|Latitude & Longitude (WGS84):||31° 40' 57'' North , 111° 16' 54'' West|
|Latitude & Longitude (decimal):||31.68250,-111.28167|
|Other regions containing this locality:||Sonoran Desert, North America|
|Köppen climate type:||BSk : Cold semi-arid (steppe) climate|
Ref.: Jones, R.D. (1957) Geology of the Cerro Colorado mining district, Pima County, Arizona: Tucson, University of Arizona, M.S. thesis, 59 p., 2 sheets, scale 1:14,080.
Jones, R.D. (1957) Geology of the Cerro Colorado mining district, Pima County, Arizona [abs.]: Arizona Geological Society Digest: 1: 42-43.
Keith, Stanton B. (1974), Arizona Bureau of Geology & Mineral Technology, Geological Survey Branch Bull. 189, Index of Mining Properties in Pima County, Arizona: 113 (Table 4).
Arizona Bureau of Mines file data.
MRDS database Dep. ID file #10039561, MRDS ID #M050284; and, Dep. ID #10137977, MAS ID #0040190131.
A former small surface and underground Ag-Au-Pb-Cu mine located in the SE ¼ sec. 14, T.20S., R.10E., 8 miles NNW of Arivaca. Owned by Udall. Operated by Soloman & Woatman (1935).
Mineralization is spotty primary and secondary lead minerals and minor copper carbonates in an oxidized and supergene enriched quartz-fissure zone in Cretaceous andesite porphyry. Depth to bottom of ore is 21.34 meters, the ore body strikes N85E and dips 75SE.
Workings include a shallow shaft and surface operations to 24.38 meters deep. Worked sporadically from the early 1800's to 1939. Some 100 tons of ore were produced, averaging about 20 oz. Ag/T, 0.2 oz. Au/T, with minor Pb & Cu.
3 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
|Quaternary - Miocene|
0 - 23.03 Ma
|Cenozoic sedimentary rocks|
Age: Cenozoic (0 - 23.03 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. 
|Campanian - Oxfordian|
72.1 - 163.5 Ma
|Cretaceous to Late Jurassic sedimentary rocks with minor volcanic rocks|
Age: Mesozoic (72.1 - 163.5 Ma)
Stratigraphic Name: Temporal Formation; Bathtub Formation; Sand Wells Formation; Fort Crittenden Formation; McCoy Mountains Formation
Description: Sandstone and conglomerate, rarely forms prominent outcrops; massive conglomerate is typical near base of unit and locally in upper part. These deposits are nonmarine except in southeastern Arizona, where prominent gray marine limestone (Mural Limestone) forms the middle of the Bisbee Group. Sandstones are typically medium-bedded, drab brown, lithic-feldspathic arenites. Includes Bisbee Group (largely Early Cretaceous) and related rocks, Temporal, Bathtub, and Sand Wells formations, rocks of Gu Achi, McCoy Mountains Formation, and Upper Cretaceous Fort Crittenden Formation and equivalent rocks. (80-160 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.