Silver Bell Mine (Silver Bill Mine), Washington Camp-Duquesne District, Patagonia District, Patagonia Mts, Santa Cruz Co., Arizona, USA
|Latitude & Longitude (WGS84):||31° 21' 56'' North , 110° 41' 32'' West|
|Latitude & Longitude (decimal):||31.36556,-110.69222|
|Other regions containing this locality:||Sonoran Desert, North America|
|Köppen climate type:||BSk : Cold semi-arid (steppe) climate|
A former underground Zn-Pb-Cu-Ag-Au mine located in the SE ¼ sec. 3, T24S, R16E (protracted), in the southwestern part of the camp, at an elevation of about 5,220 feet, and almost adjoins the Belmont Mine on the NE, on National Forest land. Owned at times, or in part, by the Duquesne Mining & Reduction Co. (1901- ); and, Nash Mines. NOTE: Anthony, et al, refer to a Silver Bill Mine, which is an apparent typographical error for this mine.
Mineralization is irregular lenses containing sulfides with calcium silicates in pyrometamorphosed Permian Naco Group limestone. Oxidized with strong iron oxides and some copper carbonates near the surface. Abundant garnet. Mineralization is controlled by faults and contact with Laramide granodiorite.
Mineral deposits of the Washington-Duquesne area occupy a limestone-sediment belt (2.5 miles long by 1.25 miles wide) surrounded by igneous rocks which also form detached masses and dikes within the belt.
The deposit occurs in a garnet zone contained in highly metamorphosed crystalline limestone. The limestone dips to the SW and, as at the Holland Mine, is cut transversely by a sheeting that dips to the NE. The mineralized zone trends N.40ºW. and dips 45 or 50ºSW., conformably with the limestone.
Workings include a 60 foot deep shaft, that inclines 50º to 60º SW, and tunnel operations. Rich Pb-Ag ore was mined from the surface in the late 1800's and some mining occurred in the 1900's. Production would be some 500 tons of ore averaging about 5% Zn, 4% Pb, 1% Cu and 3 oz. Ag/T.
6 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
66 - 145 Ma
|Mesozoic sedimentary rocks|
Age: Cretaceous (66 - 145 Ma)
Lithology: Sedimentary rocks
Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. 
|Kungurian - Moscovian|
272.3 - 315.2 Ma
|Permian to Pennsylvanian sedimentary rocks|
Age: Paleozoic (272.3 - 315.2 Ma)
Stratigraphic Name: Hermit Formation; Supai Group; Schnebly Hill Formation; Naco Group
Description: Interbedded sandstone, shale, and limestone usually characterized by ledgy outcrops. Orange to reddish sandstone forms cliffs near Sedona. This unit includes Supai Group and Hermit Shale in northern Arizona and Naco Group in southern Arizona. It was deposited in coastal-plain to shallow-marine settings during time of variable and changing sea level. Rocks of this map unit in southern Arizona may be in part equivalent to Permian rocks of map unit P in central and northern Arizona. (280-310 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.