111° 4' 32'' West|
|Latitude & Longitude (decimal):||34.07694,-111.07556|
|Köppen climate type:||Csa : Hot-summer Mediterranean climate|
|Other regions containing this locality:||Sonoran Desert, North America|
A former underground Au-Pb-Ag-Cu mine located in the NE¼SW¼ sec. 36, T9N, R12E, 9 miles S of Young, located in Brady Canyon, 1¼ miles SW of Mail Box Mesa, on National Forest land. Produced 1926-1931. The property was comprised of 12 unpatented claims in 1981. Owned by Mr. Lee Folks, Young, AZ, and Mr. Evart Bunger, Globe, AZ (1981). Operated by the Silver Bullet Co. of Young, AZ (1981). Past operators included John Carolan; M. McAuliffe; and Spring Creek Leasing. A Mr Mankins operated the mine for gold previous to 1926.
Mineralization is a vein deposit with ore in lenses, stringers, and mainly lenticular bodies, hosted in Precambrian Pinal Schist. The ore zone is 365.76 meters long, 0.91 meters wide, striking N60E, and dipping 80S to vertical. The vein ranges in size from stringers to 3 feet locally, but averages a few inches wide. Ore concentration was secondary mineralization and mesothermal from pyrite, chalcopyrite and galena.
Area structures include the scistosity of the Precambrian Pinal Schist, which generally trends N40-60E. The shcist is overlain by Scanlon Conglomerate about 100 feet thick. Unconformably above is a Tertiary basalt flow. South of the deposit is a mass of Precambrian quartz porphyry. Precambrian Apache Group is exposed in the region, but is missing near the mine. Veins are structurally undisturbed locally, although there may be a fault along Spring Creek.
1981 plans were to clean up old workings and produce ore from a small block.
2 valid minerals.
This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.
Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org
1600 - 1800 Ma
|Early Proterozoic metavolcanic rocks|
Age: Statherian (1600 - 1800 Ma)
Description: Weakly to strongly metamorphosed volcanic rocks. Protoliths include basalt, andesite, dacite, and rhyolite deposited as lava or tuff, related sedimentary rock, and shallow intrusive rock. These rocks, widely exposed in several belts in central Arizona, include metavolcanic rocks in the Yavapai and Tonto Basin supergroups. (1650 to 1800 Ma)
Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. 
U.S. Bureau of Mines - Arizona Bureau of Geology and Mining Technology file data.
Arizona Department of Mineral Resources Spring Creek Mine file.
USGS Buzzard Roost Mesa Quadrangle map.
MRDS database Dep. ID #10046309, MRDS ID #M241213; and Dep. ID #10185885, MAS ID #0040070634.
Yale Peabody GNIS database (NOTE: this database is derived from USGS 1:24,000 topographic map data).